Entry Test MCQ :: Chromosome and DNA
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| 21. |
In prokaryotes there are |
| A. |
Three types of DNA polymerases |
B. |
One type of RNA polymerase |
| C. |
Three types of RNA polymerase |
D. |
Both a and b |
Answer: Option D
Explanation:
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| 22. |
Human cell contains ______ different kinds of tRNA molecules |
Answer: Option C
Explanation:
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| 23. |
In eukaryotes newly synthesized mRNA |
| A. |
Travels a large distance from nucleus to cytoplasm |
B. |
Is directly released into the cytoplasm |
| C. |
Contains a cap and tail |
D. |
Both a and c |
Answer: Option D
Explanation:
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| 24. |
Which 3 codons are nonsense codons? |
| A. |
UAA,UAU,UUA |
B. |
UGA,UAG,UAA |
| C. |
UGG,UGA,UAU |
D. |
UGG,UAA,UAG |
Answer: Option B
Explanation:
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| 25. |
Methionine is specified by |
| A. |
Stop codon |
B. |
AUG |
| C. |
Start codon |
D. |
Both b and c |
Answer: Option D
Explanation:
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| 26. |
In mitochondria UGA is/specifies as |
| A. |
Stop codon |
B. |
Tryptophan |
| C. |
Initiation codon |
D. |
Methionine |
Answer: Option B
Explanation:
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| 27. |
Three nucleotide sequence on tRNA that specifies an amino acis is |
| A. |
Codon |
B. |
Anticodon |
| C. |
Nonsense codon |
D. |
Genetic code |
Answer: Option B
Explanation:
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| 28. |
Initiation complex in translation is composed of |
| A. |
Ribosome and aminoacyl-tRNA |
B. |
Ribosome and tRNA |
| C. |
tRNA and aminoacyl-tRNA |
D. |
None of these |
Answer: Option A
Explanation:
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| 29. |
Examples of chromosomal aberrations are |
| A. |
Sickle cell anemia |
B. |
Phenylketonuria |
| C. |
Down's syndrome |
D. |
Both a and b |
Answer: Option D
Explanation:
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| 30. |
Point mutations are represented as |
| A. |
Presence of an extra chromosome |
B. |
Loss of chromosome |
| C. |
Alteration in sequence of DNA nucleotide |
D. |
Insertions and inversion of genes |
Answer: Option C
Explanation:
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