Final Question: Quiz 14

A eukaryotic transcription unit (a gene?) that is 8,000 nucleotides long may use 1,200 nucleotides to make a protein consisting of approximately 400 amino acids. This is best explained by the fact that a. many noncoding stretches of nucleotides are present in eukaryotic DNA b. there is redundancy and ambiguity in the genetic code c. many nucleotides are needed to code fore each amino acid d. nucleotides break off and are lost during the transcription process

A

A mutation results in a defective enzyme A. Which of the following would be a consequence of that mutation? a. An accumulation of A and no production of B and C b. An accumulation of A and B and no production of C c. An accumulation of B and no production of A and C d. An accumulation of B and C and no production of A

A

A particular triplet of bases in the template of DNA is 5' AGT 3'. The corresponding codon for the mRNA transcribed is a. 3' UCA 5' b. 3' UGA 5' C. 5' TCA 3' d. 3' ACU 4'

A

RNA polymerase moves in which direction along the DNA a. 5' to 3' along whichever strand it's on b. 3' to 5' along the template strand c. 5' to 3' alone the template strand d. 5' to 3' along the double stranded DNA

B

What is a ribozyme? a. an enzyme that uses RNA as a substrate b. an RNA with enzymatic activity c. an enzyme that catalyzes that association between the large and small ribosomal subunits d. an enzyme that synthesizes RNA as part of the transcription process

B

What is the function of the release factor (RF)? a. it separates tRNA in the A site from the growing polypeptide b. It binds to the stop codon in the A site in place of a tRNA. c. It release the amino acid from its tRNA to allow the amino acid to form a peptide bond. d. it supplies a source of energy for termination of translation

B

According to Beadle and Tatum's hypothesis, how many genes are necessary for this pathway? a. 0 b. 1 c. 2 d. 3

C

In eukaryotes there are several different type of RNA polymerase. Which type is involved in a transcription of mRNA for a globin protein? a. ligase b. RNA polymerase c. RNA polymerase II d. RNA polymerase III

C

the nitrogenous base adenine is found in all members of which group? a. proteins, triglycerides, and testosterone b. protein, ATP, and DNA c. ATP, RNA, and DNA d. a glucose, ATP, and DNA

C

A particular triplet of base in the coding sequence of DNA is AAA. The anticodon on that binds the mRNA codon is a. TTT b. UUA c. UUU d. AAA

D

Which of the following provides some evidence that RNA probably evolved before DNA? a. RNA polymerase uses DNA as a template b. RNA polymerase makes a single-stranded molecule c. RNA polymerase doesn't not require localized unwinding of the DNA d. DNA polymerase uses a primer, usually made of RNA.

D

Why might a point mutation in DNA make a difference in the level of a protein's activity? a. It might result in a chromosomal translocation b. It might exchange one stop codon for another stop codon c. It might exchange one serine codon for a difference serine codon d. it might substitution a different amino acid in the active site

D

A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be a. 5' TTG-CTA-CAG-TAG 3' b. 3' AAC-GAC-GUC-AUA 5' c. 3' AAA-AAT-ATA-ACA 5' d. 3' AAA-GAA-TAA-CAA 5'

D.