Before mitosis begins, what happens during S-phase?
Answers
Answer:
the S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. in this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.
in S phase, the cell synthesizes a complete copy of the DNA in its nucleus. it also duplicates a microtubule-organizing structure called the centrosome. the centrosomes help separate DNA during M phase.
Explanation:
Related Questions
Which best describes a gene?
A. A sister chromatid
B. A piece of chromosome
C. A tetrad
D. A chromosome
Answers
A piece of chromosome is best describes a gene.
What are the functions of gene?The Mendelian gene is a basic unit of heredity and the molecular gene is a sequence of nucleotides in DNA that is transcribed to produce a functional RNA. There are two types of molecular genes: protein-coding genes and noncoding genes.
A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins.
Genes carry instructions that tell your cells how to work and grow. Cells are the building blocks of the body. Every part of your body is made up of billions of cells working together. Genes are arranged in structures called chromosomes.
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40 Points!!! Answer ASAP!!
1. Why is the energy industry looking for new ways to access oil and natural gas? Write at least two sentences to explain this trend.
2. Name three of the newer methods for accessing oil and natural gas. After each, write a sentence explaining how the method works. Finally, list at least one upside and one downside of each method.
Answers
Answer:
you didn't give 40 points
Answer:
yes
Explanation:
1/. In the________(LYTIC PATHWAY / LYSOGENIC PATHWAY) of bacteriophages, the virus initiates its replication process and eventually produces enough viral particles to cause its host cell to burst. In the _________(LYSOGENIC PATHWAY/ LYTIC PATHWAY) of bacteriophages, viral DNA is integrated into the host's chromosome and replicates with the host until the integrated DNA is reactivated and viral particle replication initiates.
2/. Of the protists, cells of a________(unicellular organism / multicellular organism / colonial organism) live together and behave together in an integrated fashion, but remain self-sufficient. In comparison, the cells of a________(unicellular organism / multicellular organism / colonial organism) have a division of labor and rely on one another for survival.
3/. Binary fission is a prokaryotic mechanism of ______(sexual / asexual) reproduction that yields two equal-sized,_________(genetically distinct / genetically identical) descendant cells.
4/. The experiments of Stanley Miller and Harold Urey tested whether ________(heat / LIGHT / electricity ) could trigger the formation of simple organic compounds from _________(a mixture of gases mimicking the modern Earth atmosphere / a mixture of complex organic compounds / a mixture of gases mimicking the early Earth atmosphere)
Answers
In the LYTIC PATHWAY of bacteriophages, the virus initiates its replication process and eventually produces enough viral particles to cause its host cell to burst.
In the LYSOGENIC PATHWAY of bacteriophages, viral DNA is integrated into the host's chromosome and replicates with the host until the integrated DNA is reactivated and viral particle replication initiates.
Of the protists, cells of a COLONIAL ORGANISM live together and behave together in an integrated fashion, but remain self-sufficient. In comparison, the cells of a MULTICELLULAR ORGANISM have a division of labor and rely on one another for survival.
Binary fission is a prokaryotic mechanism of ASEXUAL reproduction that yields two equal-sized, GENETICALLY IDENTICAL descendant cells.
The experiments of Stanley Miller and Harold Urey tested whether ELECTRICITY could trigger the formation of simple organic compounds from A MIXTURE OF GASES MIMICKING THE EARLY EARTH ATMOSPHERE.
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Which fuel does the circulation of blood provide for cellular respiration and healing?
A. oxygen
B. protein
C. iron
D. ATP
Answers
Answer:
A. Oxygen
Explanation:
During cellular respiration the cell uses oxygen to break down sugar. When sugar breaks down it produces energy in which your body needs. Blood picks up oxygen and releses carbon dioxide into your lungs.
Hope this helps!!
The fuel responsible for the circulation of blood is oxygen.
It is very important for blood circulation to occur in the body. This is very essential so that all the cells and organisms are sufficiently funded with enough oxygen that is needed for them to function properly.
The fuel which enables proper amount of blood to spread/circulate round the body is oxygen. Oxygen is required during cellular respiration to break down sugar which then leads to the production of carbon dioxide and then releases energy for the body to work well.
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Describing Cause and Effect Select the question mark. Choose the cause that brings about the effect. option a: the chicks hide in tall grass. b: not much grass grows on the nesting grounds. c: the chicks parents bring him good. d: the gray chick hatches.
Answers
Answer:
Cause: Not much grass grows on the nesting grounds
Effect: Some Arctic tern chicks have nowhere to hide
Select the effect of climate change that decribe a diruption in ecological procee
Answers
The early animal mating and flower blossoming times are caused by climate change, which disrupts natural systems.
Numerous challenges to wildlife have been brought on by climate change in all of our parks. Due to changes that result in less food, less successful reproduction, and interference with the environment for local wildlife, rising temperatures reduce the survival rates of many species. The life cycles of plants and animals are also impacted by climate change. For instance, many plants are beginning to grow and bloom earlier in the spring as temperatures rise and to live longer into the fall. There are also some species that emerge from hibernation earlier or migrate at different times.
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a chemical compound, regardless of its source, that is capable of killing or inhibiting microorganisms is referred to as
Answers
A chemical compound, regardless of its source, that is capable of killing or inhibiting microorganisms is referred to as disinfectant
Disinfectants are used in a variety of ways to reduce the spread of disease, including cleaning and sterilizing surfaces, equipment, and medical instruments. Disinfectants can be found in many forms, such as liquids, powders, sprays, and aerosols.
They work by either killing the microorganisms directly or inhibiting their growth. Disinfectants are commonly used in hospitals, clinics, and other medical facilities to reduce the risk of infection. They can also be used in homes and workplaces to reduce the risk of the spread of germs and bacteria.
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which protein, acting as a hormone, regulates blood glucose? a. insulin b. thyroxine c. antidiuretic d. oxytocin e. prolactin
Answers
The protein acting as a hormone that regulates blood glucose is a) insulin.
Insulin is a hormone produced by the beta cells of the pancreas and plays a crucial role in regulating blood glucose levels. When blood glucose levels rise, such as after a meal, insulin is released into the bloodstream. Insulin acts on various tissues, particularly the liver, muscle, and adipose (fat) cells, promoting the uptake and storage of glucose. It helps lower blood glucose levels by facilitating the movement of glucose from the bloodstream into these cells, where it is either used for energy or stored as glycogen.
Insulin also suppresses the production of glucose by the liver. In individuals with diabetes, either insufficient insulin is produced (type 1 diabetes) or the body's cells become resistant to the effects of insulin (type 2 diabetes), leading to elevated blood glucose levels. Insulin therapy or other treatments are used to manage and control blood glucose in individuals with diabetes.
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Comparing Asexual and Sexual reproduction
Answers
Asexual reproduction involves one parent and produces offspring that are genetically identical to each other and to the parent. Sexual reproduction involves two parents and produces offspring that are genetically unique.
Explanation:
Which of the following is a source of carbon and amino acids during bacterial growth?
Answers
Carbon and amino acids are essential for bacterial growth therefore the correct option is A.
Carbon is needed for energy product and for the conflation of biomass, while amino acids are necessary for the product of proteins. The primary sources of carbon and amino acids for bacteria are organic composites from the environment. These composites can be attained from the terrain through ingestion, immersion, or application of waste products.
exemplifications of carbon sources include carbohydrates, similar as glucose, and organic acids, like acetate. Amino acids can be attained from proteins and peptides in the environment. Bacteria can also use inorganic sources of carbon, similar as carbon dioxide and bicarbonate, but they're much less effective at exercising these sources.
Hence the correct option is A.
Question is incomplete the complete question is
Which of the following is a source of carbon and amino acids during bacterial growth?
a. Carbon and amino acids
b. Only amino acids
c. Carbon only
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Choose the correct and best answer. Please state reason for the answer.
You have learned that in the genetic modification of bacterial cells and plants, the gene of interest must be inserted into a vector DNA, usually a bacterial plasmid. In a reaction vessel containing restriction enzymes, you have mixed multiple copies of the gene of interest and plasmid. However, upon checking, no recombinant DNA is formed. Which of the following statements correctly concludes the experiment?
a. An enzyme is needed to insert the gene of interest into the plasmid.
b. An enzyme is needed to destroy the ends of the gene of interest like the plasmid.
c. An enzyme is needed to synthesize a copy of the gene of interest into the plasmid.
d. An enzyme is needed to synthesize a copy of the plasmid adjacent to the gene of interest.
Answers
The statements correctly conclude the experiment of the genetic modification of bacterial cells and plants and upon checking, no recombinant DNA is formed if an enzyme is needed to synthesize a copy of the gene of interest into the plasmid (Option C).
The genetic modification of bacterial cells and plants involve the insertion of the gene of interest into the vector DNA, which is usually a bacterial plasmid. This is achieved through the use of restriction enzymes. However, when multiple copies of the gene of interest and plasmid are mixed in a reaction vessel and no recombinant DNA is formed, it is an indication that an enzyme is needed to synthesize a copy of the gene of interest into the plasmid.
There are different types of enzymes that can be used to accomplish this process, such as DNA polymerase or reverse transcriptase. DNA polymerase is an enzyme that synthesizes new DNA strands that are complementary to a template DNA strand, while reverse transcriptase is an enzyme that synthesizes a DNA strand using an RNA template.
In conclusion, to produce recombinant DNA, an enzyme is needed to synthesize a copy of the gene of interest into the plasmid. This is necessary for the genetic modification of bacterial cells and plants.
Thus, the correct option is C.
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PLEASE HELP!!! ITS DUE AT IN 30 MINUTES
Answers
Answer:
I believe the answer is D
Explanation:
what is the substance that makes up the cell wall
Answers
The cell wall is composed of a network of cellulose microfibrils and cross-linking glycans embedded in a highly cross-linked matrix of pectin polysaccharides
Cellulose, hemicellulose, polysaccharides and pectic substances
Which environmental group is most closely associated with mountain climbing, backpacking, and camping? A. Environmental Defense Fund B. Greenpeace C. Sierra Club D. World Wildlife Fund
Answers
The environmental group is most closely associated with mountain climbing, backpacking is Sierra Club, option (C) is correct.
The Sierra Club is most closely associated with mountain climbing, backpacking, and camping. Founded in 1892, the Sierra Club is one of the oldest and largest environmental organizations in the United States. It has a long history of promoting outdoor recreational activities and conservation efforts in natural landscapes, particularly in mountainous regions.
The club's members and supporters actively engage in activities such as hiking, backpacking, and camping, often in environmentally sensitive areas. The Sierra Club advocates for the protection of wilderness areas, preservation of ecosystems, and sustainable outdoor recreation practices. Through its outings programs and conservation campaigns, the Sierra Club encourages people to connect with nature, experience the beauty of mountains, and develop a sense of stewardship towards the environment, option (C) is correct.
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which of the following best describes a DNA molecule
Answers
Answer:
A. double helix.
Explanation:
what type of star is an example of a massive star?
Answers
Answer:
The largest known star is UY Scuti, a hypergiant with a radius somewhere around 1,700 times larger than the sun. Its mass, however, is only 30 times that of our nearest star. If R136a1 swapped places with the sun, it would outshine our closest star as much as the sun currently outshines the moon.
Explanation:
please give me a heart
Researchers collected data about the heart rates of humans aged 5 to 90 years. They represented the data in a graph. Simple correlation graph Which statement is the best explanation of the pattern in the data? A. The data show cause but not correlation between age and heart rate. B. The data show neither correlation nor cause between age and heart rate. C. The data show a correlation between age and heart rate. D. The data show that increasing age causes an increase in heart rate.
Answers
Scatter plots express the correlation between variables, if there is one, through the pattern of points. If there is a correlation, it can be positive or negative. C) The data show a correlation between age and heart rate.
What is the scatter plot?A scatter plot is a graphic tool that represents the existing relationship between two variables.
This representation is set in a cartesian graph, placing one of the variables on the horizontal axis and the other variable on the vertical axis.
The pattern of points intersection can show the relationship between the two variables.
Directly proportional relationship ⇒ while one of the variable values increases, the other variable values increase as well.- High positive correlation ⇒ points are too close to each other
- Low positive correlation ⇒ points are separated from each other
Inversely proportional relationship ⇒ as one of the values of the variables increases the values of other variable decreases.- High negative correlation ⇒ points are too close to each other
- Low negative correlation ⇒ points are separated from each other
No relationship ⇒ There is no tendency in the dispersion of the points. There is a homogeneous cloud. No correlation can be established between variables.Variables in the exposed example are,
Independent variable ⇒ heart rateDependent variable ⇒ AgeWe can see that the older the person is, the fewer beats per minute they express. On the contrary, the younger the person is, the more beats per minute are recorded.
This is a high negative correlation in which points are too close to each other.
Options,
A. The data show cause but not correlation between age and heart rate. Not correct. Data shows a clear correlation between variables.
B. The data show neither correlation nor cause between age and heart rate.
Not correct. Data shows a clear correlation between variables.
C. The data show a correlation between age and heart rate.
Correct. There is a negative correlation between variables.
D. The data show that increasing age causes an increase in heart rate.
Not correct. The older the person is, the fewer heart beats per minute.
Statement C is the best explanation of the pattern in the data. The data show a correlation between age and heart rate.
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how was ibrahim able to confirm that spinosaurus was the largest carnivore to ever walk the earth
Answers
Ibrahim was able to confirm that Spinosaurus was the largest carnivore to ever walk the earth from the Spinosaurus fossils that are present in Option A, from looking at the fossils and its skull, teeth, and limb bones, and from all these they say about the structure of the organism.
What is a fossil?This fossil of Spinosaurus has a long snout and conical teeth that were well-suited for catching fish, and along with this computer modeling to reconstruct the Spinosaurus skeleton, that was able to provide information about the length of the Spinosaurus fossil.
Hence, Ibrahim was able to confirm that Spinosaurus was the largest carnivore to ever walk the earth from the Spinosaurus fossils that are present in Option A.
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The question is incomplete, complete question is below
how was ibrahim able to confirm that spinosaurus was the largest carnivore to ever walk the earth
A)fossil
B)embryo
most taste buds are made of __________ types of modified epithelial cells.
Answers
Most taste buds are made of three types of modified epithelial cells: gustatory receptor cells, supporting cells, and basal cells. Gustatory receptor cells are the primary cells that detect tastes. These cells have hair-like projections called microvilli that extend into the taste pore and detect chemicals in the food. Supporting cells surround the receptor cells and provide structural support and insulation.
They also play a role in maintaining the sensitivity of the receptor cells. Basal cells are immature cells that can differentiate into gustatory receptor or supporting cells to replace damaged or dead cells. Taste buds are found on the tongue, soft palate, and the back of the throat. They work together with the sense of smell to create the perception of taste. The human tongue can distinguish between five basic tastes: sweet, sour, salty, bitter, and umami. The complexity and variety of flavors that we experience are due to the combination and interaction of these five basic tastes.
These cells work together to help us perceive and differentiate various tastes, such as sweet, salty, sour, bitter, and umami. Overall, the interaction of these modified epithelial cells in taste buds plays a crucial role in our ability to enjoy and recognize different flavors in our food.
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GIVING BRAINLIEST!! PLS HELP!!!!
Which of these is a behavioral adaptation?
A) An anteater has a very long tongue to help it eat catch and eat ants.
B) An artic fox has white fur which helps it blend into the snow.
C) A mouse has 3–14 offspring at a time to increase the number that survive.
D) A brown bear hibernates and becomes inactive during winter.
Answers
Answer:
your answer is c
Explanation:
its d trust me! :) i got it right on my test for flvs and its confirmed on a different question
Which statement describes the relationship between humans and renewable and nonrenewable energy
resources? (1 point)
O Humans use both types of resources to replace natural forms of energy.
O Humans use both types of resources to preserve the planet's environment.
O Humans use both types of resources to restore damaged natural ecosystems.
O Humans use both types of resources to support life's daily activities.
I need help please is you have the quick check
Answers
The statement that describes the relationship between humans and renewable and nonrenewable energy resources is: "Humans use both types of resources to support life's daily activities." Hence option D is correct.
Renewable energy resources, such as solar, wind, hydro, geothermal, and biomass energy, are sources of energy that can be replenished naturally and are considered more sustainable in the long term. Nonrenewable energy resources, such as fossil fuels (oil, coal, natural gas), nuclear energy, and other non-renewable sources, are finite and will eventually run out.
Humans use both renewable and nonrenewable energy resources to power their daily activities, from transportation and heating to lighting and electricity. However, there is a growing effort to transition towards more renewable energy sources to reduce dependence on nonrenewable resources, which have negative environmental impacts such as air pollution and greenhouse gas emissions.
Hence option D is correct.
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Someone plz help me :(
Answers
Answer:
C and B i think. sorry if its wrong
Explanation:
B and C
this anwser is basically just the x and y axis (which make a line graph)
I hope this is right! good luck :)
What happens to the pressure of a gas if the volume of gas is
increased at a constant temperature?
Answers
Answer: If the volume of a gas is increased at a constant temperature, the pressure of the gas decreases.
Explanation:
The relation between variation in volume and variation in pressure of a gas at a constant temperature is given by Boyle's Law which states that: The product of pressure and volume of a mass of a contained gas is constant at a constant temperature.
That is,
Pressure (P) x Volume (V) = constant (k)
[when the temperature (T) is constant; k ≠ 0.]
Or, P = \(\frac{k}{V}\)
That is, pressure varies inversely with volume or an increase in volume at a constant temperature causes a decrease in the pressure of the gas.
Detailed answer:
Gas molecules are always in random motion, and the pressure of a gas is defined as the pressure exerted by these moving gas molecules on the walls of the container as they undergo collisions with the walls of the container. The volume of a gas is defined as the three-dimensional space occupied by all the gas molecules in the container at a particular temperature and pressure. Thus, when the volume increases keeping the temperature constant (thus no change in kinetic energy of the molecules occurs due to temperature), the molecules get more space to move around. Thus the pressure exerted by the molecules on the walls of the container decreases.What does the evidence from the fossil record show?.
Answers
The evidence from the fossil record show important events and species in the appropriate geologic era.
A species is a taxonomic rank in biology that serves as the basis for classification and as a gauge of an organism's biodiversity. A species is generally defined as the largest collection of sexually reproducing organisms, where any two individuals of the appropriate sexes or mating types can produce fertile offspring. Another way to distinguish between species is through the karyotype, DNA sequence, anatomy, behavior, and ecological niche. Paleontologists also use the chrono species theory because it is unable to analyze fossil reproduction.
There are between 8 and 8.7 million different species of eukaryotes, according to the most recent reliable estimate. In contrast, just 14% of these have been described by 2011.
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Active transport requires _E_ __ __ __ __ __ to move molecules across
Answers
Answer:
Cellular Energy
Explanation:
Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration. Cellular energy is required to acheive this movement.
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The cell wall makes plant stems and trees very rigid and gives them structure. This would be similar to which of our body systems? A. Muscular B. Skeletal C. Endocrine D. Nervous system
Answers
Answer:
B. Skeletal
Explanation:
The cell wall could be represented as the bones in our body.
Datura stramonium (the Jimsonweed) expresses flower colors of purple and white and pod textures of smooth and spiny. The results of two crosses in which the parents were not necessarily true breeding are shown at the top of the next column. white spiny X white spiny → 3/4 white spiny: 1/4 white smooth purple smooth X purple smooth → 3/4 purple smooth: 1/4 white smooth (a) Based on these results, put forward a hypothesis for the inheritance of the purple/white and smooth/spiny traits. (b) Assuming that true-breeding strains of all combinations of traits are available, what single cross could you execute and carry to an F2 generation that will prove or disprove your hypothesis? Assuming your hypothesis is correct, what results of this cross will support it?
Answers
(a) The purple/white trait and the smooth/spiny trait are both controlled by single genes with dominant and recessive alleles. (b) Cross a white spiny plant with a purple smooth plant, and the F2 generation should produce a 9:3:3:1 ratio of white spiny, white smooth, purple spiny, and purple smooth plants, which would support the hypothesis.
(a) The results of the two crosses suggest that both the flower color and the pod texture traits are controlled by single genes, each with two different alleles. For the flower color trait, purple is dominant over white, and for the pod texture trait, smooth is dominant over spiny.
(b) To test this hypothesis, we could perform a dihybrid cross between a true-breeding white spiny plant and a true-breeding purple smooth plant. The F1 generation would be heterozygous for both traits (WwSs). When these plants are crossed to produce an F2 generation, we would expect to see a phenotypic ratio of 9:3:3:1.
This ratio means that 9/16 of the offspring will have both dominant traits (purple smooth), 3/16 will have one dominant and one recessive trait (either white smooth or purple spiny), and 1/16 will have both recessive traits (white spiny). If the observed ratio is close to 9:3:3:1, then it would support our hypothesis.
However, if the ratio is significantly different, it would suggest that there is something more complex going on with the inheritance of these traits, such as the presence of multiple genes or interactions between genes.
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3. Consider the statement: "An individual with two normal copies of the hemoglobin gene is said to
be
Which of the following phrases could fill in the blank to make the statement true?
Write "yes" or "no" next to each possible response.
Answers
Answer:
C IS THE ANSWER
Explanation:
YOU MUST ANSWER C
The total points scored in a basketball game can be calculated using the expression 3c + 3.
If c = 41, how many points total were scored?
points
Answers
In the expression with the given value of c, which is 41, we find that the total points scored in the game is 126.
To calculate the total points scored in the basketball game, we substitute the value of c, which is 41, into the expression 3c + 3.
By substituting c = 41 into the expression, we have:
3(41) + 3 = 123 + 3 = 126
Therefore, the total points scored in the basketball game is 126.
The expression 3c + 3 represents the number of points scored in the game. The term 3c represents the points scored per basket, where c represents the number of successful baskets. The Coefficient 3 indicates that each basket contributes 3 points to the total score. The constant term 3 represents any additional points, such as free throws or penalties, that are added to the total score.
By evaluating the expression with the given value of c, which is 41, we find that the total points scored in the game is 126.
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In meiosis II, _____. View Available Hint(s) In meiosis II, _____. chromosomes cross over to exchange genetic information chromosome number is reduced from diploid to haploid homologous chromosomes pair to ensure their even distribution to daughter cells sister chromatids are separated
Answers
Answer:
The correct answer is - sister chromatids are separated.
Explanation:
Meiosis is divided in two parts meiosis I and meiosis II. In the later part that is meiosis II is characterized by forming four haploid gametes by separating the sister chromatids in the two daughter cell.
Crossing over takes place in meiosis I that leads to recombination and reduces the chromosome number from diploid to haploid homologous chromosomes and then enters into meiosis II.