DNA and RNA Review

What bases pair in DNA?

• A–C, G–T

• A–T, C–G

• A–G, T–C

• A–U, C–G

What does 'semi-conservative' replication mean?

• Both strands are newly made

• Each DNA molecule has one original strand and one new strand

• Both original strands are kept intact

• DNA is synthesized only in short fragments

What enzyme unwinds the DNA helix?

• Helicase

• DNA polymerase

• Primase

• Ligase

What molecule does transcription produce?

• mRNA

• tRNA

• rRNA

• DNA

In RNA, adenine (A) pairs with which base?

• Uracil (U)

• Thymine (T)

• Cytosine (C)

• Guanine (G)

mRNA must be spliced to remove what?

• Exons

• Poly-A tail

• Introns

• 5' cap

Codons are groups of how many bases?

• 2

• 3

• 4

• 5

What is the start codon?

• AUG

• UAA

• UAG

• GGG

What is a stop codon?

• AUG

• GCA

• CCC

• UGA

In which molecule is the anticodon found?

• mRNA

• tRNA

• rRNA

• DNA