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NEET Biology MCQ
Neet Biology Cell Cycle, Cell Division Mcq
Quiz 12
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Q.1
Which factors are required for growth ?
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a) An increase in group of cells, a duplication of genetic material
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b) An increase in group of cells, production of daughter cells by mitosis
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c) A dupliction of genetic material and a division assuring that daughter cells receive an equal complement of genetic material.
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d) An increase in cell mass, a duplication of genetic material, a division assuring that each daughter cell receives an equal complement of the genetic material
Explanation
Answer:(d)
Q.2
How many mitotic divisions must occur in a cell to form 1024 cells ?
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a) 10
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b) 20
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c) 40
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d) 64
Explanation
Answer:(a)
Q.3
A. The meiotic division-I is also called reduction division. R. During this the chromosomes are distributed in two cells in half their number.
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a) Both A and R are true and R is correct explanation of A.
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b) Both A and R are true and R is not correct explanation of A
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c) A is true and R is wrong
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d) A is wrong and R is true
Explanation
Answer:(a)
Q.4
Which of the following statement is/are correct for prophase of mitosis ? (i) At the end of this phase nuclear membrane and nucleolus disintegrate. (ii) At the end of this phase two chromosome and a centromere holding them together. (iii) This phase begins with the condensation of chromatids along their lengths.
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a) (i) only
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b) only (i) and (ii)
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c) (i) and (iii)
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d) only (ii) and (iii) (d)
Explanation
Answer:(a)
Q.5
Which is the true statement for mitosis ?
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a) Two cells are formed as a result of this division are identical in all aspects.
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b) Cells formed as a result of mitosis have different genetic characters.
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c) Cell formed by it performs diverse functions i.e. show division of labour
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d) The number of chromosomes in the new cells are half than that of the parent cell.
Explanation
Answer:(a)
Q.6
During prophase – I of meiosis homologous chromosomes pair with each other to form bivalent. A bivalent is an association of :
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a) Two chromatids and one centromere
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b) Four chromatids and four centromeres
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c) Two chromatids and two centromeres
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d) Four chromatids and two centromeres
Explanation
Answer:(c)
Q.7
During cell cycle DNA replication takes place in.......
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a) G1 - phase
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b) S - phase
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c) G2 - phase
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d) M - phase
Explanation
Answer:(b)
Q.8
Which of the correct order of phases in prophsae I ?
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a) Leptotene, zygotene, pachytene, diplotene, diakinesis
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b) Laptotene, pachytene, zygotene, diplotene, dikinesis
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c) Leptotene, diakinesis, pachytene, diplotene, zygotene
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d) Diakinesis, diplotene, pachytene, zygotene, leptotene
Explanation
Answer:(a)
Q.9
Pick out the correct statements : (A) Synapsis of homologous chromosomes takes place during prophase-I of meiosis. (B) Division of centromeres takes place during anaphase I of meiosis. (C) Spindle fibres disappear completely in telophase of mitosis. (D) Nucleoli reappear at telophase I of meiosis
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a) A only
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b) C only
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c) A and B only
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d) A, C, and D only
Explanation
Answer:(d)
Q.10
With how many cell reproduction starts ?
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a) Single cell
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b) Two cells
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c) Somatic cell
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d) Many cells
Explanation
Answer:(a)
Q.11
The separation of two chomatids of each chromosome during early anaphase is initiated by :
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a) The elongation of metaphytic spindle
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b) Attachment of spindle fibres with Kinetochore
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c) The interaction of centromere with the chromosomal fibres.
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d) All the above
Explanation
Answer:(b)
Q.12
In which of the following matters mitosis and meiosis are similar ?
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a) Both include separation of paired chromosomes.
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b) Both process occurs in all kinds of cells
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c) Both are precede by DNA replication
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d) Both have pairing of homologous chromosomes
Explanation
in mitosis, meiosis is preceded by a process of DNA replication that converts each chromosome into two sister chromatids. Answer:(d)
Q.13
Statement – P : Interphase is divided in three sub phases. Statement – Q : G1 phase is the initial phase of interphase.
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a) Statement P and Q both are correct
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b) Statement P is correct statement Q is wrong
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c) Statement P is wrong and statement Q is correct
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d) Statement P and Q both are wrong
Explanation
Answer:(a)
Q.14
Which of the following statement is/are correct for Meiosis-II ? (i) Chromosomes are arranged on equatorial plate in prophase-II (ii) Nucleolus disappear during telophase-II (iii) In anaphase-II, the chromatids with their independent centromeres are called chromosomes. (iv) In metaphase-II, centromere of each chromosome becomes attached to filament of bipolar spindle.
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a) only (i) and (ii)
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b) only (iii) and (iv)
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c) only (i), (ii) and (iii)
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d) (i), (ii) and (iii)
Explanation
Answer:(b)
Q.15
What does “G1” indicate in given figure of cell cycle ?
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a) Segregation of chromosomes
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b) Nucleus with chromosomes in cell
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c) Duplication of chromosomes
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d) A cell with duplicated chromosomes
Explanation
Answer:(b)
Q.16
Spindle fibres are composed of :
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a) Cellulose
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b) Lipids
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c) Proteins
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d) Pectins
Explanation
Answer:(c)
Q.17
The locations at which crossing over occurs are known as......
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a) Chiasmata
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b) Centriole
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c) Kinetochore
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d) Centromere
Explanation
Answer:(a)
Q.18
During meiosis crossing over occurs between which part of homologous chromosome ?
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a) genes
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b) alleles
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c) nonsister chromatids
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d) sister chromatids
Explanation
Answer:(c)
Q.19
Select the correct option with respect to mitosis.
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a) Chromatids start moving towards opposite poles in telophase.
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b) Chromatids separate but remain in the centre of the cell in anaphase.
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c) Golgi complex and endoplasmic reticulum are still visible at the end of prophase.
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d) Chromosomes move to the spindle equator and get aligned along equatorial plate inmetaphase.
Explanation
Answer:(d)
Q.20
At the end of which stage does cell enter mitosis ?
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a) G1 - phase
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b) G2 - phase
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c) M - phase
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d) S - phase
Explanation
Answer:(b)
Q.21
The term ‘karyokinesis’ is used for….
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a) Changes occuring at anaphase, when chromosomes move to the opposite poles.
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b) Event occuring during interphase
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c) Disappearance of nuclear mimbrane during metaphase
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d) Over all changes occurring in nucleus during the cell division.
Explanation
Answer:(c)
Q.22
The role of mitosis is not merely to divide a cell into two daugher cells but to ensure genetic continuity from one cell generation. The mechanism ensuring genetic continutity is;
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a) Formation of cell by new chromosome
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b) Formation of two daughter cells
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c) Formation of two cells with identical DNA
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d) The new cells have half the number of chromosomes.
Explanation
Answer:(c)
Q.23
During which stage of meiosis crossing over takes place ?
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a) Dikinesis
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b) Zygotene
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c) Leptotene
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d) Pachytene
Explanation
Answer:(d)
Q.24
Significance of meiosis.........
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a) A very significant contributing of mitosis is cell repair
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b) The number of chromosomes is maintained in all cells.
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c) Due to division, cell can maintain their efficient size.
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d) It is important process for evolution
Explanation
Answer:(d)
Q.25
A. Number of chiasmata is more in longer chromosomes. R. The number of chiasmata depends on the length of chromosomes.
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a) Both A and R are true and R is correct explanation of A.
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b) Both A and R are true and R is not correct explanation of A
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c) A is true and R is wrong
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d) A is wrong and R is true
Explanation
Answer:(a)
Q.26
Match the following :
Coulmn-I
Coulmn-II
(A) Cytokinesis
(i) Reformation of nuclear Membrane and golgi body
(B) Metaphase
(ii) Synthesis of RNA and protein
(C) Telophase
(iii) Centromers of chmosomes are arranged on equatorial plate.
(D) Interphase
(iv) Contraction of chomosomes starts
- - - -
(v) The formation of synctium
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a) (A - i) (B - ii) (C - iii) (D - iv)
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b) (A - iv) (B - iii) (C - i) (D - ii)
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c) (A - iv) (B - ii) (C - i) (D - iv)
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d) (A - iv) (B - iii) (C - ii) (D - i)
Explanation
Cytokinesis: Cytokinesis is the part of the cell division process during which the cytoplasm of a single eukaryotic cell divides into two daughter cells. Contraction of chomosomes starts. A - iv Metaphase: Chromosomes line up at the metaphase plate (equatorial plate), under tension from the mitotic spindle. The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide.B - iii Telophase: As chromosomes reach the cell poles, a nuclear envelope is re-assembled around each set of chromatids, the nucleoli reappear, and chromosomes begin to decondense back into the expanded chromatin that is present during interphase. The mitotic spindle is disassembled and remaining spindle microtubules are depolymerized. C - i Interphase: G1 (Gap 1), in which the cell grows and functions normally. During this time, a high amount of protein synthesis occurs. D - ii Answer:(b)
Q.27
What is synthesized during G2 – phase ?
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a) Protein
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b) Micro tubules
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c) RNA
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d) (a) and (b)
Explanation
Answer:(d)
Q.28
In mitosis the daughter cells resemble to their parent cell. But in meiosis they differ not only from parent cell in having half the number of chromosomes, but also differ among themselves qualitatively in genetic constitution due to.....
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a) Crossing over, independent assortment and segregation
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b) Segragation and crossing over only
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c) Independent assortment and crossing over only
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d) Independent assortment and segregation only
Explanation
Answer:(a)
Q.29
A. During interphase, chromosomes are recognized as chromatin network. R. Chromosomes are highly dispersed during this phase.
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a) Both A and R are true and R is correct explanation of A.
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b) Both A and R are true and R is not correct explanation of A
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c) A is true and R is wrong
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d) A is wrong and R is true
Explanation
Answer:(c)
Q.30
Find the incorrect pair.
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a) Metaphase - Kinetochore
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b) Prophase – Chromosome made up of two chromatids and centromere
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c) Bipolar spindle – Cytoplasmic fibres of protein
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d) Anaphase – Equatorial plate
Explanation
Answer:(d)
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