By placing sieve elements, also known as sieve-tube members, end to end in a chain, sieve tubes are created.
Sieve tube cells and companion cells develop into what?Companion cells, which join with sieve tubes to form the sieve element-companion cell complex, are cells that are associated with the members of the sieve tube. By doing so, it is possible to nourish and maintain plant cells as well as communicate with other distant plant parts.
What makes companion cells different from sieve tubes?The primary distinction between sieve tubes and companion cells is that the former are the lengthy, narrow, pointed tubes found in the phloem of angiosperms, whilst the latter are the cells that are linked to the sieve tubes and control their function.
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Under which conditions would air hold less water vapor than it holds at 30°C
(86°F) with sunny skies?
A. 34°C (94°F) with cloudy skies
B. 30°C (86°F) with cloudy skies
C. 22°C (86°F) with sunny skies
D. 32°C (90°F) with sunny skies
Answer:
B
Explanation:
jus CS its right
The relative humidity of the air affects how much water vapor it can hold. 30°C (86°F) with cloudy skies would air hold less water vapor than it holds at 30°C (86°F) with sunny skies. So, the correct option is B.
What is Relative humidity?Relative humidity (RH) measures the amount of moisture in the air compared to the maximum amount of moisture in the air at a given temperature and pressure. It is a standard figure for describing the moisture content of the air and is expressed as a percentage.
At a given temperature and pressure, air is considered to have 100% relative humidity when it contains all the moisture it can hold. The temperature at which the moisture in the air begins to condense into droplets is known as the dew point.
Therefore, the correct option is B.
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Anyone good in Biology?
Answer:
6 Cell Organelles
Nucleus. nucleus; animal cellA micrograph of animal cells, showing the nucleus (stained dark red) of each cell. ...
Ribosomes. Ribosomes are the protein factories of the cell. ...
Endoplasmic reticulum. ...
Golgi apparatus. ...
Chloroplasts. ...
Mitochondria.Explanation:Animal cells each have a centrosome and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, whereas animal cells do not
identity two excretory products produced by plants
Answer:
Carbon dioxide, excess water produced during respiration and nitrogenous compounds produced during protein metabolism are the major excretory products in plants. Plants produce two gaseous waste products i.e. oxygen during photosynthesis and carbon dioxide during respiration.
a. Plants use CO2 in the process of ___________________ to make___________ and oxygen. b. Animals use oxygen in the process of _______________ and make more CO2. c. The ____________________________ is the main regulator of CO2 in the atmosphere because CO2 dissolves easily in it. d. In the past, huge deposits of carbon were stored as dead plants and animals ______________________. e. Today these deposits are burned as fossil fuels, which include ____________________, _____________________, and ___________________________. f. More CO2 is released in the atmosphere today than in the past because of the _________________________ . g. Too much CO2 in the atmosphere may be responsible for the _________________________________ effect/global warming.
a. Plants use CO2 in the process of photosynthesis to make glucose (sugar) and oxygen.
b. Animals use oxygen in the process of cellular respiration and make more CO2.
c. The oceans are the main regulator of CO2 in the atmosphere because CO2 dissolves easily in them.
d. In the past, huge deposits of carbon were stored as dead plants and animals in the form of fossil fuels.
e. Today these deposits are burned as fossil fuels, which include coal, oil, and natural gas.
f. More CO2 is released into the atmosphere today than in the past because of human activities, such as burning fossil fuels and deforestation.
g. Too much CO2 in the atmosphere may be responsible for the greenhouse effect/global warming,
where increased concentrations of greenhouse gases trap heat and lead to rising temperatures on Earth.
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Someone plz help me :(
a neurospora mutant that was defective in the ability to convert citrulline to arginine (the last step in arginine biosynthesis) would be able to grow on
A Neurospora mutant that was defective in the ability to convert citrulline to arginine (the last step in arginine biosynthesis) would be able to grow on minimal medium supplemented with arginine.
What is Neurospora ?A genus of Ascomycete fungi is called Neurospora. The name of the genus, which means "nerve spore," alludes to the distinctive striations that mimic axons on the spores. The best-known member of this genus is the standard model organism in biology, Neurospora crassa.
What is arginine ?The amino acid with the formula CN(CH2)3CHCO2H is arginine. A guanidino group is attached to a typical amino acid framework in the molecule. The carboxylic acid is deprotonated and the amino and guanidino groups are both protonated at physiological pH, forming a cation.
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When something acts against something, causing it to have less of an effect what is it called?
Answer:
Counteract
Explanation:
You are describing the definition of the word Counteract so that must be the answer.
Tell me if you think caecilians are amphibians, reptiles, or fish.
Answer:
Amphibians
Explanation:
which species do you think is best adapted to a diet of small, delicate seeds? explain why you think so
which species do you think is best adapted to a diet of large, tough-to-crack seeds? Explain
Explanation:
which species do you think is best adapted to a diet of small, delicate seeds? explain why you think so? geospiza fortis because they have a small short beak
which species do you think is best adapted to a diet of large, tough-to-crack seeds? Explain geospiza magnirostns because they have a big sharp beak to break seeds
Show the Direction of Water →
Expand, Shrink, Stay the Same
Hypertonic, Hypotonic or Isotonic
8% Salt
17% Salt
12% Salt
5% Salt
15% Salt
11% Salt
2% Salt
4% Salt
7% Salt
7% Salt
What’s the blanks?
Answer:
Its joe
Explanation:
Joe pen15 into my b00ty hole and i eat it
What term describes a pair of chromosomes consisting of one chromosome from the father and one from the mother?
What letter is representing the 1st Half-Life of the parent element. How do you know?
The letter \(t_{1/2}\) is used to representing the 1st half-life of the parent element.
How is an element's half-life determined?After that, the half-life is calculated using the basic definition of activity, which is the sum of the radionuclide decay constant, and the number of radioactive atoms present, N. From the equation λ = ln2/\(T_{1/2}\), one solves for and obtains the half-life.
A radioactive substance's half-life, or how long it takes for one half of its atoms to break up or change into another substance, is typically defined. Ernest Rutherford made his initial discovery of the idea in 1907. The Ug or \(t_{1/2}\) symbol is typically used to denote it.
A reaction's half-life is the amount of time needed for a reactant to reach half of its initial concentration or pressure. The half-life is concentration-independent and constant over time for a first-order reaction.
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When Christopher Columbus came to the Americas, he randomly chose 3 chickens from Spain to bring along. These 3 chickens were the only chickens to breed
in the Americas for hundreds of years. Which term below does this BEST represent?
A. Natural Selection
B. Bottleneck Effect
C. Hardy Weinberg Equilibrium
D. Founder's Effect
why should you not eat sweets after brushing teeth at night.
Answer:
Bc u dont
Explanation:
It makes ur breath smell bad
Answer:
we should not eat sweets after brushing teeth at night
we should not eat sweets after brushing teeth at nightbecause when we eat sweets then it get stuck with our teeth and when microorganisms
we should not eat sweets after brushing teeth at nightbecause when we eat sweets then it get stuck with our teeth and when microorganismseat these then they produce acid which harm our teeth
we should not eat sweets after brushing teeth at nightbecause when we eat sweets then it get stuck with our teeth and when microorganismseat these then they produce acid which harm our teeth hope it helps
Which of the following is an advantage of sexual reproduction over asexual reproduction?
a
It ensures that all offspring will survive if disease strikes.
b
It passes genetic information from one parent to one offspring.
c
It allows the offspring species to look just like the parent species.
d
It makes species more able to adapt to environmental changes.
Answer:
d
Explanation:
Which of the following fungal infections results in a white, curdy discharge?
candidiasis
pyelonephritis
ophthalmia neonatorum
The fungal infection that results in a white, curdy discharge is candidiasis.
Candidiasis is caused by the overgrowth of Candida, a type of yeast that naturally resides in the body. It commonly affects areas such as the mouth (oral thrush) and genital region (genital candidiasis or yeast infection). In cases of vaginal candidiasis, a white, curdy discharge is often one of the characteristic symptoms.
Other symptoms may include itching, redness, and discomfort in the affected area. It is important to note that the other options provided, pyelonephritis and ophthalmia neonatorum, are not fungal infections and do not typically result in a white, curdy discharge.
Therefore, Candiasis is the correct answer.
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100 Points y'all!!!!!!!!!!! Will mark brainliest too!
Lionfish are native to the tropical waters of the Indo-Pacific. What conclusions can be made about the impact of ocean warming on the range of lionfish and, therefore, on biodiversity?
Rising ocean temperatures have expanded the range of the lionfish; with little competition, it consumes smaller fish, reducing biodiversity.
Global warming has forced the lionfish to warmer waters where it is able to mate with native fish, increasing biodiversity.
Climate change has restricted the habitat of lionfish. It has become an endangered species, reducing biodiversity.
Lionfish thrive in high carbon dioxide environments; they eat all of the native species in the area, reducing biodiversity.
Answer:
Rising ocean temperatures have expanded the range of the lionfish; with little competition, it consumes smaller fish, reducing biodiversity.
Explanation:
As ocean temperatures have increased, the range of the lionfish has increased. As a top predator, it has little competition for eating smaller fish, causing massive destruction by eating endangered fish, reducing biodiversity.
Which of the following is NOT a function of the specialized ependymal cells that form the choroid plexus?
a. addition of organic nutrients from nearby blood vessels to the CSF b. removal of waste products from the CSF
c. removal of pathogenic bacteria from the CSF d. addition of oxygen to the CSF
The correct option among the following given options that is not a function of the specialized ependymal cells that form the choroid plexus is d. addition of oxygen to the CSF.
Ependymal cells are a type of neuroglia that line the brain's ventricles and central canal. The brain and spinal cord are lined with ciliated ependymal cells, which move cerebrospinal fluid (CSF).
They are separated from the CSF by tight intercellular junctions, but they make up the blood-cerebrospinal fluid barrier, which allows materials to cross between the two fluid compartments. They are mostly found in the ventricles of the brain.
The functions of Ependymal cells are :
a. Addition of organic nutrients from nearby blood vessels to the CSF
b. Removal of waste products from the CSF
c. Removal of pathogenic bacteria from the CSF
Thus, among the given statements, option d is not a function of the specialized ependymal cells.
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I really need help my grades go in tonight and this is my last day you will get full points
Answer:
the flat horizontal lines indicate phase change
Explanation:
As the substance changes phase from solid to liquid and liquid to gas, the temperature remains contant due to latent heat energy.
Energy is being used to break the intermolecular bonds during phase change, therefore there is no change in temperature.
A sample of Potassium-40 has a mass of 2020 grams.
Potassium-40 has a half life of 1.3 b.y. How much Potassium-40 and Argon 40 would there be after 5.2 b.y.
The idea here is that the ratio that exists between the number of atoms of argon-40 and the number of atoms of potassium-40 will give you the number of half-lives that passed.
As you know, the half-life of a radioactive nuclide tells you the time needed for half of the atoms of said nuclide to undergo radioactive decay.
In your case, you know that potassium-40 has a half-life of
1.25
billion years because that's how long it takes for half of the number of atoms present in the sample to decay to argon-40.
Now, let's say that your sample started with
A
K-40
atoms of potassium-40 and
0
atoms of argon-40.
You can thus say that the sample will contain--keep in mind that the atoms of potassium that decay form argon-40!
After
1
half-life
1
2
⋅
A
K-40
=
A
K-40
2
1
→
atoms of potassium-40
A
K-40
−
A
K-40
2
1
→
atoms of argon-40
After
2
half-lives
1
2
⋅
A
K-40
2
1
=
A
K-40
2
2
→
atoms of potassium-40
A
K-40
−
A
K-40
2
2
→
atoms of argon-40
After
3
half-lives
1
2
⋅
A
K-40
2
2
=
A
K-40
2
3
→
atoms of potassium-40
A
K-40
−
A
K-40
2
3
→
atoms of argon-40
At this point, we can use this pattern to say that after
n
half-lives pass, the sample will contain
A
K-40
2
n
→
atoms of potassium-40
1
−
A
K-40
2
n
→
atoms of argon-40
Now, you know that sample contains
31
atoms of argon-40 for every
1
atom of potassium-40, which means that you have
A
K-40
−
A
K-40
2
n
A
K-40
2
n
=
31
This is equivalent to
A
K-40
−
A
K-40
2
n
A
K-40
2
n
=
31
2
n
−
1
2
n
⋅
2
n
1
=
31
which gives you
2
n
=
32
Since
32
=
2
5
you can say that
2
n
=
2
5
⇒
n
=
5
This means that
5
half lives must pass in order for the sample to contain
31
atoms of argon-40 for every
1
atom of potassium-40.
Consequently, you can say that the age of the rock is
5
half-lives
⋅
1.25 billion years
1
half-life
=
6.25 billion years
−−−−−−−−−−−−−−−
I'll leave the answer rounded to three sig figs, but keep in mind that you have two significant figures for the number of atoms of argon-40 present per atom of potassium-40.
Choose the term that correctly describes the relationship between these two sugar molecules: a. structural isomers b. cis-trans isomers c. enantiomers d. isotopes
The two compounds are structural isomers.
What are isomers?Isomers are compounds with the same molecular formula but different structural formula. This implies that isotopes have different atom to atom connections. This means that the atoms are connected differently.
Let us now examine the two structures in the image attached to this answer, we can see that the two compounds differ only in the position of the carbonyl bond.
This implies that the two compounds are structural isomers.
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Describe the function of carbohydrates in your body.
The function of carbohydrates in your body is carbohydrates give you energy, the food you consume is broken down into glucose.
What is Carbohydrates?Carbohydrates is defied as that contains biomolecule that contains carbon hydrogen and oxygen in a ratio of 2:1. Carbohydrates are mane source of energy of the body they work as fuel for the brain, kidneys central nervous system and heart muscle.
\(Cn(H2O)n\) is the basic formula for all carbohydrates . But this formula have limitation i.e it applies where same amount of carbon and water are use. Initially the terms carbohydrate was used to describe compounds that have really contains carbohydrates. Because they had simple formula \(CH20.\)
In modern Era carbohydrates are classified on the basis of their structure not on their formulae. Such as aldehydes and ketones are now known as polyhydroxy.
Therefore, The function of carbohydrates in your body is carbohydrates give you energy, the food you consume is broken down into glucose.
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The Gram stain is an example of a _______ staining procedure, which takes advantage of the fact that cells or parts of cells react differently and can be distinguished by the use of two different dyes. Multiple Choice
The Gram stain is an example of a differential staining procedure, which takes advantage of the fact that cells or parts of cells react differently and can be distinguished by the use of two different dyes. It helps classify bacteria into Gram-positive or Gram-negative groups by their cell wall characteristics.
The Gram stain is an example of a differential staining procedure, which takes advantage of the fact that cells or parts of cells react differently and can be distinguished by the use of two different dyes. In the Gram staining technique, a crystal violet dye is applied to the bacterial cells, followed by iodine solution. This forms a complex that is retained by Gram-positive bacteria, giving them a purple color. In contrast, Gram-negative bacteria are decolorized by alcohol or acetone, and a counterstain, typically safranin, is applied to give them a pink/red color.
The Gram stain is widely used in microbiology to differentiate bacteria into two major groups, Gram-positive and Gram-negative, based on the differences in their cell wall structure. Gram-positive bacteria have a thick peptidoglycan layer that retains the crystal violet dye, while Gram-negative bacteria have a thinner peptidoglycan layer and an outer membrane that allows the dye to be washed away.
Overall, the Gram stain is a valuable tool for the initial identification and classification of bacteria in clinical, research, and diagnostic settings.
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: What are the different biosafety levels? What practices would you recommend to be used in Bio Safety Level 1 and how do these differ from Bio Safety Level 2? What does biosafety level 4 mean? What type of pathogens can only be handled in these labs?
The different biosafety levels are categorized as BSL-1, BSL-2, BSL-3, and BSL-4. In BSL-1, basic laboratory practices are recommended, focusing on minimal risk agents.
BSL-2 involves moderate-risk agents and additional safety precautions, such as personal protective equipment and enhanced facility design. BSL-4 is the highest biosafety level, involving the handling of dangerous and exotic pathogens, and it requires maximum containment facilities and strict protocols.
1. Biosafety levels (BSL): Biosafety levels are a set of guidelines and protocols established to ensure the safe handling of biological agents in laboratories and other facilities. The levels are classified based on the risk level of the agents being handled and the necessary containment measures.
2. BSL-1: Biosafety Level 1 is the lowest level and involves working with well-characterized agents that pose minimal risk to individuals and the environment. Practices recommended in BSL-1 labs include standard hygiene practices, minimal personal protective equipment (PPE), and basic laboratory controls to prevent accidental exposure.
3. BSL-2: Biosafety Level 2 includes moderate-risk agents that can cause disease in humans but have effective treatments and vaccines available. In BSL-2 labs, additional safety precautions are implemented, including the use of appropriate PPE such as lab coats, gloves, and eye protection. The facility design may include features like self-closing doors, restricted access, and enhanced ventilation systems.
4. BSL-4: Biosafety Level 4 is the highest level and is reserved for handling dangerous and exotic pathogens that pose a high risk of aerosol transmission and for which there are no available vaccines or treatments.
BSL-4 labs require maximum containment facilities with advanced features like negative pressure sealed rooms, high-efficiency air filtration systems, and complete personal protective suits (e.g., positive pressure suits). Strict protocols and highly trained personnel are essential in BSL-4 labs.
5. Pathogens handled: The specific pathogens that can be handled in each biosafety level vary. BSL-1 labs typically handle well-characterized agents like non-pathogenic strains of E. coli or Bacillus subtilis. BSL-2 labs can handle moderately hazardous agents like Staphylococcus aureus or Hepatitis B virus.
BSL-4 labs handle the most dangerous pathogens, including Ebola virus, Marburg virus, and other highly contagious and lethal pathogens.
In summary, biosafety levels provide a framework for safely handling biological agents. BSL-1 involves basic laboratory practices, while BSL-2 includes additional safety measures for moderate-risk agents.
BSL-4 is the highest level, requiring maximum containment facilities and strict protocols for handling dangerous and exotic pathogens that lack effective treatments or vaccines. The choice of biosafety level depends on the risk posed by the specific pathogens being handled.
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one primitive trait of ardipithecus ramidus is its group of answer choices opposable big toe pelvis. hip. flat face.
The Opposable toe is one of Ardipithecus ramidus' primordial characteristics.
A species of hominid known as Ardipithecus ramidus lived in the early Pliocene about 4.5 million years ago. The grasping or opposable big toe of Ardipithecus ramidus, which is specialized for mobility in trees, is a primordial characteristic of this species. The characteristics referred described as "primitive qualities" come from remote ancestors.
Humans and other primates have opposable thumbs. Additionally, several primates have opposable large toes that can be used similarly to an opposable thumb. Humans are the only primates without an opposable big toe. For movement in trees, where they can utilize it to hold trees while climbing, opposable big toes were developed. All previously known hominins lacked an opposable big toe, but Ardipithecus ramidus did.
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which statement correctly describes most cinder cone volcanoes?
a) they are one of the tallest types of volcanoes.
b) they have a single,symmetrical cone at the top.
c) they often take thousands of years to form.
d) they emit lava that slowly spreads before cooling.
Statement correctly describes most cinder cone volcanoes are they have a single, symmetrical cone at the top
Cinder cones are the simplest type of volcano and they are built from particles and blobs of congealed lava ejected from a single vent and as the gas charged lava is blown violently into the air and it break into small fragments that solidify and fall as cinders around the vent to form circular cone and oval cone and a cinder cone is a steep conical hill of loose pyroclastic fragment and such as volcanic and clinkers and volcanic ash
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Answer:B
Explanation:
PLEASE HELP ASAP
43. In prokaryotic genomes, groups of functionally related genes along with their promoters and operators are found together in ________.
an enhancer
an operon
a repressor
a regulatory gene
Answer:
a regulatory gene
Explanation:
Answer:
the answer is an operon
Explanation:
Operons occur primarily in prokaryotes but also in some eukaryotes, including nematodes such as C.elegans and the fruit fly, drosophila melanogaster. rRNA genes often exist in operons that have been found in a range of eukaryotes including chordates.
Part C What is the genetic basis of a bacterium being F it lacks the F plasmid Oit lacks the F sequence in its genome it contains the Fsequence in its genome it contains the F+ plasmid
The genetic basis of a bacterium being F is that it contains the F+ plasmid, which is a circular DNA molecule that can transfer genetic material from one bacterium to another via conjugation. The correct option is (d) and the other options are incorrect as the presence or absence of the F plasmid or sequence in the genome determines whether a bacterium is F+ or F-.
In bacteria, the F plasmid (fertility factor plasmid) is a circular DNA molecule that can transfer genetic material from one bacterium to another via conjugation. When a bacterium contains the F plasmid, it is designated as F+ and is able to transfer the plasmid to a F- bacterium, making it F+.On the other hand, if a bacterium lacks the F plasmid, it is designated as F-. Therefore, option (a) is incorrect because it implies that a bacterium lacking the F plasmid is designated as F, which is not true.Option (b) is also incorrect because the F sequence (origin of transfer) is located within the F plasmid and is necessary for the plasmid to be transferred during conjugation. A bacterium lacking the F sequence would not be able to transfer the F plasmid, and thus would not be designated as F+.Option (c) is also incorrect because while some bacteria may have a naturally occurring plasmid that is similar to the F plasmid and may also transfer genetic material, it is not designated as F. The designation F+ specifically refers to the presence of the F plasmid.Therefore, the correct answer is (d) - a bacterium is designated as F+ when it contains the F+ plasmid.
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in science why is it important to have more than one peice of evidence to support your claim
In E. coli, there is a mutation in a gene called dnaB that alters the helicase that normally acts at the origin. Which of the following would you expect as a result of this mutation?
A
No proof reading will occur.
B
No replication fork will be formed.
C
Replication will occur via RNA polymerase
D
Replication will require a DNA template from another source.
In E. coli, a mutation in a gene called dna B that alters the helicase that typically acts at the origin would result in B) No replication fork will be formed.
DNA helicase is an enzyme that separates DNA strands during DNA replication. It catalyzes the unwinding of the parental double helix, allowing each strand to act as a template for the synthesis of a new complementary strand by DNA polymerase.
DNA helicase separates the DNA strands at a replication fork by using ATP hydrolysis to travel along the DNA molecule in a 5' to 3' direction. ATP hydrolysis unwinds the double helix by breaking the hydrogen bonds between complementary bases in the two strands.
During DNA replication, the replication fork is the site where the parental DNA double strand separates, and the new daughter DNA strands are synthesized by DNA polymerase.
It is a Y-shaped structure that forms when the DNA double helix separates into two strands at the origin of replication, and each strand acts as a template for DNA synthesis. The replication fork moves along the DNA molecule as DNA synthesis continues, and replication is complete when the two forks meet at the termination site.
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