Question

What is the difference between the enzymes DNA polymerase I and ligase?

Select one:

a. DNA polymerase I binds to Okazaki fragments, removes the primers, and replaces them with DNA nucleotides.

b. Ligase binds to Okazaki fragments, removes the primers, and replaces them with DNA nucleotides.

c. DNA polymerase I attaches the fragments to make one single continuous strand.

d. Ligase attaches the Okazaki fragments to make one single continuous strand.

e. Both A and D are correct.

f. Both B and C are correct.

g. None of the above are correct.

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Where can telomeres be found?

Select one:

a. On the ends of prokaryotic chromosomes.

b. Telomeres have nothing to do with chromosomes.

c. Throughout prokaryotic chromosomes.

d. On the ends of eukaryotic chromosomes.

e. Throughout eukaryotic chromosomes.

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Which of the following is NOT a reason for mitotic cell division?

Select one:

a. Regular tissue regeneration

b. Tumor formation

c. Pollen production in flowers

d. Fetal growth

e. Tissue repair after injury

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Which of the following is true about a triploid organism with a n=3 during the G1 phase of the cell cycle

Select one:

a. It would have 9 X-shaped chromosomes

b. It would have 9 linear chromosomes

c. It would have 3 linear chromosomes

d. It would have 6 X-shaped chromosomes

e. It would have 3 X-shaped chromosomes

f. It would have 6 linear chromosomes

Answer 1

Answer) e is the answer

Ligase joins the okazaki fragments which are found in the lagging strand during the DNA replication.

DNA polymerase binds to okazaki fragments. It leads to remove the RNA primer from okazaki segments. And fill the gap by adding nucleotides.

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Answer) d is the answer.

Telomere is synthesised in the eukaryotic chromosome during DNA replication by telomerase enzyme. It is not found in prokaryotes.

It is found at the end of eukaryotic chromosome.

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Answer) c is the answer.

Mitosis is an equational division. It gives rise yo identical daughter cell. They have equal number of chromosomes as found in the parent cell.

The meiosis is a reductional division. It reduces the chromosomes number to half. Pollens are produced in flower by the process of meiosis. That's why the pollen are not produced by the mitosis.

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Answer) f

The G1 phase don't have replicated chromosomes. Thats why there is found linear chromosomes. The n= 3. It means haploid cell has 3 chromosomes. The G1 phase has 3×2=6 chromosomes. Hence there is found 6 chromosomes with linear shaped.

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