MCQ on DNA with Answers:
1. Who discovered DNA?
(1) Friedrich Miescher
(2) James Watson
(3) Francis Crick
(4) Altman
Answer: 1
2. The basic unit of DNA molecule is_______
(1) Deoxyribonucleotides
(2) ribonucleotides
(3) Nitrogenous bases
(4) Gene
Answer: 1
3. The double helix structure of DNA was discovered by_____
(1) Friedrich Miescher
(2) James Watson
(3) Francis Crick
(4) Both (2) and (3)
Answer: 4
4. Which is the monomer of DNA?
(1) Deoxyribonucleotides
(2) ribonucleotides
(3) Nitrogenous bases
(4) Gene
Answer: 1
5. What is the full form of DNA?
(1) Degenerative acid
(2) Deoxyribonucleic acid
(3) Deadly nucleic acid
(4) Disoriented acid
Answer: 2
6. What is the most common form of DNA?
(1) B-form
(2) Z-form
(3) B-form
(4) None of these
Answer: 1
7. Compared to RNA, the unique components of DNA are________
(1) Ribose and uracil
(2) Deoxyribose and thymine
(3) Deoxyribose and uracil
(4) Deoxyribose and Guanine
Answer: 2
8. The structure that contains DNA in plant cells is________
(1) cell membrane and cell wall
(2) vacuoles and ribosomes
(3) Mitochondria and Cell wall
(4) Chromosomes and Chloroplasts
Answer: D
9. The following substances that can polymerize to form DNA molecules are________
(1) Deoxyribose
(2) deoxynucleotides
(3) amino acid
(4) nitrogenous base
Answer: 2
10. What is the backbone of DNA?
(1) Phosphate Backbone
(2) Sugar Backbone
(3) Adenine Backbone
(4) Both (2) and (3)
Answer: 1
11. DNA in human epithelial cells is present in________
(1) Nucleus, chloroplasts, mitochondria
(2) nucleus, mitochondria
(3) nucleus
(4) nucleus, ribosome, mitochondria
Answer: 2
12. What is the shape of DNA?
(1) The double helix
(2) Triple helix
(3) Both
(4) None of these
Answer: 1
13. If the DNA strand has nitrogenous base sequence ATTGCC, the mRNA will have?
(1) ATTGCA
(2) UGGACC
(3) UAACGG
(4) ATCGCC
Answer: 3
14. A group of the following structures all containing DNA is_________
(1) Chloroplast, Golgi, centrosome, chromosome
(2) Chloroplasts, mitochondria, nucleus, bacterial plasmids
(3) Endoplasmic reticulum, ribosome, nucleus, centrosome
(4) Mitochondria, Ribosomes, Chromosomes, Golgi Apparatus
Answer: 2
15. Which of the following is a component of DNA_______
(1) Deoxyribose, nucleic acid and phosphate
(2) Deoxyribose, base and phosphate
(3) Ribose, base and phosphate
(4) Nucleosides, bases and phosphates
Answer: 2
16. Which of the following statements about the basic functions of DNA is incorrect
(1) Genetic information is stored in DNA
(2) DNA transfers genetic information through replication
(3) DNA is the embodiment of biological traits
(4) DNA expresses genetic information through transcription and translation
Answer: 3
17. Which of the following statements about DNA is false
(1) DNA in the nucleus of various somatic cells of the same organism has the same base composition
(2) The base content of a double-stranded DNA molecule is A+G=C+T or A+C=G+T
(3) The base content of a double-stranded DNA molecule is A/T=G/C
(4) DNA is only found in the nucleus
Answer: 4
18. The distribution of Chlamydomonas DNA in cells was as follows: 84% on chromosomes, 14% on chloroplasts, 1% on mitochondria, and 1% free in cytoplasm. These data show_________
(1) The genetic material of Chlamydomonas is mainly RNA
(2) The main carrier of Chlamydomonas DNA is the chromosome
(3) Chlamydomonas has no DNA in the cytoplasm
(4) Chlamydomonas chromosomes are composed of DNA, proteins and a small amount of RNA
Answer: 2
19. The distribution of nucleic acids in cells Which of the following is the most appropriate
(1) All DNA is located in the nucleus and all RNA is located in the cytoplasm
(2) Both DNA and RNA are distributed in the nucleus
(3) DNA is mainly distributed in the cell membrane and RNA is distributed in the cytoplasm
(4) DNA is mainly distributed in the nucleus, RNA is mainly distributed in the cytoplasm
Answer: 4
20. Which of the following statements corresponds to the correct relationship?(1) Substance: starch Monomer: sucrose Basic elements: C, H, O
(2) Substance: Protein Monomer: Amino Acids Basic Elements: C, H, O, N, P
(3) Substance: DNA Monomer: Deoxynucleotides Basic elements: C, H, O, N, P
(4) Substance: RNA Monomer: Deoxynucleotides Basic Elements: C, H, O, N
Answer: 3