Question

1.What is the role of telomerase in DNA replication?

a) join Okazaki fragments together

b) synthesize RNA nucleotides to make a primer

c) catalyze the lengthening of the ends of linear chromosomes

d) are part of the initiation of replication at the origin of replication

2. RNA polymerase for mRNA transcription and DNA polymerase in replication differ in that

a) RNA polymerase uses RNA as a template, and DNA polymerase uses a DNA template.

b) RNA polymerase does not need to separate the two strands of DNA in order to synthesize an RNA copy, whereas DNA polymerase must unwind the double helix before it can replicate the DNA.

c) RNA polymerase uses a single-stranded DNA template, and DNA polymerase uses a double-stranded DNA template.

d) RNA polymerase can initiate RNA synthesis without a primer, but DNA polymerase requires an RNA primer.

Answer 1

1.The correct answer is option c.

Role of telomerase in DNA replication is catalyzing the lengthening of the ends of linear chromosomes.Telomerase adds complementary RNA bases to 3' end of the DNA strand.

Okazaki fragments are joined together by DNA ligase.

Primase helps in the synthesis of short RNA segment called Primer which is required for DNA replication.

DNA polymerase alpha primase complex helps in the initiation of replication at Ori.

2.The correct answer is option D.

RNA polymerase can initiate RNA synthesis without a primer,but DNA polymerase requires an RNA primer.

Both DNA and RNA polymerases use DNA as template.

Both DNA and RNA polymerases need to separate the two strands of DNA before replication and transcription respectively.

Both DNA and RNA polymerases use single stranded DNA template.