Biology · 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

Epithelial tissues are the tissues that cover the whole surface of a body. Which of the following statements is/are not true?

a. Epithelial tissue has a free surface that faces either a body fluid or the outside environment. b. In them, the cells are compactly packed with little intercellular matrix. c. They perform the function of linking and supporting other tissues and organs of the body.

  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 is not a property of epithelial tissue. The connective tissues perform the function of linking and supporting other tissues and organs of the body.

Multiple choice

Match the following:

 
a. Squamous epithelium 1. It is made of a single thin layer of flattened cells with irregular boundaries.
b. Cuboidal epithelium 2. It is made of a single layer of tall and slender cells.
c. Columnar epithelium 3. It is made of a single layer of cube-like cells.

  1. a - 2, b - 3, c - 1

  2. a - 3, b - 1, c - 2

  3. a - 1, b - 3, c - 2

  4. a - 1, b - 2, c - 3

  5. a - 2, b - 1, c - 3
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option. Squamous epithelium is made of a single thin layer of flattened cells with irregular boundaries. Cuboidal epithelium is composed of a single layer of cube-like cells. Columnar epithelium is composed of a single layer of tall and slender cells.

Multiple choice

The positive terminal of a cell is represented by

  1. long horizontal line

  2. long vertical line

  3. short horizontal line

  4. short vertical line

  5. two parallel lines
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yes, it is correct. The two parallel lines represent the cell from which the long vertical line shows the positive terminal.

Multiple choice

Which of the following statements is/are false?

a. A cell is a group of tissues having a common origin and generally performing a common function. b. Within angiosperms, the monocots and dicots are seen to be anatomically different. c. During the formation of the primary plant body, specific regions of the apical meristem produce dermal tissues, ground tissues and vascular tissues.

  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
A Correct answer
Explanation

This is the correct option as this statement is false. A tissue is a group of cells having a common origin and generally performing a common function.

Multiple choice

Which of the following statements is/are false?

a. In plants, the growth by cell division occurs continuously throughout their life span. b. In animals, cell division occurs in certain tissues to replace lost cells. c. A multicellular organism grows by cell division, but a unicellular organism does not grow by cell division.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

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

This is the correct option as this statement is false. Both multicellular organisms and unicellular organisms grow by cell division.