객관식
What type of chemical bond is responsible for holding together the paired bases in the DNA double helix?
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7. DNA and Chromosome Structure
DNA Structure
객관식
How many strands make up the structure of a typical DNA molecule?
A
Four
B
Two
C
One
D
Three
검증된 단계별 안내1
Recall the basic structure of DNA, which is known as a double helix.
Understand that the double helix consists of two long strands twisted around each other.
Each strand is made up of a sugar-phosphate backbone and nitrogenous bases.
The two strands are complementary and held together by hydrogen bonds between paired bases.
Therefore, the typical DNA molecule is composed of two strands.
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