Molecular Genetics MCQs part 1

1. In a nucleotide, the nitrogen base is joined to the sugar molecule by

• Phosphodiester bond
• Glycosidic bond
• Hydrogen bond
• (a) & (b)

2. If a double stranded DNA has 20% Thymine, the percentage of Guanine in the DNA

• 30%
• 10%
• 90%
• 40%

3.If a DNA contains 1000 base pairs, what would be its length?

• 3400 Å
• 34000 Å
• 6800 Å
• 1000 Å

4. What is not True for DNA in prokaryotes

• present in the form of a compact structure called nucleoid
• the coils are maintained by non-histone basic proteins
• found in cytoplasm in a supercoiled condition
• packaged as nucleosomes along with histones

5. Pick the right difference between a DNA and RNA

• Sugar and phosphate
• sugar and purines
• purines and phosphate
• sugar and pyrimidines

6. In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Assertion: In Griffith’s experiment mice were injected by a mixture of heat killed Smooth type bacteria and live Rough type bacteria. Some mice died of pneumonia and their blood contained both live Rough type bacteria and live Smooth type bacteria.
Reason: The dead Smooth type bacteria became alive and caused pneumonia. Griffith named it as transforming principle.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion, then mark (a)
• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (b)
• If Assertion is true but Reason are false, then mark (c)
• If both Assertion and Reason are false, then mark (d)

7. Hershey and Chase experiment proving DNA as the genetic material was based on the principle

• Transduction
• transformation
• transcription
• translation

8. A bacterial colony containing DNA made up of 100% N15 nitrogen bases is allowed to replicate in a medium containing N14 bases. After one round of replication the result would be

• All individuals will be identical to parents
• All individuals will be hybrids
• Only 50% individuals would be hybrids
• All individuals would have DNA made up of 100% N¹⁴

9. Teminism is

• a central dogma reverse
• a central dogma of molecular biology
• a circular flow of hereditary material
• an effect of cytoplasm on functioning of DNA

10. Cistron is

• The coding sequence of DNA
• The functional unit of DNA molecule that codes for a particular gene product
• Intervening non coding sequence of DNA
• The sequences which are removed during RNA splicing

Score =

Correct answers:

Molecular Genetics MCQs Parts => 1..

Share this

AEI Online Tutor