Genetic Code MCQs : Here you will find MCQ Questions related to "Genetic Code" in Molecular Biology. These Genetic Code MCQ Questions Will help you to improve your Molecular Biology knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations.
Question 1
____________ is the set of rules used by living cells to translate information encoded within genetic material (DNA or mRNA sequences of nucleotide triplets, or codons) into proteins.
A. ribosome
B. genetic code
C. messenger RNA
D. None of the above
View Answer
Ans : B
Explanation: The genetic code is the set of rules used by living cells to translate information encoded within genetic material (DNA or mRNA sequences of nucleotide triplets, or codons) into proteins
Question 2
In which year, the first stable semisynthetic organism was created?
A. 2010
B. 2013
C. 2016
D. 2019
View Answer
Ans : C
Explanation: In 2016 the first stable semisynthetic organism was created. It was a (single cell) bacterium with two synthetic bases (called X and Y). The bases survived cell division.
Question 3
Stop codons are also called?
A. termination
B. nonsense
C. Both A and B
D. umber
View Answer
Ans : C
Explanation: The three stop codons have names: UAG is amber, UGA is opal (sometimes also called umber), and UAA is ochre. Stop codons are also called "termination" or "nonsense" codons.
Question 4
The genetic code is highly similar among all organisms and can be expressed in a simple table with 64 entries
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, The genetic code is highly similar among all organisms and can be expressed in a simple table with 64 entries
Question 5
Which of the following is not a feature of the genetic code?
A. Triplet
B. Degenerate
C. Non – overlapping
D. Ambiguous
View Answer
Ans : D
Explanation: The genetic code is non – ambiguous. This means that there is no ambiguity about a particular codon. A particular code will always code for the same amino acid wherever it is found
Question 6
The codon is a ____________
A. Singlet
B. Duplet
C. Triplet
D. Quadruplet
View Answer
Ans : C
Explanation: The codon is a triplet. Singlet and doublet codes are not enough to code for 20 amino acids. Again in case of a quadruplet codon there will be 256 possible codons which are highly excessive. Triplet codon thus is the minimum requisite having 64 possible codons
Question 7
Which of the following is not a chain termination codon?
A. UAA
B. UCC
C. UFF
D. UGG
View Answer
Ans : D
Explanation: The universal chain termination codons are UAA, UAG and UGA. UGG codes for tryptophan according to the universal genetic code.
Question 8
The first amino acid added by the tRNA is added to the anticodon ____________
A. AUG
B. UAC
C. ACG
D. PCE
View Answer
Ans : B
Explanation: The first amino acid added is methionine which is coded by the codon AUG. Thus, the anticodon for this codon in the tRNA is UAC.
Question 9
The mitochondrial genome has _____________ stop codons
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : D
Explanation: The mitochondrial genome has 4 stop codons. They are UAA, UAG, AGA and AGG. But the universal code has 3 stop codons that are UAA, UAG and UGA
Question 10
Degeneracy is the redundancy of the genetic code.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Degeneracy is the redundancy of the genetic code. This term was given by Bernfield and Nirenberg.