Question

Pork Which one of the following statements correctly describes telomerase"? Select one: a. Telomerase uses the DNA as a template for synthesizing a new strand. b. Activity of this enzyme is inhibited in many cancerous cells. c. It creates repetitive DNA at the end of the chromosomes, d. This enzyme is active in all dividing cells. In the 1953 article where Watson and Crick describe the structure of DNA, they make reference to a possible copying mechanism for the molecule. What do they say? Select one: a. They point out that the specific base pairing they are proposing in itself suggests a possible copying mechanism. b. They note that the helical structure will make it difficult for any copying mechanism, so future research will be required to elucidate how it is accomplished by the cell. They propose the possibility that enzymes could separate the two strands of DNA d. They include data supporting the likelihood that the copying mechanism will require the breaking of hydrogen bonds. During the process of DNA replication in the cell primers are added to the template strands. These primers are made up of DNA bases. Select one: True question False Type here to search

Answer 1

1) telomerase is an enzyme which produces telomeres, the enzyme has an RNA, which is used as the template for the synthesis of the telomere. telomerase enzyme is activated in cancer cells, and differentiated cells won`t express telomerase enzyme, the telomerase enzyme is active in embryonic cells and in cancer cells.

so the answer is c) It created repetitive DNA at the end of the chromosomes.

( telomeres are repetitive DNA at the ends of the chromosome).

2) Watson and Crick prosed the double helix structure of the DNA, and two strands of the DNA are complementary to each other so they proposed that this complementarity of DNA plays role in the copying of the DNA, that has been proved by Messelson and Stahl experiment, one strand is used the template for the synthesis of new strand.

so the answer is a) they point out that specific base pairing they are proposing itself suggests a possible copying mechanism.

3) primers are added to the newly synthesized strand primers gives the 3`-OH group to which the DNA polymerase can add new nucleotides and primers are made of RNA.

so the given statement is b) False.