0

Cell Cycle and Cell Division

Description: MCQs on Cell Cycle and Cell Division for Medical Entrance, Pharma, Class XI / XII Exams
Number of Questions: 26
Created by:
Tags: Cell Cycle Cell Division Medical Entrance Pharma Class XI / XII Cell Cycle and Division
Attempted 0/26 Correct 0 Score 0

The cell carries on mitosis without a break on entering

  1. S phase

  2. G2 phase

  3. M phase

  4. Interphase


Correct Option: C
Explanation:

Mitosis phase is the most important phase of the cell cycle.

What is the number of sporocytes required to produce 100 seeds?

  1. 200

  2. 100

  3. 125

  4. 25


Correct Option: C
Explanation:

n = n+ n /4

n= no. of seeds

The phase of cell division at which morphology of chromosomes can be best studied is

  1. telophase

  2. anaphase

  3. metaphase

  4. prophase


Correct Option: C
Explanation:

Chromosomes are most condensed and visible at this stage.

The number of mother cells required to produce 100 pollen grains is

  1. 100

  2. 99

  3. 50

  4. 25


Correct Option: D
Explanation:

During cell division in animal cells the spindle fibers are formed by

  1. cytoplasm

  2. centrioles

  3. nucleolus

  4. plasma membrane


Correct Option: B

In which of the following cells does meiosis take place?

  1. Collenchyma cells

  2. Tapetal cells

  3. Microspore mother cells

  4. Middle layer cells


Correct Option: C
Explanation:

Microspore mother cells are diploid (2N) and undergo meiosis to produce haploid pollens.

During mitosis in plant cells, spindle fibers originate from

  1. centrioles

  2. cytoplasm

  3. centromere

  4. nucleus


Correct Option: B

Which of the following conditions occurs when karyokinesis is not followed by cytokinesis?

  1. Monoploidy

  2. Haploidy

  3. Polyploidy

  4. Polyteny


Correct Option: C

The movement of chiasmata towards the ends of paired homologous chromosomes is

  1. terminalization

  2. synapses

  3. diakinesis

  4. none of the above


Correct Option: A

The phase during which nucleus is metabolically most active is

  1. anaphase

  2. interphase

  3. prophase

  4. telophase


Correct Option: B
Explanation:

During Interphase  synthesis of protein, DNA and RNA takes place

The point on the chromosomes at which spindles are attached is

  1. centrioles

  2. centromere

  3. centrosome

  4. nucleolus


Correct Option: B

In the plant cells, the division of cytoplasm takes place by

  1. cleavage

  2. furrowing

  3. invagination

  4. the formation of a cell plate


Correct Option: D
Explanation:

In plant cells, the division of cytoplasm takes place by the formation of a cell plate.

When a cell is treated with 0.1 % colchicine during cell division then

  1. it inhibits spindle formation

  2. division of cytoplasm will be delayed

  3. it will stop cell division

  4. it prevents the functions of nucleolus


Correct Option: A

The phase during which homologous chromosomes come together to form a pair is

  1. leptotene

  2. zygotene

  3. pachytene

  4. diplotene


Correct Option: B

Chiasmata is the point of attachment of two non sister chromatids which is preceded by

  1. crossing over

  2. synapsis

  3. disjunction

  4. terminalization


Correct Option: A

The correct chronology of the events during cell cycle is

  1. S, G1, G2, M

  2. S, G1, M, G2

  3. G1, S, G2, M

  4. G1, S, M, G2


Correct Option: C
Explanation:

The cell cycle or cell-division cycle is the series of events that take place in a cell, leading to its division and duplication of its DNA (DNA replication) to produce two daughter cells. The correct chronology of the events during cell cycle is G1, S, G2, M.

Meiosis actually consists of two divisions in which

  1. both the divisions are reductional

  2. both the divisions are equational

  3. first division is equational and second one is reductional

  4. first division is reductional and second one is equational


Correct Option: D

Daughter cells produced as a result of meiosis have

  1. same set of chromosomes as those of the mother cells

  2. half set of chromosomes as those of the mother cells

  3. double set of chromosomes as those of the mother cells

  4. none of these


Correct Option: B

The number of strands visible in the chromosomes at pachytene stage is

  1. 2

  2. 4

  3. 6

  4. none of the above


Correct Option: B
Explanation:

This is called Tetrad stage with 4 strands

How many times does DNA replication take place during cell cycle?

  1. Many times

  2. Three times

  3. Two times

  4. One time


Correct Option: D

Crossing over occurs between

  1. two sister chromatids of the same chromosome

  2. two non- sister chromatids of the same chromosome

  3. two non-sister chromatids of the homologous chromosome

  4. two sister chromatids of the homologous chromosome


Correct Option: C

How many sub-stages are present in the prophase I of meiosis I?

  1. Two

  2. Three

  3. Four

  4. Five


Correct Option: D

The easiest available material to study mitosis in the school biology laboratory is

  1. ovary

  2. leaf tip

  3. stamen

  4. root tip


Correct Option: D
Explanation:

Roots from onion can be easily grown in the lab.

Mitosis differs from meiosis in the absence of

  1. crossing over

  2. synapsis

  3. tetrad formation

  4. All of the above


Correct Option: D
Explanation:

The correct option is 4.

How many daughter cells will be formed as a result of meiosis in a cell containing 12 chromosomes?

  1. 6

  2. 4

  3. 48

  4. 12


Correct Option: B
Explanation:

Meiosis results into 4 daughter cells. It is irrespective of the number of chromosomes.

During which of the following stages of cell division is the synaptonemal complex is formed?

  1. Mitosis

  2. Meiosis I

  3. Meiosis II

  4. Amitosis


Correct Option: B
- Hide questions