Why is the sickle cell allele still common in tropical regions?
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Related Questions
answer pls 100 points
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Answer:
Hydroxyl: -OH, alcohol
Carboxyl: -COOH, carboxylic acid
Amino: -NH₂, amine
Phosphate: -PO₄, phosphate group*
Carbonyl: -CO, aldehyde or ketone
Sulfhydryl: -SH, thiol
*I have no idea what class of compound this would be. they are normally just referred to as phosphate groups.
**note that all of these groups are attached to a carbon
Answer:
This isn't a hundred points
Explanation:
bacteria use this form of reproduction
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Answer:
Bacteria reproduce by binary fission. In this process, the bacteria, which is a single cell, divides into two identical daughter cells.
Explanation:
Bacteria reproduce by binary fission. In this process the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates).
according to the selection from an invisible thread, what main effect does maurice believe laura has had on him?
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Maurice believes that Laura has had a positive and transformative effect on him.
In the selection from "An Invisible Thread," Maurice believes that Laura, a stranger turned mentor, has had a significant impact on his life. The main effect he attributes to Laura is a positive and transformative one.
Throughout the narrative, Maurice expresses gratitude for Laura's presence and guidance.
He believes that she has helped him break free from the cycle of poverty, provided him with emotional support, and instilled a sense of hope and possibility in his life.
Maurice acknowledges that Laura's consistent presence and care have influenced his perspective and choices.
Laura's impact on Maurice extends beyond material assistance; she offers him friendship, encouragement, and a belief in his potential. Maurice recognizes the profound influence of their relationship, describing it as a turning point in his life.
Overall, Maurice believes that Laura's presence has brought about positive changes in his life, shaping his beliefs, aspirations, and future trajectory. Her support and mentorship have empowered him to overcome challenges and strive for a better future.
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not answered question workspace check my work which letter indicates the area of the spinal cord that contains myelinated tracts?
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Letter 'E' indicates the area of the spinal cord that contains myelinated tracts.
Bundles of myelinated pathways comprise the white matter of the spinal cord.
The deeper brain structures, known as the subcortical layer, include white matter. It has axons, which are the nerve cells' neurons' extensions—nerve fibers. The letter A denotes the thalamus. Many of these nerve fibers are protected by a type of sheath or coating known as myelin. remember that the left and right halves of the thalamus are involved. Areas of the substantial apprehensive device CNS that are specifically made from myelinated axons, also referred to as tracts, are said to as having a white count number. The dorsal or posterior lateral, and ventral or anterior columns of the spinal wire, each of which comprises axon tracts associated to specific capabilities, are subdivided into the white count of the spinal wire. Somatic mechanoreceptors in the dorsal columns transmit ascending sensory information.To learn more about spinal cord visit:
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Which of the following forms of water pollution is most associated with mining?
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Awnser: Acid Mine Drainage. Acid Rock Drainage (ARD) is a natural process whereby sulphuric acid is produced when sulphides in rocks are exposed to air and water.
Answer:
the answer is acids and heavy metals
Explanation:
2/3 of the harmful emissions are released from power plants that burn coal to generate electricity.
Briefly explain how the diagram to the right makes a good
model to represent the decay of a radioactive element.
You are encouraged to label the diagram.
You must use complete sentences.
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An element's radioactive decay graph can be categorized as an exponential graph, more particularly, the decay of an element through exponential processes. As x increases exponentially in these graphs, y declines and gets closer to zero.
What is Radioactive Decay (Half Life) Equation?The centre of each atom, or nucleus, which accounts for the majority of an element's mass, is made up of a specific number of protons and neutrons. Even though every element has a unique nucleus, they are not always stable. Radiation is the name for the rays and particles that are emitted by unstable elements in an effort to stabilize their nucleus. As long as the element doesn't have a stable nucleus, this process, known as radioactive decay, continues on its own. Different substances breakdown at different speeds when they go through radioactive decay. Through the use of half lifetimes, these rates are measured. The duration of time before half of the nucleus disintegrates is known as a half-life, as its name would imply.How much of an element remains after a specific amount of time can be calculated using the following equation using half-lives:N\s= N ( 1 /2 ) n
Where N denotes the quantity of the element still present, N 0 is the quantity of the element at the beginning, and n denotes the number of half lives that have passed. By dividing the amount of time that has elapsed (t) by the duration of the half-life (T), one can determine the number of half-lives that have passed, even if this is unknown:n = t / T.
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3.
Which two of the following are the waste products of anaerobic
respiration in yeast?
A sugar
B carbon dioxide
C water
D ethanol
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The chemical reaction of anaerobic respiration for yeast(Saccharomyces) is
C6H1206---->2C2H6O+2CO2(ethanol and carbon dioxide)
the correct answers are B and D
All but one of the following is an endogenous factor: Application rate of herbicide. Acre feet of irrigation water applied. Price of herbicide per gallon. Decision as to which herbicide would be best given farm's IPM strategy
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The factor that is an endogenous factor is: d. Decision as to which herbicide would be best given the farm's IPM (Integrated Pest Management) strategy.
What is an Endogenous Factor?An endogenous factor refers to a factor that originates from within the system or process being studied. In the given options, the endogenous factor is d. Decision as to which herbicide would be best given the farm's IPM (Integrated Pest Management) strategy.
This factor is influenced by internal considerations and decisions made within the system itself. On the other hand, options a, b, and c are exogenous factors because they are external to the system and can affect the system but are not directly determined by it.
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what are the two difference between cymose and racemose
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Cymose and Racemose are two different types of inflorescence in plants. The main differences between them are:
Growth Pattern: Cymose inflorescence is determinate, which means the growth of the main axis is limited and ends with a flower. On the other hand, racemose inflorescence is indeterminate, which means the main axis continues to grow and produces flowers at intervals.
Branching Pattern: Cymose inflorescence has a dichotomous or forked branching pattern, where each branch divides into two branches of equal size, which again divide into two, and so on. In contrast, racemose inflorescence has a unbranched or simple branching pattern, where the main axis produces flowers on lateral stalks without any further branching.
These differences in growth and branching pattern result in distinct shapes and structures of inflorescence in plants.
I NEED HELP ASAP! please answer well and dont put random stuff
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Answer:
Cell-Theory
Explanation:
Once you print, cut all the pieces apart. Then reassemble the puzzle so the the definition backs up with the card that has the term. So if one card says: double helix, the card that matches with it would say: the shape of DNA.
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DNA replication is the process through which DNA duplicates. It occurs in the interphase and involves different enzymes, DNA molecules, and free nucleotides. Terms and definitions in the attached files.
What is DNA replication?
DNA replication is the process through which DNI molecule duplicates. This event takes place during the S stage of the interphase. So when the cell divides during mitosis or meiosis, each cell will get a complete set of chromosomes.
DNI replication is semi-conservative because each new molecule carries an original DNI strand and a new one. The fact that the new molecule is composed of an original strand makes it semi-conservative. The old existing strands are used to synthesize the new complementary strand.
The origin of the replication requires helicase enzymes to break hydrogen bonds and separate the two original strands. The topoisomerase enzyme is necessary to release tension. Other proteins are also needed to join the strains and keep them separated. Once the molecule is opened, there is a region named replication forks. DNA polymerase makes the new nucleotides enter into the fork and pairs them with the corresponding nucleotide of the original strand. Adenine pairs timine, and cytosine pairs guanine.
DNA strands are antiparallel, and replication occurs only in 5'-3' direction. So one of the strands will replicate continuously, while the other strain will be formed by short fragments known as Okazaki fragments.
Primers are needed to make the DNA polymerase work. Primers are small units of RNA and are placed at the beginning of each new fragment.
In the attached files you will find the terms and their definitions.
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which of the following is false about enzymatic reactions? when the temperature is very low, hardly any collision between the enzymes and substrate molecules is possible. when the temperature increases beyond the optimum point, denaturation of enzymes occurs, leading to a drop in enzyme activity. less than and equal to the optimum temperature, any increase in the reaction temperature leads to a decrease in its rate. when the temperature is very low, enzymes are described as being inactive due to low kinetic energy. answer saved
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Less than and equal to the optimum temperature, any increase in the reaction temperature leads to a decrease in its rate is not true regarding enzymatic reactions.
Factors affecting enzyme
The reaction that enzymes catalyse receives activation energy from them.
Temperature is one of the elements impacting enzymes. Substrate molecules start to move more quickly as the temperature rises. By increasing the number of substrate molecules that come into contact with the enzymes' active sites, more substrate can bind.
The enzyme's active sites must be free for the velocity to be at its highest level.
The human body uses enzymes to accelerate chemical reactions. Among many other functions, they are crucial for respiration, food digestion, muscle, and neuron activity. There are thousands of enzymes in each cell of the human body. Each cell's use of enzymes aids in facilitating chemical reactions
Proteins that contain amino acids linked together in one or more polypeptides are called enzymes.
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Akshay wants to study global warming and climate change what field of study would be most useful to him
A. ) sociology
B. ) microbiology
C. ) anthropology
D. ) meterology
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While global warming refers specifically to the increase in global temperatures, climate change encompasses all changes in the climate, including changes in precipitation patterns, sea levels, and the frequency and intensity of extreme weather events.
Meteorology is the scientific study of the atmosphere, including the study of weather patterns, atmospheric conditions, and climate. Meteorologists use a variety of tools and techniques to measure and analyze the atmosphere, including radar, satellites, and computer models. Meteorology is an interdisciplinary field that draws on many different branches of science, including physics, chemistry, and mathematics. Meteorologists use their knowledge of the atmosphere to forecast weather, study climate patterns, and understand the causes of climate change. Thus, in conclusion, the field of study that would be most useful for Akshay to study global warming and climate change is meteorology.
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1.what did magnesium and oxygen atoms had to do to bond ?
2. why did the oxygen atom needed two sodium atoms to bond ?
3. why did the magnesium atom needed two fluorine atoms to bond ?
please put the numbers in order so i know which answer is for the questions thanks <3
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Answer:
1. Magnesium and oxygen atoms bond to form an ionic compound; this is evident because one forms a cation and the other an anion. When an ionic compound is formed, one atom "steals" an electron (or electrons) from another. In this case, an oxygen atom (which is pretty electronegative by the way) "steals" 2 electrons from a magnesium atom. The resulting oxygen anion and magnesium cation attract one another to form a bond (more specifically, an ionic one).
2. The oxygen atom needed two sodium atoms to bond because it needs two additional electrons to achieve a stable octet of electrons. 1 sodium atom provides 1 additional electron after it is "stolen" by oxygen, so 2 sodium atoms are needed in total to form the bond.
3. The magnesium atom needed two fluorine atoms to bond because it needs to lose two electrons to achieve a stable configuration/octet of electrons. 1 fluorine atom "steals" one electron, so 2 are needed in total.
Happy Holidays!
Which is a major source of error in reporting food and beverage intake?
1. Food quality
2. Portion size
3. Food processing
4. Meal timing
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Portion size is a major source of error in reporting food and beverage intake. So, option 2 is the right choice.
major source of error in reporting food and beverage intake is portion size. People often struggle with accurately estimating the amount of food they consume, leading to discrepancies in reported intake. Portion sizes can vary widely, and individuals may underestimate or overestimate their portions, leading to inaccurate reporting of calorie and nutrient intake.Food quality can also impact reporting accuracy, as variations in nutrient composition, ingredients, and preparation methods can affect the nutritional content of the food consumed. However, portion size is generally considered a more significant factor in reporting errors.Food processing can introduce further complexity. Processing methods such as cooking, blending, or grinding can alter the physical properties and nutrient composition of foods. These changes may affect how individuals perceive and report their food intake.Meal timing, although potentially influencing eating behaviors, is not typically considered a primary source of error in reporting food and beverage intake. However, timing can affect appetite, meal composition, and the accuracy of self-reported eating patterns if individuals skip or delay meals.In conclusion, while factors like food quality, food processing, and meal timing can contribute to errors in reporting food and beverage intake, portion size remains a prominent source of inaccuracy.
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Which substance is used by plants during photosynthesis?
a. sulfuric acid c. carbon monoxide b. carbon dioxide d. urea
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Answer:
i say that the answer is c
Explanation:
Answer:
Carbon dioxide
What effect do the sulfate aerosols formed by volcanoes have on global temperatures?
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Answer:
There is overall agreement that volcanic sulphate aerosols in the stratosphere can reduce solar radiation reaching the earth's surface for years, thereby reducing surface temperatures, affecting global circulation patterns and generally the global climate system.
LAST QUESTION WILL GIVE BRAINLIEST!!!!!PLS SHARE YO SMARTNESS!!!!!!!
1. Which two substances have parts of their cycles in which the substance must be "fixed"?
A) nitrogen and water
B) sulfur and oxygen
C) water and phosphorous
Answers
Answer:
its carbon and nitrogen
Explanation:
took the quiz
Carbon and nitrogen are two substances that have parts of their cycles in which the substance must be "fixed". Thus, the correct option for this question is D.
What is Cycle?A cycle may be defined as the series of steps that regularly run in a repeated manner to deliver the needs of organisms. Examples include the carbon cycle, the water cycle, etc.
Carbon is found as a solid in all of their isotopes but nitrogen is typically a gas that is present in 78% of the earth's atmosphere.
Option D is missing in the question which is carbon and nitrogen.
Therefore, the correct option for this question is D.
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which event is most likely to make a stable ecosystem unstable
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The introduction of a new species into an existing ecosystem is most likely to make it unstable.
What is ecosystem?An ecosystem is a community of living organisms and their physical environment that interact together. It includes both biotic (living) and abiotic (non-living) components. The biotic components include plants, animals, and microorganisms, while the abiotic components include physical and chemical factors such as climate, soil, water, and sunlight. Ecosystems can range from small, local ecosystems such as a pond to larger, global ecosystems like the planet Earth.
This is because the new species may compete with the existing species for resources, and the existing species may not be adapted to the new species and may not be able to compete effectively. Additionally, the new species may introduce disease or predation to the ecosystem, further disrupting the balance.
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Why is ∆Hf0 62.4 kJ/mol for I2(g), but 0.0 kJ/mol for I2(s)?
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Answer:
12(s) is in its standard state.
Explanation:
some predators feed preferentially on the most abundant prey. this type of predation is
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some predators feed preferentially on the most abundant prey. this type of predation is density dependent .
predation is a process by which the organism eat other organism for their food. predator process is the organism who eats the other organism are called predators and the organism which is eaten is called pray.
Predator help in maintaining the pray species pollution and keep them under control .In predation, one organism kills and consumes another. Predation provides energy to prolong the life and promote the reproduction of the organism that does the killing, the predator, to the detriment of the organism being consumed, the prey.
Predators are organisms that hunt and kill other organisms for food. The organisms that are consumed by the predators are known as the prey. Predators can be carnivores and omnivores. Lions, tigers, sharks, and snakes, all are predators.
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wh
which event is part of the exposition in "Cinderella"?
The slipper fits Cinderella’s foot.
A fairy godmother appears to Cinderella.
The prince and Cinderella get married.
An invitation to the prince’s ball arrives.
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Answer:
An invitation to the prince’s ball arrives.
Explanation:
an exposition is in the beginning of the story, leading to the climax. the invitation leads to cinderella meeting the prince.
countable and uncountable noun ten examples
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Answer:
Countable: dogs, cats, sheep, trees, roads, signs, men, women, planets, universes
Uncountable: rain, water, dirt, flour, wine, wood, plastic, glass, dust, grass
Explanation:
an xkmKJGWIgdK>kCKbmanvK.UEFIU;lage;kfkahefkj
In one year, 35 giraffes are born to a population. What does this number represent?
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check all of the statements that are correct regarding the classification of exocrine glands.
a.Simple glands always have a single, unbranched secretory portion.
b.Compound glands have branched ducts. c. Tubular glands have References diameter of the duct and secretory portions. d.Acinar glands have secretory acini and secretory tubules. e.A gland whose secretory cells form an expanded sac is an acinar gland.
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The statements that are correct regarding the classification of exocrine glands are b. Compound glands have branched ducts; c. Tubular glands have References diameter of the duct and secretory portions; and e. A gland whose secretory cells form an expanded sac is an acinar gland.
These statements are correct regarding the classification of exocrine glands. Simple glands may have a single unbranched secretory portion or may be coiled, whereas compound glands have branched ducts and may be tubular, acinar, or tubular-acinar in shape.
Tubular glands have a uniform diameter of the duct and secretory portions, whereas acinar glands have secretory acini and secretory tubules. A gland whose secretory cells form an expanded sac is an acinar gland. Therefore, the correct statements regarding the classification of exocrine glands are given by options b,c, and e.
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Tetanus is a condition caused by bacteria. The bacteria live in the soil and become
active in a human host causing painful, uncontrolled muscle spasms. What most
likely allows the bacteria to survive in the soil?
A the bacteria use cilla to digest small protists.
B the bacteria release water and nutrients into the soil.
C the bacteria use flagella to burrow deep into the soil to escape extreme heat.
D the bacteria create endospores making the bacteria resistant to environmental conditions.
Answers
Answer: The answer is D: the bacteria create endospores making the bacteria resistant to environmental conditions.
Explanation:
The most likely reason that the bacteria that cause tetanus are able to survive in the soil is because they create endospores, which makes them resistant to environmental conditions. Endospores are a type of hardy, dormant form of the bacteria that can survive extreme conditions, such as heat, cold, and desiccation. By creating endospores, the bacteria are able to survive in the soil and remain inactive until they encounter a suitable host.
Please help me on this
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Please help me pleaseeee
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Answer:
on the size of their hearts, not their physical size.
Explanation:
name the organs of the urinary system and their functions
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The organs of the urinary system include the kidneys, ureters, bladder, and urethra.
The kidneys are the primary organs of the urinary system and are responsible for filtering waste products and excess fluids from the blood to produce urine. They regulate the body's water and electrolyte balance, maintain blood pressure, and help in the production of certain hormones.
The ureters are long, muscular tubes that transport urine from the kidneys to the bladder. They propel urine through peristaltic contractions, ensuring the unidirectional flow of urine.
The bladder is a hollow, muscular organ that stores urine until it is eliminated from the body. Its muscular walls expand to accommodate urine and contract during urination to expel urine through the urethra.
The urethra is a tube that carries urine from the bladder to the external opening of the body. In males, it also serves as the passageway for semen during ejaculation.
Together, these organs work in a coordinated manner to remove waste products, maintain fluid balance, and eliminate urine from the body. They play a crucial role in the excretory function of the body and help maintain overall homeostasis.
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Darwin discovered variations in species; what is the difference between interspecific variation and intraspecific variation
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Intraspecific variation, also referred to as "within species variation," is the term used to describe variation within members of the same species. Contrarily, interspecific variation (also known as "across species" variation) refers to variation that takes place when contrasting members of different species.
Interspecific and intraspecific variance explained A biology course?Individuals belonging to the same species can differ from one another interspecifically. Interspecies variance is referred to as intraspecific variation.
What do intraspecific differences mean?Local extinctions, reductions in population abundance, and anthropogenic selection are threats to intraspecific variation, which encompasses the genetic and phenotypic diversity observed within and among populations. However, analyses of biodiversity frequently overlook this decline in species variety.
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Answer: D
Explanation:
intra - inside
inter - outside