MCQ Collection
NET Applied Sciences MCQs
Practice NET Applied Sciences questions with answers and explanations.
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Correct Answer: D. Each new molecule contains one parental and one newly synthesized strand
Explanation:
The parental strands separate and serve as templates.
Each completed double helix preserves one original strand.
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Correct Answer: A. Helicase
Explanation:
Helicase breaks hydrogen bonds between base pairs.
It opens the replication fork.
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Correct Answer: B. DNA polymerase
Explanation:
DNA polymerase extends a new strand using a template.
It adds nucleotides in the 5′ to 3′ direction.
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Correct Answer: C. DNA ligase
Explanation:
Ligase seals breaks in the sugar-phosphate backbone.
It creates a continuous lagging strand.
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Correct Answer: D. The DNA strand synthesized continuously toward the replication fork
Explanation:
DNA polymerase can follow the fork continuously on the leading template.
Synthesis still proceeds 5′ to 3′.
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Correct Answer: A. The DNA strand synthesized discontinuously as Okazaki fragments
Explanation:
Its template orientation requires repeated short segments.
Ligase later joins these fragments.
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Correct Answer: B. Synthesis of RNA using a DNA template
Explanation:
RNA polymerase copies one DNA strand into RNA.
In eukaryotes, transcription occurs mainly in the nucleus.
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Correct Answer: C. RNA polymerase
Explanation:
RNA polymerase binds near a gene and builds an RNA strand.
It uses complementary ribonucleotides.
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Correct Answer: D. Uracil
Explanation:
RNA uses uracil instead of thymine.
Uracil pairs with adenine.
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Correct Answer: A. RNA carrying coding information from DNA to ribosomes
Explanation:
MRNA contains codons specifying amino-acid sequence.
It is translated by ribosomes.
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Correct Answer: B. RNA carrying amino acids to the ribosome
Explanation:
TRNA has an anticodon and an amino-acid attachment site.
It matches amino acids to mRNA codons.
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Correct Answer: C. A pairs with T, and G pairs with C
Explanation:
Hydrogen bonding produces specific pairing.
This complementarity supports accurate replication.
