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- Question
Which of the following has been used as an evidence that primitive life forms lacked both DNA and enzymes?
Options- A. RNA can both code genetic information and act as a catalyst
- B. DNA and enzymes are only present in the most advanced cells
- C. Advanced cells lack RNA
- D. All of the above
- Correct Answer
- RNA can both code genetic information and act as a catalyst
- 1. In prokaryotes, AUG encodes
Options- A. methionine
- B. N-formyl methionine
- C. a stop codon
- D. alanine Discuss
- 2. The genetic code is degenerated. Which of the following codons represents the principle of degeneracy?
Options- A. UAA and UAC
- B. AUG and AUA
- C. CAU and CAC
- D. UUA and UUC Discuss
- 3. Bacterial protein called catabolic activator protein (CAP) is an example of
Options- A. negative control of gene expression
- B. positive control of gene expression
- C. second type of positive control of gene expression
- D. none of the above Discuss
- 4. The sequence of one strand of DNA is: 5' ATTGCCA 3', what is the sequence of the other strand?
Options- A. 5' TAACGGT 3'
- B. 5' TGGCAAT 3'
- C. 5' ATTGCCA 3'
- D. 5' UAAGCCU3' Discuss
- 5. Translation begins
Options- A. at the replication fork
- B. on the lagging strand
- C. at the start codon
- D. in nucleus Discuss
- 6. The codons which do not specify an amino acid are called
Options- A. initiation code
- B. termination code
- C. propagation code
- D. none of these Discuss
- 7. AUG codes for methionine act as a
Options- A. initiation code
- B. elongation code
- C. termination code
- D. propagation code Discuss
- 8. 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
- 9. 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
- 10. 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
Genetic Code and Regulation problems
Search Results
Correct Answer: N-formyl methionine
Correct Answer: CAU and CAC
Correct Answer: second type of positive control of gene expression
Correct Answer: 5' TGGCAAT 3'
Correct Answer: at the start codon
Correct Answer: termination code
Correct Answer: initiation code
Correct Answer: the initiating amino acid is N- formyl methionine
Correct Answer: differs from that used in prokaryotes
Correct Answer: In vitro synthesis of a polypeptide using UUUUU
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