DNA Nucleotide Structure Quiz Questions
Quiz Description
- 1.
How many DNA molecules are in a human cell?
- A.
46
- B.
23
- C.
2
- D.
52
Correct Answer
A. 46Explanation
In a human cell, there are 46 DNA molecules. This is because humans have 23 pairs of chromosomes, and each chromosome contains a DNA molecule. Therefore, when you add up the DNA molecules from each pair of chromosomes, you get a total of 46 DNA molecules in a human cell.Rate this question:
-
- 2.
The backbone of a DNA molecule is made up of:
- A.
Sugars and phosphates
- B.
Base-pairs
- C.
Adenosine triphosphate
- D.
Enzymes
Correct Answer
A. Sugars and pHospHatesExplanation
The backbone of a DNA molecule is made up of sugars and phosphates. These sugars are called deoxyribose, and they are connected together by phosphate groups. The sugar-phosphate backbone forms a strong, stable structure that runs along the outside of the DNA molecule. The base pairs, on the other hand, are located in the interior of the DNA molecule and are responsible for carrying the genetic information. Adenosine triphosphate (ATP) and enzymes are not part of the backbone structure of DNA.Rate this question:
-
- 3.
In a DNA molecule, none of the following base-pairs are possible, EXCEPT:
- A.
Cytosine - Adenine
- B.
Guanine - Cytosine
- C.
Thymine - Uracil
- D.
Adenine - Guanine
Correct Answer
B. Guanine - CytosineExplanation
The base pairs in a DNA molecule are Adenine (A) with Thymine (T) and Guanine (G) with Cytosine (C). Therefore, the only base pair that is not possible is Thymine (T) with Uracil (U), as Uracil is found in RNA molecules instead of Thymine.Rate this question:
-
- 4.
Where is DNA found?
- A.
In the nucleus
- B.
In the cytoplasm
- C.
In endoplasmic reticulum
- D.
In the Golgi Apparatus
Correct Answer
A. In the nucleusExplanation
DNA is found in the nucleus of a cell. The nucleus is the control center of the cell and contains the genetic material, including DNA. DNA is responsible for carrying the genetic instructions that determine the characteristics and functions of living organisms. It is located within the nucleus to protect it from potential damage and to ensure that it is readily available for replication and transcription processes. DNA is not found in the cytoplasm, endoplasmic reticulum, or Golgi Apparatus, as these organelles have different functions within the cell.Rate this question:
-
- 5.
All of the following are part of a DNA nucleotide, EXCEPT:
- A.
A ribose sugar
- B.
A deoxyribose sugar
- C.
A nitrogenous base
- D.
A phosphate group
Correct Answer
A. A ribose sugarExplanation
A DNA nucleotide consists of three components: a nitrogenous base, a phosphate group, and a sugar. In DNA, the sugar is deoxyribose, not ribose. Therefore, the correct answer is a ribose sugar, which is not a part of a DNA nucleotide.Rate this question:
-
- 6.
The building blocks of nucleic acids are called:
- A.
Nucleotides
- B.
Nucleosomes
- C.
Nucleozymes
- D.
Nucleoforms
Correct Answer
A. NucleotidesExplanation
Nucleic acids are composed of smaller units called nucleotides. These nucleotides consist of a sugar molecule, a phosphate group, and a nitrogenous base. They are the fundamental building blocks of DNA and RNA, which play crucial roles in storing and transmitting genetic information in living organisms. Nucleosomes, nucleozymes, and nucleoforms are not the correct terms for the building blocks of nucleic acids.Rate this question:
-
- 7.
Alleles are different forms of a gene. Which of the following explains how alleles differ?
- A.
The sequence of bases is slightly different.
- B.
The number of bases is slightly different.
- C.
The base pairs bond slightly differently.
- D.
The bases are attached to phosphates, not sugars.
Correct Answer
A. The sequence of bases is slightly different.Explanation
Alleles are different forms of a gene, and they differ from each other in terms of the sequence of bases. This means that the order of the nucleotide bases (adenine, thymine, cytosine, and guanine) within the allele's DNA is slightly different. This variation in the sequence of bases is what distinguishes one allele from another and can result in different traits or characteristics being expressed.Rate this question:
-
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jul 01, 2024Quiz Edited by
ProProfs Editorial Team -
Mar 14, 2014Quiz Created by
Will Dorsey
Back to top