Quiz 6: Topic 6 - Expression of Biological Info.

If the sequence of bases along one side of a DNA molecule is 3’-AAGCT-5’, then the complementary sequence of bases on the other side of the DNA molecule is …

• 3’-AAGCT-5’

• 3’-GGTAC-5’

• 5’-UUCGA-3’

• 5’-TTCGA-3’

In the Meselson-Stahl experiment, it was confirmed that DNA replication is___________ as was predicted by the Watson and Crick double-helix model.

• conservative

• dispersive

• hybrid

• semiconservative

In DNA replication, the helix is unwound by which type of enzyme?

• topoisomerase

• primase

• DNA polymerase

• helicase

What is the role of DNA polymerase?

• To synthesize a short RNA primer.

• To remove RNA primer and fills the gaps with RNA nucleotides.

• To elongate the strand by adding new deoxyribonucleotides one by one from the nucleoplasm.

• To join the Okazaki fragments to form a lagging strand.

Synthesis of a new DNA strand usually begins with

• A RNA primer

• A DNA primer

• An Okazaki fragment

• A DNA ligase

The information carried by DNA is incorporated in a code specified by the:

• Phosphodiester bonds of the DNA strand.

• Number of separate strands of DNA.

• Size of a particular chromosome.

• Specific nucleotide sequence of the DNA molecule.

During DNA replication, enzymes needed in the process are

• RNA polymerase

• DNA polymerase

• Topoisomerase

• Peptidyl transferase

The role of topoisomerase in DNA replication is

• To stabilize the helical structure

• To unwind the double helix

• To form a new DNA leading strand

• To form the Okazaki fragment

Which of the following are the CORRECT base pairs of complementary DNA strands?

• A – T, C – G

• G – C, T – A

• C – T, A – G

• A – U, A – T

Transcription is the transfer of genetic codes from a DNA molecule to …

• an RNA molecule.

• a sequence of amino acids in a protein molecule.

• a second DNA molecule.

• a ribosomal subunit.