Structure of DNA and RNA - Case Studies
Q. What is the expected phenotypic ratio in a monohybrid cross?
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A.
3:1
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B.
1:2:1
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C.
9:3:3:1
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D.
1:1
Solution
The expected phenotypic ratio in a monohybrid cross is 3:1 for dominant to recessive traits.
Correct Answer: A — 3:1
Q. Which base is found in RNA but not in DNA?
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A.
Thymine
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B.
Uracil
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C.
Cytosine
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D.
Adenine
Solution
RNA contains uracil instead of thymine, which is found in DNA.
Correct Answer: B — Uracil
Q. Which of the following is a characteristic of RNA compared to DNA?
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A.
Double-stranded structure
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B.
Deoxyribose sugar
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C.
Single-stranded structure
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D.
Thymine base
Solution
RNA is typically single-stranded, while DNA is double-stranded.
Correct Answer: C — Single-stranded structure
Q. Which of the following mutations does NOT change the amino acid sequence?
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A.
Missense mutation
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B.
Nonsense mutation
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C.
Silent mutation
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D.
Frameshift mutation
Solution
A silent mutation does not change the amino acid sequence due to the redundancy of the genetic code.
Correct Answer: C — Silent mutation
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