Genetic Code And Regulation(Biochemistry ) Questions and Answers
Question 1. Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
None of these
In vitro synthesis of a polypeptide using UUUUU
Labeled peptide binding to a ribosome
Mixed co-polymer mRNA synthesis
Explanation:-
Answer: Option B. -> In vitro synthesis of a polypeptide using UUUUU
Question 2. Bacterial protein called catabolic activator protein (CAP) is an example of
negative control of gene expression
positive control of gene expression
second type of positive control of gene expression
None of these
Explanation:-
Answer: Option C. -> second type of positive control of gene expression
Question 3. How many different codons are possible?
20
3
An infinite number
64
Explanation:-
Answer: Option D. -> 64
Question 4. Which of the following has been used as an evidence that primitive life forms lacked both DNA and enzymes?
Advanced cells lack RNA
DNA and enzymes are only present in the most advanced cells
RNA can both code genetic information and act as a catalyst
All of these
Explanation:-
Answer: Option C. -> RNA can both code genetic information and act as a catalyst
Question 5. The genetic code is
universal
species-specific
kingdom-specific
universal except for rare exceptions in mitochondria and some protozoa
Explanation:-
Answer: Option D. -> universal except for rare exceptions in mitochondria and some protozoa
Question 6. 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?
Frameshift mutagenesis
Gel electrophoresis
Density gradient centrifugation
Restriction digests of the rII gene
Explanation:-
Answer: Option A. -> Frameshift mutagenesis
Question 7. In some organelles in eukaryotes, the genetic code for some codons
None of these
are partially same
are same
differs from that used in prokaryotes
Explanation:-
Answer: Option D. -> differs from that used in prokaryotes
Question 8. The codons which do not specify an amino acid are called
initiation code
termination code
propagation code
none of these
Explanation:-
Answer: Option B. -> termination code
Question 9. The genetic code is degenerated. Which of the following codons represents the principle of degeneracy?
AUG and AUA
UUA and UUC
CAU and CAC
UAA and UAC
Explanation:-
Answer: Option C. -> CAU and CAC
Question 10. Codon that specify the amino acids often differs in the