Biology Biotechnology PMDC Conceptual Practice
PMDC Verified Question 11 of 65
Taq polymerase used in PCR is extracted from:
A
Escherichia coli
B
Thermus aquaticus
C
Agrobacterium tumefaciens
D
Bacillus thuringiensis
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Thermus aquaticus
Concept:

Thermostable DNA polymerases in molecular biology amplification.

Solution:

Taq polymerase is isolated from the thermophilic eubacterium Thermus aquaticus, which thrives in high-temperature hot springs and hydrothermal vents.

Why other options are incorrect:

  • Escherichia coli: Standard mesophilic laboratory host; its DNA polymerase denatures rapidly above \( 60^\circ \text{C} \).


  • Agrobacterium tumefaciens: Plant pathogen used as a biological vector for plant genetic transformation.


  • Bacillus thuringiensis: Soil bacterium that produces endotoxin proteins used for insect-resistant crops.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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