Biology Biotechnology PMDC Conceptual Practice
PMDC Verified Question 16 of 65
A single strand of nucleic acid tagged with a radioactive molecule is called a:
A
Vector
B
Plasmid
C
Primer
D
Probe
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Official Correct Choice:
Option D: Probe
Concept:

Molecular probes for target nucleic acid sequence detection.

Solution:

A single-stranded DNA or RNA molecule tagged with a radioactive isotope (e.g., \( ^{32}\text{P} \)) or fluorescent tag used to locate complementary target sequences is termed a probe.

Why other options are incorrect:

  • Vector: A DNA vehicle (like a plasmid or viral genome) used to transfer foreign genetic material into a host cell.


  • Plasmid: Small, circular, extrachromosomal double-stranded DNA molecule found in bacteria.


  • Primer: Short single-stranded oligonucleotide used to initiate DNA replication by DNA polymerase.

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