Scelta multipla
In a karyotype, which of the following can be directly observed?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
Scelta multipla
Which of the following best describes the structure of DNA in terms of the number of strands it contains?
A
DNA has four strands.
B
DNA is typically single-stranded.
C
DNA is typically double-stranded.
D
DNA is triple-stranded.
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Recall the basic structure of DNA, which is composed of nucleotides forming long chains called strands.
Understand that DNA typically consists of two complementary strands that run in opposite directions, forming a double helix.
Recognize that the two strands are held together by hydrogen bonds between complementary base pairs (adenine with thymine, and cytosine with guanine).
Note that DNA is not usually single-stranded, triple-stranded, or four-stranded under normal biological conditions.
Conclude that the best description of DNA's structure in terms of strand number is that it is typically double-stranded.
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