Biology ยท 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

Which of the following is not true about a cell?

  1. A cell has four functional regions.

  2. A cell is the basic unit of all organisms.

  3. Cell is alive.

  4. Robert Hook discovered the cell.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A cell has only three functional regions - plasma membrane, nucleus and cytoplasm.

Multiple choice

Why are cell organelles important for a cell?

  1. For cell protection

  2. Gives shape and size

  3. Basic unit of a organism

  4. Functional unit of a cell
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A cell organelle is a functional unit of a cell, which performs all activities, like respiration, photosynthesis, etc.

Multiple choice

Which statement is not related to nucleus?

  1. Robert Brown discovered the nucleus.

  2. It is the largest cell structure.

  3. It contains plastids.

  4. It is centrally located in a cell.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nucleus does not contain plastids. It is found in cytoplasm of a plant cell.

Multiple choice

Which of the following statements defines the term 'division of labour'?

  1. Movement of a substance from one region to another

  2. The passage of water from a region of higher concentration through a semi -permeable membrane

  3. Release of energy

  4. Organism have different organs for different functions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Division of labour means multicellular organisms like human beings have different body parts for different functions.

Multiple choice

What are the specialized structures formed with cytoplasmic membrane and outer membrane when gram-negative cells are treated with the enzyme lysozyme?

  1. Spheroplast

  2. Protoplast

  3. Thylakoids

  4. Mesosomes

  5. Magnetosomes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If peptidoglycan is digested away from the cell, gram-positive cells lose their cell walls and become protoplasts while the gram negative cells become spheroplasts. A spheroplast is a cell from which the cell wall has been almost completely removed as by the action of penicillin. The name stems from the fact that after a microbe's cell wall is digested, membrane tension causes the cell to acquire a characteristic spherical shape.