Biology · Science General

Cell Biology and Structure

3,221 Questions

Cell biology focuses on the structure and function of cellular organelles. Key topics include cellular respiration, DNA inheritance, and energy production. These fundamental biology concepts are crucial for medical entrance and state service examinations.

Cell organelles functionsCellular respiration sitesDNA and ribosomesAnimal cell structurePlant cell components

Cell Biology and Structure Questions

Multiple choice

Given below are some functions of cell organelles. Which of these is the function of the inner membrane of mitochondria?

  1. Plays a central role in cellular reproduction

  2. Contains DNA on which genes are present

  3. Site of cellular respiration

  4. The protein synthesizing site of the cell

  5. Storage units in cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mitochondria is the site of cellular respiration in presence of oxygen and ATP formation. This is the correct function of the inner membrane of mitochondria.

Multiple choice

Which of the following cell organelles has the given properties?

Directions: Read these properties carefully and answer the question that follows.
  
1. Found in plant cells only
2. Double membrane bounded structures
3. Do not have cristae but have extra nuclear DNA

  1. Mitochondria

  2. Cytoplasm

  3. Cytosol

  4. Protoplasm

  5. Plastids
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. Plastids are found in plant cells only. They are double membrane bounded structures. They do not have cristae but have extra nuclear DNA. Chromoplasts are colored plastids and leucoplasts are colorless plastids.

Multiple choice

Which of the following statements is incorrect?

  1. The nucleus contains cytoplasms, which are visible as rod-shaped structures, only when the cell is about to divide.

  2. The nuclear membrane has pores, which allow the transfer of material from inside the nucleus to outside.

  3. The functional segments of DNA are called genes.

  4. Rough endoplasmic reticulum has ribosomes on it.

  5. Viruses lack any membranes, and hence do not show characteristics of life until they enter a living body.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, this statement is incorrect, hence the correct answer. The nucleus contains chromosomes, not cytoplasms, which are visible as rod-shaped structures, only when the cell is about to divide. 

Multiple choice

Which of the following organelles is the site for centrioles?

  1. In centrosomes of plant cell only.

  2. In centrosomes of animal cell only.

  3. In centrosomes of plant and animal cells.

  4. In cytoplasm of plant cell only.

  5. In cytoplasm of animal cell only.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Centrioles are found in centrosome of animal cells only. This is the correct option.

Multiple choice

Which pair of chemicals would prevent the formation of microtubules in cytoplasm?

  1. Nicotine and cyanide

  2. Ricin and cocavalin

  3. Rotenone and vinchristine

  4. Colchicine and vinblastin

  5. Oubain and ricin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Colchicine inhibits microtubule polymerization by binding to tubulin, one of the main constituents of microtubules. Vinblastine is an antimicrotubule drug used to treat certain kinds of cancer.

Multiple choice

Which of the following statements is/are false?

a. The kingdom Protoctista is a collection of all the eukaryotic organisms that do not fit neatly into the other three eukaryotic kingdoms. b. A group of organisms that does not fit neatly into any classification scheme are the viruses. c. Viruses have a cellular structure and can only reproduce by invading the living cells.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. Viruses do not have a cellular structure and can only reproduce by invading the living cells.

Multiple choice

Ageing is characterised by reduction in size of ____.

  1. telomerase

  2. propase

  3. hectomase

  4. sectomase
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dyskeratosis congenita is a premature ageing syndrome characterized, which cause a reduction in telomerase activity and give rise to disease. The size of peak signal intensity was determined by using the UVP Gelpro.