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GENETIC CODE and REGULATION Online Test and Answers Pdf Download :-
These are very useful & Most Asked Questions in your certification Exam. Read all Online Mock Test Exam Question Bank for Beginners Freshers & Experienced.
1. Which of the following techniques was carried out by Nirenberg and Matthaei in 1961 to determine the first codon?
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
Answer: A
2. Bacterial protein called catabolic activator protein (CAP) is an example of
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
Answer: C
3. How many different codons are possible?
A. 3
B. 20
C. 64
D. An infinite number
Answer: C
4. The genetic code is
A. universal
B. universal except for rare exceptions in mitochondria and some protozoa
C. species-specific
D. kingdom-specific
Answer: B
5. Which of the following has been used as an evidence that primitive life forms lacked both DNA and enzymes?
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
Answer: A
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?
A. Gel electrophoresis
B. Density gradient centrifugation
C. Frameshift mutagenesis
D. Restriction digests of the rII gene
Answer: C
7. Codon that specify the amino acids often differs in the
A. first base
B. second base
C. third base
D. none of these
Answer: C
8. In some organelles in eukaryotes, the genetic code for some codons
A. differs from that used in prokaryotes
B. are same
C. are partially same
D. none of the above
Answer: A
9. The codons which do not specify an amino acid are called
A. initiation code
B. termination code
C. propagation code
D. none of these
Answer: B
10. The genetic code is degenerated. Which of the following codons represents the principle of degeneracy?
A. UAA and UAC
B. AUG and AUA
C. CAU and CAC
D. UUA and UUC
Answer: C
GENETIC CODE and REGULATION Objective type Questions with Answers
11. The sequence of one strand of DNA is: 5′ ATTGCCA 3′, what is the sequence of the other strand?
A. 5′ TAACGGT 3′
B. 5′ TGGCAAT 3′
C. 5′ ATTGCCA 3′
D. 5′ UAAGCCU3′
Answer: B
12. In prokaryotes, AUG encodes
A. methionine
B. N-formyl methionine
C. a stop codon
D. alanine
Answer: B
13. How many amino acids will be encoded by 5′ GAU GGU UGA UGU 3′ sequence?
A. One
B. Two
C. Three
D. Four
Answer: B
14. In protein synthesis in prokaryotes
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
Answer: A
15. AUG codes for methionine act as a
A. initiation code
B. elongation code
C. termination code
D. propagation code
Answer: A