What are the three components of a nucleotide?
2.1.3 Nucleotides and nucleic acids (a-c) SYI

Quiz
•
Biology
•
12th Grade
•
Medium
Steven Yiu
Used 6+ times
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32 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Pentose Sugar, Nitrogenous base, Phosphate Group
Deoxyribose, Uracil, Guanine
Ribose Sugar, Adenine, Cytosine
Thymine, Purines, Phosphodiester Bond
Answer explanation
A nucleotide consists of three components: a pentose sugar, a nitrogenous base, and a phosphate group. The correct choice is 'Pentose Sugar, Nitrogenous base, Phosphate Group'. This choice includes all three components required for a nucleotide.
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which component of a nucleotide can be either ribose or deoxyribose?
Nitrogenous base
Phosphate group
Purines
Pentose sugar
Answer explanation
The pentose sugar is a component of a nucleotide that can be either ribose or deoxyribose. It is responsible for providing the backbone structure to the nucleotide. The other options, such as the nitrogenous base, phosphate group, and purines, are also important components of a nucleotide, but they do not determine the type of sugar present. Therefore, the correct choice is the pentose sugar.
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Where are nitrogenous bases attached in a nucleotide?
Second carbon of sugar
Third carbon of sugar
First carbon of sugar
Fourth carbon of sugar
Answer explanation
In a nucleotide, nitrogenous bases are attached to the first carbon of the sugar. This attachment is important for the structure and function of nucleic acids. The first carbon provides a stable connection for the nitrogenous base, allowing for the formation of the nucleotide sequence. The other options, such as the second, third, and fourth carbon of the sugar, are not involved in the attachment of nitrogenous bases. Therefore, the correct choice is the first carbon of the sugar.
4.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
How many types of nitrogenous bases are there in nucleotides?
1
2
3
4
Answer explanation
There are four types of nitrogenous bases in nucleotides: adenine, cytosine, guanine, and thymine. However, only two of these bases are present in DNA, which are adenine and thymine. Therefore, the correct answer is 2.
5.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which of the following is a purine nitrogenous base?
Cytosine
Thymine
Adenine
Uracil
Answer explanation
Adenine is a purine nitrogenous base. It is one of the four bases found in DNA and RNA. Adenine pairs with thymine in DNA and with uracil in RNA. Cytosine and thymine are pyrimidine bases, not purine bases. Uracil is also a pyrimidine base. Therefore, the correct answer is Adenine.
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
Which nitrogenous base pairs with thymine (or uracil) with two hydrogen bonds?
Cytosine
Guanine
Adenine
Purines
Answer explanation
Adenine is the nitrogenous base that pairs with thymine (or uracil) with two hydrogen bonds. This is because adenine forms two hydrogen bonds with thymine (or uracil) in DNA or RNA. Cytosine pairs with guanine with three hydrogen bonds, while guanine pairs with cytosine with three hydrogen bonds. Purines are a type of nitrogenous base that includes adenine and guanine. Therefore, the correct choice is Adenine.
7.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
How many hydrogen bonds are formed between cytosine and guanine?
1
2
3
4
Answer explanation
Three hydrogen bonds are formed between cytosine and guanine. These hydrogen bonds occur between the nitrogenous bases of the two nucleotides. The hydrogen bonds play a crucial role in stabilizing DNA. The correct choice is 3.
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