6.1-6.3 QUIZ AP BIO

In DNA replication, DNA "unwinds" to form two template strands: the leading strand and the lagging strand.

Which of the following statements about these strands is true?

• The leading strand of DNA is synthesized continuously.

• DNA polymerase can only synthesize DNA on the leading strand.

• Okazaki fragments are used to synthesize the leading strand of DNA.

• The lagging strand can only be synthesized once the leading strand has been completed.

A template strand of DNA is 3′ TAGGCATTGCA 5′.

What is the complementary DNA strand that is created from this template during replication?

• 5′ TGCAATGCCTA 3′

• 5′ TAGGCATTGCA 3′

• 5′ AUCCGUAACGU 3′

• 5′ ATCCGTAACGT 3′

Which of the following statements best explains the mechanism for DNA replication?

• DNA replication is reductive, because only half the total DNA present is copied.

• DNA replication is semi-conservative, because each DNA strand serves as a template during replication.

• DNA replication is dispersive, because the two daughter DNA molecules have mixtures of parent and daughter DNA in one strand.

• DNA replication is conservative, because parent DNA strands stay together and the daughter DNA strands as another group..

Which bonds hold the nitrogen bases together?

• hydrogen bonds

• covalent bonds

• ionic bonds

• phosphates

Before DNA polymerase III can begin its job, what must happen first?

• Primase lays down RNA primers.

• Primase lays down thymine and cytosine.

• DNA polymerase doesn’t need any help to start up the process.

• Ligase needs to glue together the nucleotides.

The lagging strand is composed of segments known as _____.

• Okazaki fragments

• RNA primers

• Nitrogen bases

• Replication fork

What is pictured here in the DNA replication process?

• replication fork

• leading strand

• lagging strand

• ligase

This picture is illustrating the ____ nature of DNA.

• anti-parallel
• deoxyribosic
• helical
• radioactive

3' and 5' refer to...

• How effectively the helicase works
• What direction the nucleotides are pointing
• Where the RNA primer attaches
• Okazaki's famous experiment

Which of the following units are repeatedly joined together to form a strand of DNA?

• amino acids
• nucleotides
• fatty acids
• polysaccharides