Discussion
Home ‣ Biochemistry ‣ Genetic Code and Regulation Comments
- Question
How many different codons are possible?
Options- A. 3
- B. 20
- C. 64
- D. An infinite number
- Correct Answer
- 64
- 1. How many amino acids will be encoded by 5' GAU GGU UGA UGU 3' sequence?
Options- A. One
- B. Two
- C. Three
- D. Four Discuss
- 2. Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
Options- A. In vitro synthesis of a polypeptide using UUUUU
- B. Labeled peptide binding to a ribosome
- C. Mixed co-polymer mRNA synthesis
- D. none of the above Discuss
- 3. In some organelles in eukaryotes, the genetic code for some codons
Options- A. differs from that used in prokaryotes
- B. are same
- C. are partially same
- D. none of the above Discuss
- 4. In protein synthesis in prokaryotes
Options- A. the initiating amino acid is N- formyl methionine
- B. the initiating amino acid is methionine
- C. the initiating amino acid is phenyl alanine
- D. none of the above Discuss
- 5. AUG codes for methionine act as a
Options- A. initiation code
- B. elongation code
- C. termination code
- D. propagation code Discuss
- 6. Codon that specify the amino acids often differs in the
Options- A. first base
- B. second base
- C. third base
- D. none of these Discuss
- 7. Crick demonstrated that the genetic code involved three bases and suggested that the code was degenerated. What experimental technique Crick conducted to suggest genetic code degeneration?
Options- A. Gel electrophoresis
- B. Density gradient centrifugation
- C. Frameshift mutagenesis
- D. Restriction digests of the rII gene Discuss
- 8. The genetic code is
Options- A. universal
- B. universal except for rare exceptions in mitochondria and some protozoa
- C. species-specific
- D. kingdom-specific Discuss
- 9. Upstream regions which are essential for correct transcription are called
Options- A. enhancers
- B. start codons
- C. promoters
- D. transcription factors Discuss
- 10. Immediately after transcription
Options- A. a methylated guanine cap is added to the 51 end of the transcript
- B. a methylated guanine cap is added to the 31 end of the transcript
- C. both (a) and (b)
- D. a poly adenylation signal is added Discuss
Genetic Code and Regulation problems
Search Results
Correct Answer: Two
Correct Answer: In vitro synthesis of a polypeptide using UUUUU
Correct Answer: differs from that used in prokaryotes
Correct Answer: the initiating amino acid is N- formyl methionine
Correct Answer: initiation code
Correct Answer: third base
Correct Answer: Frameshift mutagenesis
Correct Answer: universal except for rare exceptions in mitochondria and some protozoa
Correct Answer: promoters
Correct Answer: a methylated guanine cap is added to the 51 end of the transcript
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