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/are correct about epidermis?

a. The epidermis is usually made of a single layer of cells. b. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. c. Epidermal cells are flat and have lots of intercellular spaces.

  1. a, b and c

  2. a only

  3. b only

  4. c only

  5. a and b
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as both statements are correct. The epidermis is usually made of a single layer of cells. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface.

Multiple choice

In which type of epidermal cells are Birbeck granules present?

  1. Merkel cells

  2. Melanocytes

  3. Keratinocytes

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

Birbeck granules are present in Langerhans cells. Their function is still not certain but they migrate to the periphery of the Langerhans cells and release its contents into the extracellular matrix.

Multiple choice

What is the dermis layer composed of?

  1. Squamous epithelial tissue

  2. Areolar connective tissue

  3. Adipocytes

  4. Columnar epithelium tissues
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dermis is composed of areolar connective tissue such as collagen with elastin arranged in a diffusely bundled and woven pattern.

Multiple choice

What is paronychium in nail?

  1. An infection

  2. Border tissue

  3. Small band of living cells

  4. Nail bed protection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The paronychium is the border tissue around the nail.

Multiple choice

Which of the following statements is/are correct about a nucleus?

a. A nucleus has a double layered covering called nuclear membrane. b. A nucleus contains chromosomes. c. A nucleus plays a central role in cellular nutrition.

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

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

This is the correct answer as both the statements are correct. A nucleus has a double layered covering called nuclear membrane. A nucleus contains chromosomes. These chromosomes are visible as rod-shaped structures, only when the cell is about to divide.

Multiple choice

Which of the following statements about cytoplasm is incorrect?

  1. It is the fluid content inside the plasma membrane.

  2. It contains many specialised cell organelles.

  3. It is the site of many biochemical reactions.

  4. It has its own genetic material.

  5. It gives the cell its volume and shape.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer as the cytoplasm does not have its own genetic material.

Multiple choice

Which of the following organelles serve as a channel for the transport of materials between the cytoplasm and the nucleus?

  1. Lysosomes

  2. Cytoplasms

  3. Golgi apparatus

  4. Mitochondria

  5. Endoplasmic reticulum
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer. The endoplasmic reticulum (ER) is a large network of membrane-bound tubes and sheets. ER serves as a channel for the transport of materials (especially proteins) between various regions of the cytoplasm or between the cytoplasm and the nucleus.

Multiple choice

Which of the following pairs is/are correct?

a. Mitochondria - powerhouse of the cell b. Vacuole - suicidal bags of the cell c. RNA - energy currency of the cell

  1. a, b and c

  2. a and b

  3. a and c

  4. b and c

  5. a only
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as a is the correct pair. The mitochondria is called the powerhouse of the cell because it is responsible for producing most of the cell's energy or adenosine tri-phosphate (ATP).