Protein Synthesis problems
- 1. The anticodon of tRNA
Options- A. binds to rRNA
- B. binds to an amino acid
- C. binds to the Shine Dalgarno sequence
- D. binds to an mRNA codon Discuss
Correct Answer: binds to an mRNA codon
- 2. Translation in prokaryotes begins by the formation of a 30S initiation complex between the
Options- A. 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
- B. 30S ribosomal subunit, tRNA and initiation factors
- C. 30S ribosomal subunit and mRNA only
- D. 30S ribosomal subunit, mRNA and initiation factors Discuss
Correct Answer: 30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
- 3. The pathway of a tRNA during polypeptide elongation on the ribosome is
Options- A. A site ? P site ? E site
- B. P site ? entry site ? exit site
- C. A site ? P site ? entry site
- D. P site ? A site ? E site Discuss
Correct Answer: A site ? P site ? E site
- 4. Proteins contain __________ different amino acids, whereas DNA and RNA are composed of __________ different nucleotides
Options- A. 20,64
- B. 3,20
- C. 4,20
- D. 20,4 Discuss
Correct Answer: 20,4
- 5. The first step in translation is
Options- A. binding of the two ribosomal subunits to each other
- B. binding of mRNA to the two ribosomal subunits
- C. binding of tRNA to the small ribosomal subunit
- D. binding of mRNA to the small ribosomal subunit Discuss
Correct Answer: binding of mRNA to the small ribosomal subunit
- 6. Which of the following RNAs bind to an amino acid?
Options- A. mRNA
- B. tRNA
- C. rRNA
- D. hnRNA Discuss
Correct Answer: tRNA
- 7. A polysome could be best described as
Options- A. an active site of DNA synthesis.
- B. an active site of protein synthesis.
- C. an active site of lipid synthesis.
- D. all of the above. Discuss
Correct Answer: an active site of protein synthesis.
- 8. On the ribosome, mRNA binds
Options- A. between the subunits
- B. to the large subunit
- C. to the small subunit
- D. none of these Discuss
Correct Answer: to the small subunit
- 9. Type I proteins (plasma membrane) have a
Options- A. cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
- B. cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence
- C. multiple signal sequence and a hydrophobic stop transfer sequence
- D. multiple signal sequence that doubles as the membrane anchoring sequence Discuss
Correct Answer: cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
- 10. Which site of the tRNA molecule binds to the mRNA molecule?
Options- A. Anticodon
- B. Codon
- C. Amino acid
- D. 5 prime end Discuss
Correct Answer: Anticodon
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