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

In phosphorylation, ATP is synthesised in which of the following parts of cells?

  1. Mitochondria and nucleus

  2. Nucleus and chloroplast

  3. Mitochondria and chloroplast

  4. Golgi apparatus and ribosomes

  5. Ribosomes and chloroplast
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Yes, it is correct. Living organisms have the capability of extracting energy from oxidisable substances and store this in the form of bond energy. ATP, carry this energy in their chemical bonds. In phosphorylation ATP is synthesised by cells in mitochondria and chloroplasts.

Multiple choice

The size of a cell depends upon

  1. its oxygen requirement

  2. its minerals and materials requirement

  3. regulation ability of its nucleus

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The size of a cell depends upon its oxygen requirement, its minerals and materials requirement and the regulation ability of its nucleus.

Multiple choice

_______ can change its shape continuously.

  1. Nerve fibre

  2. White blood cell

  3. Red blood cell

  4. Muscle fibre
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

White blood cells protect the body against infection, and they can change their shapes continuously.

Multiple choice

The smaller the cell, the

  1. smaller the nucleus

  2. more it will be active metabolically

  3. less it will be active metabolically

  4. larger the nucleus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The smaller the cell, the more it will be active metabolically. For e.g., RBCs which are smaller as compared to other body cells carry the maximum oxygen to body parts.

Multiple choice

Cellular totipotency is demonstrated by

  1. all nucleated eukartyotic cells

  2. bacterial cells

  3. all plant cells

  4. only gymnosperm cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Totipotency is the ability of a single cell to divide and produce all the differentiated cells in an organism, and it is demonstrated by all nucleated eukaryotic cells.

Multiple choice

The lipoprotein, single unit membrane of ER is

  1. thinner than cell membrane

  2. thicker than cell membrane

  3. similar to cell membrane

  4. rich in lipids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The lipoprotein, single unit membrane of ER is thinner than cell membrane so as to transport proteins and lipids to body parts.

Multiple choice

Lysosomes are called 'suicidal bags' because of

  1. phagocytic activity

  2. hydrolytic enzymes

  3. proteolytic enzymes

  4. oxidase enzymes

  5. all of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lysosomes are called 'suicidal bags' because of hydrolytic enzymes, which digest their own cell organelles.