Multiple Choice
RNA and DNA are classified as which type of organic compound?
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7. DNA and Chromosome Structure
DNA Structure
Multiple Choice
Which of the following statements about DNA structure is true?
A
DNA contains uracil as one of its standard nitrogenous bases.
B
DNA is typically a double-stranded helix with antiparallel strands held together by hydrogen bonds between complementary bases.
C
DNA is a single-stranded polymer in most cells, with bases paired by covalent bonds.
D
In DNA, adenine pairs with cytosine and guanine pairs with thymine.
Verified step by step guidance1
Review the basic structure of DNA, which is a nucleic acid composed of nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base.
Recall the four standard nitrogenous bases in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). Note that uracil (U) is found in RNA, not DNA.
Understand that DNA strands are arranged in a double helix, where two strands run in opposite directions (antiparallel) and are held together by hydrogen bonds between complementary bases.
Remember the base pairing rules: adenine pairs with thymine via two hydrogen bonds, and guanine pairs with cytosine via three hydrogen bonds.
Evaluate each statement based on these facts to determine which one correctly describes DNA structure.
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