Multiple Choice
Which nitrogenous base is not found in DNA?
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7. DNA and Chromosome Structure
DNA Structure
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Which of the following best describes the physical structure of a gene?
A
A specific sequence of nucleotides within a DNA molecule
B
A chain of amino acids linked by peptide bonds
C
A double helix formed by two complementary RNA strands
D
A cluster of ribosomes translating mRNA
Verified step by step guidance1
Understand that a gene is a fundamental unit of heredity in living organisms, encoded in DNA.
Recall that DNA is composed of sequences of nucleotides, which are the building blocks of genetic information.
Recognize that a gene specifically refers to a particular sequence of these nucleotides that codes for a functional product, usually a protein.
Differentiate this from other biological structures: a chain of amino acids is a protein, not a gene; a double helix is the shape of DNA, not RNA; and ribosomes are cellular machines, not genes.
Conclude that the best description of a gene's physical structure is 'a specific sequence of nucleotides within a DNA molecule.'
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