Biology ยท Science General

Cell Biology and Structure

3,062 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 statements is not stated in cell theory?

  1. Cells are the basic structural units of living organisms.

  2. New cells are formed due to division in old cells.

  3. All cells are identical.

  4. The way an organism functions depends on the way the cells work.

  5. The organisation of cells in the body of a living organism determines its structure.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

No, this statement is not stated in cell theory. All cells are similar in their basic structure and function, but are not identical.

Multiple choice

Which of the following statements is/are false?

a. All cells are capable of carrying out basic functions like nutrition, respiration, growth and reproduction. b. All the cells use different mechanisms for energy metabolism. c. In multicellular organisms, cells are specialised to perform different functions of the body so that there is a division of labour within the cell.

  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
C Correct answer
Explanation

This is the correct option as this statement is false. All the cells use same basic, and not different mechanisms for energy metabolism.

Multiple choice

In a multicellular organism, the shape of a cell depends upon the

  1. functional adaptations

  2. surface tension

  3. viscosity of the protoplasm

  4. All of the above

  5. mechanical action exerted by the adjoining cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as in a multicellular organism, the shape of a cell depends upon functional adaptations, surface tension, viscosity of the protoplasm and mechanical action exerted by the adjoining cells. In a multicellular organism, the shape of a cell depends upon the mechanical action exerted by the adjoining cells. But, other factors are also responsible like functional adaptations, surface tension, viscosity of the protoplasm, etc.

Multiple choice

Which of the following cells are discoidal?

  1. Pigment cells of the skin

  2. Red blood cells

  3. Nerve cells

  4. Smooth muscle fiber cells

  5. Chromatophores
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. Red blood cells are discoidal in shape.

Multiple choice

The process by which the membrane of a vesicle can fuse with the plasma membrane and extrude its contents to the surrounding medium is called ____________.

  1. phagocytosis

  2. photocytosis

  3. endocytosis

  4. exocytosis

  5. receptor-mediated endocytosis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. The process by which the membrane of a vesicle can fuse with the plasma membrane and extrude its contents to the surrounding medium is called exocytosis.