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Molecular Basis of Inheritance Class 12 mcq. We covered all the Molecular Basis of Inheritance Class 12 mcq in this post for free so that you can practice well for the exam.
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mcq on Molecular Basis of Inheritance for Students
Which gene in the lac operon is responsible for producing ß-galactosidase?
a. z gene
b. a gene
c. i gene
d. y gene
Option a – z gene
In bacteria, which enzyme carries out the transcription of all RNA types?
a. DNA-dependent DNA polymerase
b. RNA-dependent DNA polymerase
c. DNA-dependent RNA polymerase
d. RNA-dependent RNA polymerase
Option c – DNA-dependent RNA polymerase
Which statement about repetitive DNA is incorrect?
a. They exhibit significant polymorphism
b. Used in resolving paternity disputes
c. Directly involved in coding for proteins
d. Essential in DNA fingerprinting
Option c – Directly involved in coding for proteins
Which is an example where DNA fingerprinting is useful?
a. Forensic investigations
b. Studying Population variation
c. Assessing genetic diversity
d. All of the above
Option d – All of the above
DNA replication is described as
a. Conservative
b. Continuous
c. Semi-conservative
d. Complementary
Option c – Semi-conservative
Which enzyme halts the transformation process?
a. Protease
b. DNase
c. RNase
d. All of the above
Option b – DNase
What ends translation by binding to the stop codon?
a. Initiation factor
b. Sigma factor
c. Methyl guanosine triphosphate
d. Release factor
Option d – Release factor
What contributes to the structural stability of DNA?
a. Base stacking
b. Hydrogen Bonding
c. Presence of 2’-OH group
d. Both a and b
Option d – Both a and b
Which of these functions as a ribozyme?
a. 5S rRNA
b. snRNA
c. 23S rRNA
d. hnRNA
Option c – 23S rRNA
After shifting E. coli from 15N to 14N, in which generation is the hybrid DNA band observed?
a. First generation
b. Second generation
c. Third generation
d. Fourth generation
Option a – First generation
The untranslated regions (UTRs) in mRNA are found
a. Within the coding region
b. Between start and stop codons
c. Only at the 5′ end
d. At both 5′ and 3′ ends
Option d – At both 5′ and 3′ ends
Choose the incorrect statement regarding the Hershey-Chase experiment.
a. Viruses were cultured in radioactive S or P
b. Radioactive phages infected E. coli
c. Bacterial coats were removed enzymatically
d. Radioactive sulfur was found in the supernatant
Option c – Bacterial coats were removed enzymatically
Which statement is accurate regarding DNA?
a. It codes directly for proteins
b. More reactive than RNA
c. It is the preferred Molecule for storing genetic material
d. Contains a 2’-OH group
Option c – It is the preferred Molecule for storing genetic material
DNA polymerase synthesizes DNA discontinuously along which template direction?
a. 5′ to 3′
b. 3′ to 5′
c. 2′ to 5′
d. Either 5′ to 3′ or 3′ to 5′
Option a – 5′ to 3′
Assertion: Viruses evolve faster than DNA molecules.
Reason: This is because their genetic material is RNA.
a. Both statements are true, and the reason explains the assertion
b. Both statements are true, but the reason doesn’t explain the assertion
c. Assertion is true, reason is false
d. Both statements are false
Option a – Both statements are true, and the reason explains the assertion
If 5′-AUGCCAUGCUG-3′ is an mRNA sequence, what is the correct coding DNA strand?
a. 5′-TACGGTACGAC-3′
b. 5′-ATGCCATGCTG-3′
c. 3′-ATGCCATGCTG-5′
d. 3′-CAGCATGGCAT-5′
Option b – 5′-ATGCCATGCTG-3′
Which step can RNA polymerase carry out independently during transcription?
a. Initiation
b. Elongation
c. Termination
d. All of the above
Option b – Elongation
Choose the incorrect statement regarding genetic code mutations.
a. Adding a Base results in a frameshift mutation
b. Removing 14 Bases shifts the reading frame
c. Inserting 7 Bases alters the reading pattern
d. Deleting 5 codons changes the reading frame
Option d – Deleting 5 codons changes the reading frame
Read the statements and choose the correct option:
Statement I: Chromatin is the stained thread-like structure in the nucleus.
Statement II: Euchromatin is the inactive form of chromatin.
a. Only Statement I is correct
b. Only Statement II is correct
c. Both statements are correct
d. Both statements are incorrect
Option a – Only Statement I is correct
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