BIO TEST

Which of the following statements about the 5' end of a polynucleotide strand of DNA is correct?

• The 5' end has a hydroxyl group attached to the number 5 carbon

• The 5' end has a phosphate group attached to the number 5 carbon

• The 5' end has thymine attached to the number 5 carbon

• The 5' end has a carboxyl group attached to the number 5 carbon

• The 5' end is the fifth position of one of the nitrogenous bases

In eukaryotes, what is the DNA wrapped around?

• single-standed binding proteins

• sliding clamp

• polymerase

• histones

Meselson and Stahl's experiments proved that DNA replicates by which mode?

• conservative

• semi-conservative

• dispersive

• none of the above

Which of the following components is not involved during the formation of the replication fork?

• single-stranded binding proteins

• helicase

• origin of replication

• ligase

Which of the following does the enzyme primase synthesize?

• DNA primer

• RNA primer

• Okazaki fragments

• phosphodiester linkage

Which direction does DNA replication take place?

• 5'-3'

• 3'-5'

• 5'

• 3'

The ends of the linear chromosomes are maintained by

• helicase

• primase

• DNA pol

• Telomerase

The RNA components of ribosomes are synthesized in the

• cytoplasm

• nucleus

• nucleolus

• endoplasmic reticulum

Draw on the replication fork and label: leading and lagging strands, 5' and 3' ends, helicase, single-stranded binding proteins, topoisomerase, primase, DNA polymerase III, DNA polymerase I, DNA ligase, and Okazaki fragments

Define the function of the following:

Helicase