1. Nuclear mitosis takes place in
------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
a)Bacteria
b)plants
c)fungi
d)animals
2. In meiosis, all the following statements are true except
a) separation of homologous chromosome in meiosis I
b)prophase is comparatively longer and may take days
c)each bi valent has four chromatids and 2 centromeres
d)centromeres divides only during anaphase I
3. Crossing over takes place only in
a)meiosis only
b)mitosis only
c)both mitosis and meiosis
d)none of the above
4. The following statements are true except
a) chromosomes are single stranded in anaphase of mitosis
b) chromosomes are single stranded in anaphase I of meiosis
c) chromosomes are single stranded in anaphase II of meiosis
d)sister chromatids are separated during anaphase of mitosis
5.Centromeric division takes place during
a) metaphase of mitosis
b)anaphase I of meiosis
c)telophase of mitosis
d)anaphase II of meiosis
6. A cell at G1 of interphase has 8 chromososmes. The number of chromosomes at the anaphase of mitosis will be
a)4
b)8
c)12
d)16
7. A cell at G1 of interphase has 8 chromososmes. The number of chromatids at the metaphase of mitosis will be
a)4
b)8
c)12
d)16
8. A cell at G1 of interphase has 8 chromososmes. The number of chromatids at the metaphase I of meiosis will be
a)4
b)8
c)12
d)16
9. A cell at G1 of interphase has 8 chromososmes. The number of chromosomes at the metaphase II of meiosis will be
a)4
b)8
c)12
d)16
10. Exchange of segments between sister chromatids of non homologous chromosome is
a) crossing over
b)transition
c)transversion
d)translocation
11. Which one of the following is not a reason for aneuploidy
a) Robertsonian translocation
b) nondisjuction
c) loss of centromere
d)loss of telomere
12. The most variable phase in cell cycle
a) G1
b)S
c)G2
d)M
13. S phase is characterised by
a) DNA synthesis only
b)histone synthesis only
c) both DNA and histone synthesis
d)none of the above
14. Which of the following statement is true
a) The concentration of cyclins and CDKs varies throughout cell cycle
b)The concentration of CDKs and cyclins remains constant throughout cell cycle
c) The concentration of cyclins remains constant throughout cell cycle
d) The concentration of cyclins varies throughout cell cycle
15. Cyclins and CDKs in M phase
a) CDK4 + cyclin D
b) CDK 2+ cyclin E
c) CDK2+cyclinA
d) CDK 1 +cyclin B/A
16. Cyclin B is involved in the regulation of G2/M checkpoint. What would be the change in the amount of Cyclin B during mitosis
a)Concentration of cyclin B increases
b) Concentration of cyclin B decreases
c)Concentration of cyclin B remains same
d) concentration of cyclin B gradually decreases
17.Growth of cell occurs during which phase of cell cycle?
a) Interphase
b)metaphase
c)anaphase
d)telophase
18. The threadlike structures that radiates from each centromere by the end of prophase are
a) polar microtubules
b) aster microtububules
c) spindle microtubule
d) kinetochore microtubule
19. How many different types of gametes could be produced by an individual with the arbitrary genotype of FFggHHIiJj
a)2
b)4
c)6
d)8
20. Non-disjunction in meiosis II may result in the formation of
a) n+1, n-1 and n gametes
b) n+1, n-1 gametes
c)n+2, n-1 and n gametes
d)n+1 gametes only
21.Colchicine arrest cell division during which one of the phases of the cell cycle?
a)G1
b)S
c)Early prophase
d)Metaphase
Answers
1. c)fungi
2. d)centromeres divides only during anaphase I
3. c) both mitosis and meiosis
4. b) chromosomes are single stranded in anaphase I of meiosis
5. d)anaphase II of meiosis
6. c) 16
7. d) 16
8. d) 16
9. a)4
10. d)translocation
11. d)loss of telomere
12. a)G1
13. c) both DNA and histone synthesis
14. d) The concentration of cyclins varies throughout cell cycle
15. d) CDK 1 +cyclin B/A
16. d) concentration of cyclin B gradually decreases
17. a) interphase
18. d) kinetochore microtubule
19. b)4
20. a) n+1, n-1 and n gametes
21. d) Metaphase
------------------------------------------ Best Wishes: Dr.Ehab Aboueladab, Tel:01007834123 Email:ehab10f@gmail.com,ehababoueladab@yahoo.com ------------------------------------------
