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kompoz [17]
2 years ago
12

Keystone predators can maintain species diversity in a community if they _________. A. competitively exclude other predators B.

prey on the community's dominant species C. allow immigration of other predators D. prey only on the least abundant species in the community
Biology
1 answer:
Alisiya [41]2 years ago
8 0

Keystone predators can maintain species diversity in a community if they  prey on the community's dominant species

Option B is correct.

What is meant by keystone predator?

A keystone species is usually a dominant predator whose removal allows a prey population to explode and often decreases overall diversity. other forms of keystone species are those, like coral or beavers, that significantly alter the habitat around them and thus affect large numbers of other organisms.

Are keystone species always predators?

A keystone species is usually , but not always, a predator. Just some predators can control the distribution and population of large numbers of prey species. the whole concept of keystone species was founded on research surrounding the influence of a marine predator on its environment.

Learn more about keystone predators:

brainly.com/question/506554

#SPJ4

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What proportion of DNA molecules will contain any radioactivity after two rounds of replication?
Vladimir [108]

Answer: After two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

Explanation:

In semi-conservative replication, two DNA molecules are created, each consisting of one strand of the original DNA and one new complementary strand. In other words, the <u>DNA is formed from one old strand and one new strand.</u> And the existing strands serve as a complementary mould to the new ones.  

Meselson-Stahl's experiment involves growing the bacterium <em>Escherichia coli </em>in a medium containing radioactive nitrogen. Watson and Crick had predicted that DNA replication was semi-conservative, <u>if so the DNA extracted from the bacteria would be somewhere in between the DNA extracted from the "normal" nitrogen medium and the radioactive nitrogen medium.</u>

DNA replication, which occurs only once in each cell generation, <u>requires many "building blocks", enzymes, and a great deal of energy in the form of ATP.</u> The nucleotides, which are the building blocks of DNA, have to be assembled and available in the nucleus along with the energy to bind them together.  Each nucleotide consists of three parts: a nitrogen-containing ring structure called a nitrogen base, a five-carbon sugar, and at least one phosphate group.

Through the action of DNA polymerase during replication,<u> new nucleotides bind to the corresponding nucleotide of the original chain (A to T, C to G).</u>

Since the DNA strands are anti-parallel, and replication proceeds only in the 5' to 3' direction on both strands, one strand will form a continuous copy, while the other will form a series of short fragments known as Okazaki fragments. The chain that is synthesized continuously is known as the forward chain and the chain that is synthesized in fragments is known as the backward chain.

Then, since replication is semi-conservative, the new strand will have nucleotides with "normal" nitrogen while the new strand created from that same DNA molecule will incorporate nucleotides with radioactive nitrogen. So, after two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

7 0
3 years ago
8. Which of these is the direct result of an error in the transcription of a DNA
Ulleksa [173]

Answer:

D. RNA sequence is incorrect.

Explanation:

Genome editing can be defined as a high-tech process which avail scientists the opportunity or ability to remove (delete), replace and insert Deoxyribonucleic Acid (DNA) sequence in a living organism such as bacterias, animals, plants etc in order to correct a genetic disorder and to improve on their physical and chemical conditions.

Transcription can be defined as a process which typically involves re-writing the informations contained within a Deoxyribonucleic Acid (DNA) into a Ribonucleic Acid (RNA) by enzyme RNA polymerase.

When a RNA sequence is incorrect, it leads to an error in the transcription of a DNA nucleotide.

This ultimately implies that, an error in the transcription of a DNA nucleotide is the direct result of an incorrect codon sequence (RNA nucleotides).

3 0
3 years ago
Which processes require oxygen
zubka84 [21]

Answer:

so many processes requires oxygen to operate .

An example is the process of plants making their own food .

4 0
4 years ago
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Movement of the chromosomes during anaphase would be most affected by a drug that
My name is Ann [436]

Answer:

The options are missing, the options are:

A) prevents the duplication of centrosomes. B) prevents nuclear envelope fragmentation C) prevents shortening of microtubules. D) prevents attachment of the microtubules to the kinetochore. E) prevents nucleosome formation

The answer is C

Explanation:

Cell division is a characteristics of all living cells. Whether meiosis or mitosis, the chromosomes separate in the Anaphase stage. Prior to the anaphase stage is the metaphase, where spindle microtubules attach to the kinetochores of each chromosome and aligns them at the centre of the cell called METAPHASE PLATE.

Thus, since the aligning of chromosomes at the metaphase plate has to do with attachment of microtubules to chromosomes' kinetochores, the drug that will hinder movement of chromosomes to opposite poles will not stop formation of microtubules. Instead, it will prevent the formed microtubules attached to each chromosome from shortening, as it is the shortening of microtubules that facilitates the pulling apart of the chromosomes they are attached to.

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3 years ago
I dont know these can someone help
anastassius [24]
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