Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Nucleus

1. Nuclei were first discovered by
a) Strasburger
b) Fonatana
c) Robert Brown
d) Robert Koch
2. Which of the is the central commanding centre of the cell



Nucleus
a) nucleus
b) mitchondria
c) ER
d) ribosomes

3. The Grafting experiment of Hammerling established the role of nucleus in heredity. The experimental material was
a) Chlorella
b) Acetabularia
c) Chara
d) Scendesmus


4. Nucleus are absent in
a) Red blood cells and bacterium
b) Red blood cells, sieve cells and bacterium
c) Red blood cells only
d) none of these

5. Which of the following statements is true regarding the size of nucleus?
a) The size of the nucleus is directly proportional to that of the cytoplasm
b) The size of the nucleus depends on the total cell volume
c) The size of the nucleus depends on the chromosome number or ploidy level of the cell
d) all of these

6. Nucleus has
a) DNA only
b) DNA and protein only
c) DNA, RNA and proteins
d) none of these

7. Nuclear membrane is in continuous connection with
a) SER
b) RER
c) Golgi apparatus
d) lysosomes

8. The protein network that lines the inner side of nuclear membrane is called
a) Nucleolus
b) nuclear matrix
c) nuclear lamina
d) nuclear proteins

9. The number of nuclear pores depends on the
a) size of the cell
b) transcriptional activity of the cell
c) DNA content of the cell
d) all of these

10. The most important function of nuclear envelope is to
a) regulate nucleo cytoplasmic traffic
b) protect genetic material
c) prevent the entrance of active ribosomes into the nucleus
d) synthesis rRNAs

11. The DNA protein ratio in chromatin is
a) 3:1
b) 2:1
c) 1:1
d) 4:1

12. Nucleolus is a prominent acidophilic spherical bodies in the nucleus. The function is
a) RNA synthesis
b) DNA synthesis
c) histone synthesis
d) ribosomal subunit synthesis


13. The basic proteins of the nucleus are
a) nucleohistones
b) nucleoprotamines
c) both a and b
d) none of these

14. The major amino acids in histones are
a) Gluatamate and aspartic acid
b) lysine and arginine
c) arginine, lysine and histidine
d) histidine

15. The light stained and diffused region of chromatin is known as
a) Heterochromatin
b) Euchromatin
c) chromatin
d) none of these

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Answers
1. c) Robert Brown
2. a) nucleus
3. b) Acetabularia
4. b) Red blood cells, sieve cells and bacterium
5. d) all of these
6. c) DNA, RNA and proteins
7. b) RER
8. c) nuclear lamina
9. b) transcriptional activity of the cell
10. c) prevent the entrance of active ribosomes into the nucleus
11. c) 1:1
12. d) ribosomal subunit synthesis
13. c) both a and b
14. c) arginine, lysine and histidine
15. b) Euchromatin

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