Multiple Choice
The four nitrogenous bases commonly found if DNA are:
a) Adenine, thymine, cytosine, uracil
b) Uracil, adenine, cytosine, guanine.
c) Uracil, cytosine, guanine, thymine.
d) Adenine, thymine, cytosine, guanine.
e) None are correct.
2. Cell Chemistry & Cell Components
Nucleic Acids
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Which of the following lists represents the chemical components of a nucleotide?
A
A nitrogenous base, an amino acid, and a pentose sugar
B
A nitrogenous base, an amino acid, and a phosphate group
C
A nitrogenous base, a fatty acid, and an amino acid
D
A series of nitrogenous bases, a nucleic acid backbone, and a hexose sugar
E
A nitrogenous base, a phosphate group, and a pentose sugar
Verified step by step guidance1
Understand the structure of a nucleotide: A nucleotide is the basic building block of nucleic acids, such as DNA and RNA. It consists of three components: a nitrogenous base, a pentose sugar, and a phosphate group.
Identify the nitrogenous base: This is one of the key components of a nucleotide. The nitrogenous bases can be adenine (A), thymine (T), cytosine (C), guanine (G), or uracil (U) in RNA.
Recognize the pentose sugar: In nucleotides, the sugar is a five-carbon sugar, which is why it is called a pentose. In DNA, this sugar is deoxyribose, and in RNA, it is ribose.
Identify the phosphate group: This component is crucial for forming the backbone of the nucleic acid structure. It links the sugars of two adjacent nucleotides, creating a chain.
Evaluate the options: Compare each option to the known components of a nucleotide. The correct option should include a nitrogenous base, a pentose sugar, and a phosphate group, which matches the description of a nucleotide.
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