Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Cellular and Molecular Biology


1. What is the Best evidence that genes encode the amino acid sequence of proteins?
a) proteins are macromolecules
b) The amino acid sequence of polypeptide is changed by gene mutation
c) DNA serves as a template for RNA
d)mRNA is found in the ribosome

2. Which is not a characteristic of proteins?
a) waxes
b)albumins
c) carotenoids
d)Lecithin

3. The tRNA anticodon for the amino acid valine is CAA(reading 3’ to 5’). What is the mRNA codon for valine (reading 5’ to 3’)
a) TTG
b) GGU
c) CCA
d) UGG

4. The basis for the pairing of the two strand of DNA in the double helix is
Multiple Choice Questions on Cellular and Molecular Biology
a) covalent bonding
b) hydrogen bonding
c) hydrophobic interaction  
d) tertiary structure

5. Which of the following statements about the Krebs cycle is not true?
a) The Krebs cycle is linked to glycolysis by pyruvate
b) The Krebs cycle produces nucleotides such as NADH and FADH2
c) Citrate is an intermediate in the Krebs cycle
d) The Krebs cycle is the single greatest source of ATP in the cell

6. Which of the flowing is a correct association?
a)Polysome: group of Golgi complexes
b)Ribosome: electron transport chain
c)Lysosome: digestive enzyme for intracellular use
d)Mitochondria: transport materials from the nucleus to the cytoplasm

7. Which of the following statements about viruses is not true?
a)The protein coat of the virus does not enter a host bacterial cell
b)Their genetic material may be DNA or DNA
c)The virus may replicate in a bacterial host
d)The virus may replicate autonomously in the absence of a host

8.  Cells  that involved in active transport such as cells of the intestinal epithelium, utilize large quantities of ATP. In such cells, there are
a)many polyribosomes
b)many mitochondria
c)many lysosomes
d) high level of adenylate cyclise activity

9.  Which of the following statements regarding photosynthesis is not true?
a)The light cycle occurs only during exposure to light.
b)Red and blue are optimal for photosynthetic function
c)ATP is produced during the light cycle.
d)The dark cycle occurs only in the absence of light.

10. Which of the following process utilizes proofreading to increase its accuracy?
 a)transcription
b)DNA replication
c)recombination
d)electron transport
Answers
1. b) The amino acid sequence of polypeptide is changed by gene mutation
2. b)albumins
3. b) GGU
4. b) hydrogen bonding
5. d) The Krebs cycle is the single greatest source of ATP in the cell
6. c)Lysosome: digestive enzyme for intracellular use
7. d)The virus may replicate autonomously in the absence of a host
8. b)many mitochondria
9. d)The dark cycle occurs only in the absence of light.
10. b)DNA replication

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