1. OBJECTIVE QUESTIONS
FOR
NEET AIIMS JIPMER

2. BIOLOGY
CELL DIVISION
SET 2
MCQ’s

3. Q1. Bacterial cells divide by
Budding
Binary fission
Mitosis
Meiosis

4. ANSWER (B) EXPLANATION
In bacteria, which are prokaryotes and lack a nucleus, cell division consists of a simple procedure called binary fission (literally, “splitting in half”), in which the cell divides into two equal or nearly equal halves).

5. Q2. Who discovered Mitosis
Walther Fleming
Lewis Carroll
Miller
Watson and Crick

6. ANSWER (A) EXPLANATION
Chromosomes were first observed by the German embryologist Walther Fleming in Further he also discovered mitosis

7. Q3. Human cells contain, 44 chromosomes 46 chromosomes 48 chromosomes

8. ANSWER (B) EXPLANATION
Human cells have 46 chromosomes in its nucleus

9. Q4. Individuals with an extra copy of the very small chromosome number 21
Down syndrome
Turner syndrome
Parkinson’s diseases
Anemia

10. ANSWER (A) EXPLANATION
Individuals with an extra copy of the very small chromosome number 21, develops Down syndrome. Such individuals grow develop more slowly than normal and are mentally retarded

11. Q5. Chromosomes are composed of chromatin, a complex of DNA and protein. Chromatin is made up of
About 50% DNA and 650% protein.
About 40% dna and 60% protein.
About 60% dna and 40% protein.
About 80% dna and 20% protein.

12. ANSWER (B) EXPLANATION
Chromosomes are composed of chromatin, a complex of DNA and protein. Chromatin is made up of about 40% DNA and 60% protein

13. Q6. A typical human chromosome contains how many nucleotides

14. ANSWER (B) EXPLANATION
A typical human chromosome contains about 140 million nucleotides (1.4 × 108) nucleotides

15. Q7. DNA duplex is coiled around a core of how many histone molecules, to form nucleosome4 5 8 10

16. ANSWER (A)
EXPLANATION
DNA duplex is coiled around a core of eight histone proteins, forming a complex known as a nucleosome

17. Q8. Which amino acids imparts positive charge to histone protein
Lysine and
Arginine and lysine
Arginine and histidine
Proline and lysine

18. ANSWER (B) EXPLANATION
Unlike most proteins, which have an overall negative charge, histones are positively charged, due to an abundance of the basic amino acids arginine and lysine. Means these are positively charged amino acids

19. Q9. Highly condensed portions of the chromatin are called
Heterochromatin
Euchromatin
Homochromation
Genes

20. ANSWER (A) EXPLANATION
Highly condensed portions of the chromatin are called heterochromatin

21. Q10. Euchromatin means, DNA portion which is never expresses
DNA with open configuration, and its genes can be expressed
Origin of replication
DNA content of each cell

22. ANSWER (B) EXPLANATION
Euchromatin means DNA with open configuration, and its genes can be expressed. Because of its loose/ open configuration, DNA replicating enzymes can have easy access to such open region of DNA

23. Q11. Euchromatin, is condensed only during cell division.
True
False
Occurs during resting phase as well
Never condensed during cell division

24. ANSWER (A) EXPLANATION
Euchromatin, is condensed only during cell division; because, compact packaging facilitates the movement of the chromosomes during cell division

25. Q12. Choose the correct statement(s).
In humans, all chromosomes are similar in size
In humans, all chromosomes are dissimilar in size
In humans, all chromosomes contains 2 centromeres
In humans, the length of all chromosomal arms are same

26. ANSWER (B) EXPLANATION
In all species including humans, Chromosomes may differ widely in appearance. They vary in size, staining properties, the location of the centromere

27. Q13. Homologous chromosomes means
Two copies of one of the chromosomes in body cells
Two copies of chromatin material
Similar structured chromosomes
Two copies of each chromosome in body cells

28. ANSWER (D) EXPLANATION
The two copies of each chromosome in body cells are called homologous chromosomes, or homologues; which are similar to each other in their size and number of genes

29. Q14. Before cell division, each homologue replicates, producing two identical
Daughter chromatids
Sister chromatids
Chromosomes
Both a and b

30. ANSWER (B) EXPLANATION
Before cell division, each homologue replicates, producing two identical sister chromatids joined at the centromere

31. Q15. The Human cell contains 46 centromeres and
92 chromatids
46 chromatids
23 chromatids
22 chromatids

32. ANSWER (A) EXPLANATION
Human body cell contains a total of 46 replicated chromosomes, each composed of two sister chromatids joined by one centromere. The cell thus contains 46 centromeres and 92 chromatids (2 sister chromatids for each of 2 homologues for each of 23 chromosomes

33. Q16. Chose the correct sequence of cell division phases
G G2 S M
G1 S G2 M
S G1 G2 M
S M G1 G2

34. ANSWER (B) EXPLANATION
G1 S G2 M is correct sequence of cell division phases

35. Q17. Interphase consists of which phases of cell division
G1 and S phases
G1, S, G2 phases
S phase
G1, G2phases

36. ANSWER (B) EXPLANATION
Interphase consist of G1, S, G2 phases

37. Q18. Chose the correct sequence of mitosis stages
Prophase Anaphase Metaphase Telophase
Metaphase Prophase Anaphase Telophase
Prophase Metaphase Anaphase Telophase
Anaphase Prophase Metaphase Telophase

38. ANSWER (C) EXPLANATION
Prophase Metaphase Anaphase Telophase

39. Q19. In which phase Microtubular apparatus assembles and binds to the chromosomes ,
G1 phase
S phase
Cytokinesis
M phase

40. ANSWER (D) EXPLANATION
M or mitosis is the phase of the cell cycle in which the microtubular apparatus assembles, binds to the chromosomes, and moves the sister chromatids apart

41. Q20. Cells often enter a resting state called G0 phase
Before DNA replication
After DNA replication
After S phase
After G2 phase

42. ANSWER (A) EXPLANATION
Cells often pause in G1 before DNA replication and enter a resting state called G0 phase; they may remain in this phase for days to years before resuming cell division).
In cells with a nucleus, as in eukaryotes, the cell cycle is also divided into three periods: interphase, the mitotic (M) phase, and cytokinesis. During interphase, the cell grows, accumulating nutrients needed for mitosis, preparing it for cell division and duplicating its DNA.

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