객관식
Which of the following lists correctly identifies the four nitrogenous bases found in DNA?
107
views
7. DNA and Chromosome Structure
DNA Structure
객관식
Which molecules make up the backbone of DNA?
A
Deoxyribose sugars and phosphate groups
B
Ribose sugars and nitrogenous bases
C
Amino acids and deoxyribose sugars
D
Nitrogenous bases and phosphate groups
검증된 단계별 안내1
Recall the basic structure of DNA, which consists of a long chain of nucleotides.
Understand that each nucleotide is composed of three parts: a phosphate group, a sugar molecule, and a nitrogenous base.
Identify that the sugar in DNA is deoxyribose, which differs from ribose found in RNA by lacking one oxygen atom.
Recognize that the backbone of the DNA strand is formed by alternating sugar (deoxyribose) and phosphate groups linked by phosphodiester bonds.
Note that the nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugar and project inward, pairing with complementary bases on the opposite strand, but they do not form the backbone.
