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Cell Biology

Description: Cell biology
Number of Questions: 15
Created by:
Tags: Cell biology Plant and Animal Biotechnology
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In a proliferating cell system, how many mitotic divisions are required to produce 1024 cells from a single parent cell?

  1. 10

  2. 20

  3. 512

  4. 1023

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Correct Option: A

Which of the following statements is correct?

  1. Concentration of sodium is higher inside the cell than outside.

  2. Concentration of calcium is higher inside the cell than outside.

  3. Concentration of potassium is higher inside the cell than outside.

  4. Concentration of magnesium is higher inside the cell than outside.

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Correct Option: C

Which of the following statements regarding nucleosomes is incorrect?

  1. They are beaded structures, each with a histone core wrapped in a left-handed super helix of DNA.

  2. The beads are linked by a DNA chain.

  3. Each contains two molecules of histones H2A, H2B, H3 and H4.

  4. The primary structure of the histones is a characteristic of the cell type and the species.

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Correct Option: D

Cell surface receptors may be any of the following, exceptAll the following are cell surface receptors, except

  1. G protein linked

  2. enzymatic receptors

  3. transcription factors

  4. ligand gated ion channels

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Correct Option: C

The type of intercellular signalling in which one cell can communicate with another over a long distance is called

  1. autorine

  2. paracrine

  3. juxtacrine

  4. endocrine

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Correct Option: D

A small molecule diffuses from the cytosol of one cell to the mitochondrial matrix of the neighbouring cell. How many membranes does it traverse?

  1. Two

  2. Three

  3. Four

  4. Five

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Correct Option: C

A cell cultured in colchicines undergoes a complete cell cycle, except for the fact that chromosomes donot migrate to the poles during anaphase. What can be concluded from this?

  1. Colchicines do not affect the microtubules.

  2. DNA replication does not necessarily results in the chromosome separation.

  3. Centromere represent under replicated DNA.

  4. Spindle is made after interphase.

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Correct Option: B

A scientist wishes to synthesise a new drug which will act as an ionophore to deliver Ca2+ across the nerve cell membrane. This drug would most likely be

  1. hydrophobic on the outside and hydrophilic on the inside

  2. insoluble in lipids

  3. soluble in proteins

  4. smaller than 0.001 nm in diameter

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Correct Option: A

Formation of a retinoblastoma eye tumor requires

  1. a germinal mutation in one RB allele, then a somatic mutation in the other allele

  2. a somatic mutation that turns on the RB gene

  3. a germinal mutation in one RB allele

  4. a germinal mutation in the dominant RB allele

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Correct Option: A

When the nucleus of a red blood cell present in a frog, which does not replicates DNA, is transplanted into an enucleated frog egg, the egg goes through several cell divisions. Which of the following is the best interpretation for this phenomenon?

  1. Isolated red blood cell nuclei synthesises DNA.

  2. Nucleus plays no role in cell division.

  3. Enucleated frog egg can divide.

  4. Cytoplasm controls nuclear DNA replication.

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Correct Option: D

Which statement is not true for gap junctions?

  1. They allow the passage of proteins between cells.

  2. They are essential for metabolic cooperation between cells.

  3. They occur in the developing embryo.

  4. They synchronise the beating rate of heart muscle cells.

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Correct Option: A

Choose the mismatched pair(s).

 
Cell organelle Marker molecule
(A) lysosomes acid phosphatase
(B) peroxisomes catalase
(C) mitochondria cytochrome oxidase
(D) SER amino acid permease

  1. Only A

  2. Only B and C

  3. Only D

  4. All of these

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Correct Option: C

Match the following:

 
Column A Column B
1. DNA found at the ends of linear eukaryotic chromosomes A. centromere
2. Protein structure on eukaryotic chromosomes where spindle fibers attach B. telomere
3. DNA site where kinetochores are found C. nucleolar organizer
4. DNA sequence that serves as the template for the synthesis and amplification of ribosomal DNA D. inetochore

  1. 1 – A, 2 – D, 3 – B, 4 – C

  2. 1 – B, 2 – D, 3 – A, 4 – C

  3. 1 – D, 2 – C, 3 – A, 4 – B

  4. 1 – C, 2 – D, 3 – C, 4 – B

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Correct Option: B

A cell has ‘c’ as the DNA content and ‘n’ as the number of chromosomes. What would be the value of ‘c’ and ‘n' immediately before the cell division in case of mitosis?

  1. 2c and 4n respectively

  2. 4c and 4n respectively

  3. 4c and 2n respectively

  4. 2c and 2n respectively

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Correct Option: B

Match List – I with List – II and select the correct code given below:

 
List – I List – II
A. Nucleosome 1. The core of nuclear material containing granules which may be darkly stained with basic dyes
B. Kinetochore 2. A histone octamers associated with DNA
C. Chromomere 3. Disc – shaped protein structure associated with centromeric chromatin
4. Bead – like accumulation of chromatin sometimes visible along chromonema

  1. A - 1, B - 4, C - 3

  2. A - 2, B - 3, C - 4

  3. A - 1, B - 4, C - 2

  4. A - 2, B - 3, C - 1

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Correct Option: B
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