Q. What is the basic building block of DNA?
-
A.
Amino acid
-
B.
Nucleotide
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C.
Fatty acid
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D.
Monosaccharide
Solution
DNA is composed of nucleotides, which are the basic building blocks.
Correct Answer:
B
— Nucleotide
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Q. What is the complementary base pair for adenine in DNA?
-
A.
Thymine
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B.
Cytosine
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C.
Guanine
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D.
Uracil
Solution
In DNA, adenine pairs with thymine through hydrogen bonds.
Correct Answer:
A
— Thymine
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Q. What type of RNA carries the genetic information from DNA to the ribosome?
-
A.
tRNA
-
B.
rRNA
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C.
mRNA
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D.
snRNA
Solution
mRNA (messenger RNA) carries genetic information from DNA to the ribosome for protein synthesis.
Correct Answer:
C
— mRNA
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Q. Which of the following bases is NOT found in RNA?
-
A.
Adenine
-
B.
Cytosine
-
C.
Thymine
-
D.
Uracil
Solution
Thymine is found in DNA, while RNA contains uracil instead.
Correct Answer:
C
— Thymine
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Q. Which of the following describes the antiparallel nature of DNA strands?
-
A.
Both strands run in the same direction
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B.
Strands run in opposite directions
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C.
Strands are identical
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D.
Strands are circular
Solution
The antiparallel nature of DNA means that the two strands run in opposite directions.
Correct Answer:
B
— Strands run in opposite directions
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Q. Which of the following is a purine base?
-
A.
Cytosine
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B.
Thymine
-
C.
Adenine
-
D.
Uracil
Solution
Adenine is a purine base, while cytosine, thymine, and uracil are pyrimidines.
Correct Answer:
C
— Adenine
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Q. Which structure represents the double helix of DNA?
-
A.
Single strand
-
B.
Triple helix
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C.
Double helix
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D.
Circular structure
Solution
The double helix is the characteristic structure of DNA, consisting of two intertwined strands.
Correct Answer:
C
— Double helix
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