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

Which of the following is the function of a cell wall?

  1. It helps in plasmolysis when dipped in hypotonic solution.

  2. It prevents plasmolysis when dipped in hypotonic solution.

  3. It prevents plasmolysis when dipped in isotonic solution.

  4. It helps in plasmolysis when dipped in isotonic solution.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cell wall prevents plasmolysis when dipped in hypotonic solution.

Multiple choice

Collenchyma is

  1. living and contains protoplasm

  2. dead and hollow

  3. dead and filled with reserve food

  4. living and contains no reserve food

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

Collenchyma cells have thin primary walls with some areas of secondary thickening. Collenchyma provides extra structural support, particularly in regions of new growth.

Multiple choice

Centrosome is not present in

  1. cells of higher plants

  2. cells of lower plants

  3. cells of higher animals

  4. cells of lower animals.

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

Centrosome is required in the formation of centrioles which is required during cell division mainly in animals.It is absent in plants.

Multiple choice

Chondrocytes are cells of ______.

  1. blood

  2. tendon

  3. bone

  4. cartilage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chondrocytes are the only cells found in a healthy cartilage. They produce and maintain the cartilaginous matrix, which consists mainly of collagen and proteoglycans. 

Multiple choice

Undifferentiated totipotent cells of sponges are

  1. archeaocytes

  2. porocytes

  3. trophocytes

  4. myocytes

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

Archeaocytes are amoeboid cells that are found in sponges. They are totipotent and have varied functions, depending on the species.

Multiple choice

Cell membrane

  1. controls exocytosis

  2. controls endocytosis

  3. controls both endocytosis and exocytosis

  4. does not control movement of substances

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane and bringing it into the cell. Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell.