Scelta multipla
Restriction enzymes create breaks in which part of a DNA molecule?
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7. DNA and Chromosome Structure
DNA as the Genetic Material
Scelta multipla
Which nitrogenous base is not found in DNA?
A
Cytosine
B
Adenine
C
Guanine
D
Uracil
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Recall the four nitrogenous bases found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G).
Understand that DNA uses thymine (T) as one of its bases, while RNA uses uracil (U) instead of thymine.
Recognize that uracil is a nitrogenous base found only in RNA and not in DNA.
Compare the given options to the known DNA bases and identify which one is not part of DNA.
Conclude that uracil is the nitrogenous base not found in DNA.
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