Biology Biotechnology Principles and Processes All Topic Question For Revision Test Single Correct MCQ
Published on: August 11, 2026

The same basic techniques can be used to analyze the DNA from species as diverse as bacteria and humans because

A
all cells are identical.
B
every organism has the same amount of DNA.
C
the DNA sequences of all organisms are the same.
D
DNA has a consistent structure in all organisms.

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The correct answer is:
D

All organisms—from bacteria to humans—use the same basic DNA structure (double helix, nucleotide composition, and chemical nature). Because of this universal structure, the same techniques (like electrophoresis, PCR, restriction digestion) can be used across species.

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