Multiple Choice
Which term describes a DNA molecule that can carry a DNA sequence of interest and is commonly used in genetic engineering?
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7. DNA and Chromosome Structure
DNA Structure
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following is a characteristic of DNA?
A
It contains the sugar ribose.
B
Its nitrogenous bases include adenine, thymine, cytosine, and guanine.
C
It is composed of a double helix structure.
D
It is typically single-stranded in cells.
Verified step by step guidance1
Recall the basic structure of DNA and its components: DNA is a nucleic acid made up of nucleotides, each containing a sugar, a phosphate group, and a nitrogenous base.
Identify the sugar in DNA: DNA contains deoxyribose, not ribose. Ribose is found in RNA.
List the nitrogenous bases in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). Note that thymine is unique to DNA, while RNA has uracil instead.
Understand the structural form of DNA: DNA typically exists as a double helix, which is two strands twisted around each other, held together by base pairing.
Recognize that DNA is usually double-stranded in cells, whereas RNA is typically single-stranded.
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