1. Which protein releases the tension built up by separating the DNA strands? b.

Question

1. Which protein releases the tension built up by separating the DNA strands? b. DNA gyrase a. DNA helicase c. DNA ligase d. DNA polymerase e. DnaA 2. Bacteria are generally very good at DNA repair, but in environmentally stressful conditions, they can activate a mechanism of adaptive mutation that is called the: a. nucleotide excision pathway d. homologous repair network b. SOS response e. conservative replication process c. spliceosome activation response 3. Which enzyme consists of a protein and an RNA molecule and in involved in extending DNA sequences at the ends of the chromosomes during the production of gametes? a. telomerase b. RNA polymerasec.the spliceosome d.the ribosome e. Dicer 4. Viruses and the F plasmid in E. coli often undergo DNA replication by which method? a. linear replication b. theta replication c. rolling circle replication 5. Which of these small RNAs are involved in recognizing the 5' and 3' splice sites and assisting in catalysis of splicing in the spliceosome? a. miRNAs b. mRNAs c. rRNAs d. snRNAs e. siRNAS 6. What is the function of the -10 and-35 consensus sequences in the promoter? a. position RNA polymerase d. terminate transcription b. enhance transcription e. enhance RNA stability c.promote ribosome binding

Explanation / Answer

1. Option B is correct. DNA gyrase is a kind of topoisomerase which releases tension by preventing negative supercoiling.

2. Option B is correct. SOS response is an adaptive process against DNA damage.

3. Option B is correct. RNA polymerase contains a small segment of RNA and reat are protein. RNA polymerase adds nucleotides during DNA replication.

4. Option C is correct. Rolling circle replication occurs in circular plasmid and also in viruses.

5. Option D is correct.

6. Option A is correct. The particular consensus sequence bind with RNA polymerase.

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