Protein Synthesis MCQs : Here you will find MCQ Questions related to "Protein Synthesis" in Molecular Biology. These Protein Synthesis 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
Protein synthesis can be divided broadly into _________ phases.
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : B
Explanation: Protein synthesis can be divided broadly into two phases - transcription and translation
Question 2
During which phase, a section of DNA encoding a protein, known as a gene, is converted into a template molecule called messenger RNA (mRNA).
A. transcription
B. translation
C. Both A and B
D. None of the above
View Answer
Ans : A
Explanation: During transcription, a section of DNA encoding a protein, known as a gene, is converted into a template molecule called messenger RNA (Mrna).
Question 3
Which of the following is not a property of open reading frame?
A. Contiguous
B. Non overlapping
C. Encodes a single protein
D. Starts and ends at either end of the mRNA
View Answer
Ans : D
Explanation: The protein coding region of each mRNA is composed of a contiguous, non-overlapping string of codons called open reading frame. Each ORF specifies a single protein and starts and ends at internal sites within the mRNA and thus have distinct start and stop codons used for translation
Question 4
In order to adopt a functional three-dimensional (3D) shape, the polypeptide chain must first form a series of smaller underlying structures called ?
A. primary structures
B. secondary structures
C. tertiary structures
D. quad structures
View Answer
Ans : B
Explanation: In order to adopt a functional three-dimensional (3D) shape, the polypeptide chain must first form a series of smaller underlying structures called secondary structures.
Question 5
How many reading frames are applicable in case of translation
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : C
Explanation: As the codons are immediately adjacent to each other and because the codons are three nucleotides long, any stretch of mRNA can be translated into three different reading frames. However, once the translation starts the reading frame is fixed as the codons are subsequent to each other
Question 6
Once transcription is complete, the pre-mRNA molecule undergoes post-transcriptional modifications to produce a mature mRNA molecule.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Once transcription is complete, the pre-mRNA molecule undergoes post-transcriptional modifications to produce a mature mRNA molecule.
Question 7
How many double helix regions are observed in a tRNA molecule?
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : D
Explanation: The tRNA molecules consist of 4 double helix regions. They are the acceptor stem and the stem of the three loops, the ΨU loop, D loop and the anticodon loop.
Question 8
How many key classes of post-translational modification?
A. 1
B. 2
C. 3
D. 4
View Answer
Ans : D
Explanation: There are four key classes of post-translational modification: Cleavage, Addition of chemical groups, Addition of complex molecules and Formation of intramolecular bonds
Question 9
How many unusual bases are observed in a tRNA molecule?
A. 3
B. 4
C. 5
D. 6
View Answer
Ans : C
Explanation: Five unusual bases, produced by enzymatic modification of the usual bases, may be observed in a tRNA molecule. These are pseudouridine, dihyrdouridine, hypoxanthine, thymine and methylguanine. Of these five, unusual bases pseudouridine and dihyrdouridine are most commonly found in the tRNA molecules
Question 10
During translation, ribosomes synthesize polypeptide chains from mRNA template molecules
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, During translation, ribosomes synthesize polypeptide chains from mRNA template molecules