Scelta multipla
Which of the following is a characteristic of DNA?
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7. DNA and Chromosome Structure
DNA Structure
Scelta multipla
Which of the following statements about human DNA is correct?
A
Human DNA is typically double-stranded and forms a right-handed helix known as B-DNA.
B
Human DNA contains uracil as one of its four nitrogenous bases.
C
Human DNA is composed of a single linear molecule in each cell.
D
The sugar in human DNA is ribose.
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Review the structure of human DNA, noting that it is composed of two strands forming a double helix.
Recall that the common form of DNA in human cells is B-DNA, which is a right-handed helix.
Identify the nitrogenous bases in human DNA: adenine (A), thymine (T), cytosine (C), and guanine (G); note that uracil (U) is found in RNA, not DNA.
Understand that human DNA is organized into multiple linear chromosomes, not a single linear molecule per cell.
Recognize that the sugar in DNA is deoxyribose, whereas ribose is found in RNA.
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