AP Biology Unit 6 Topic 1, 2 and 3

How does the DNA in a prokaryote differ from a eukaryote?

• Prokaryote has circular DNA, Eukaryotes has linear DNA

• Prokaryote has single stranded DNA, Eukaryotes has double stranded DNA

• Prokaryote has linear DNA, Eukaryotes has prokaryote DNA

• Prokaryote has double stranded DNA, Eukaryotes has single stranded DNA

Both eukaryotes and prokaryotes have plasmids. What are plasmids?

• large extra-chromosomal, double-stranded, linear DNA molecules

• large extra-chromosomal, double-stranded, circular DNA molecules

• small extra-chromosomal, double-stranded, circular DNA molecules

• small extra-chromosomal, double-stranded, linear DNA molecules

Identify which of the following best describes purines and pyrimidines.

• Purines (C, T, & U) have single ring, Pyrimidines (A & G) have double ring

• Purines (C, T, & U) have double ring, Pyrimidines (A & G) have single ring

• Purines (A & G) have single ring, Pyrimidines (C, T, & U) have double ring

• Purines (A & G) have double ring, Pyrimidines (C, T, & U) have single ring

Which of the following demonstrates base pairing rules to 5' - CAGGT - 3'

• 3' - TGGAC - 5'

• 3' - GTCCA - 5'

• 5' - GTCCA - 3'

• 5' - CAGGT - 3'

Which enzyme is responsible for relaxing supercoiling in front of the replication fork?

• helicase

• DNA polymerase

• topoisomerase

• ligase

Which enzyme is responsible for unwinding the DNA strands?

• helicase

• DNA polymerase

• topoisomerase

• ligase

Which enzyme is requires RNA primers to initiate DNA synthesis?

• helicase

• DNA polymerase

• topoisomerase

• ligase

Which enzyme is responsible for joining the fragments on the lagging strand?

• helicase

• DNA polymerase

• topoisomerase

• ligase

Describe the difference between the synthesis of the leading and lagging strands.

• directionality: leading = 3' -> 5', lagging = 5' -> 3'

• synthesis continuity: leading = discontinuous & lagging = continuous

• directionality: leading = 5' -> 3', lagging = 3' -> 5'

• synthesis continuity: leading = continuous & lagging = discontinuous

How do the three types of RNA work together?

• mRNA carries message, tRNA carries amino acids, and rRNA makes ribosome

• mRNA makes ribosomes, tRNA carries amino acids, and rRNA relays information

• mRNA carries amino acids, tRNA transfer message, and rRNA makes ribosome

• mRNA is made, tRNA holds the DNA in place, and rRNA removes the deoxyribose