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

Tissues which take up stains are called

  1. Chromatic

  2. Stain receiver

  3. Acid-fast

  4. Gram negative

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

Tissues which take up stains are called chromatic. Chromosomes were so named because of their ability to absorb a violet stain.

Multiple choice

Which of the following organelles are involved in photo respiration?

  1. Mitochondria and glyoxysomes

  2. Mitochondria, nucleus and ribosomes

  3. Mitochondria, chloroplasts and peroxysomes

  4. Mitochondria, chloroplasts and ribosomes

  5. Mitochondria, glyoxysomes and ribosomes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mitochondria is called the power house of  cell. As photosynthesis takes place in chloroplasts, it needs proteins for initiating the reaction. So, photo respiration takes the aid of mitochondria, chloroplasts and peroxysomes.

Multiple choice

The powerhouse of the cell is known as

  1. ribosome

  2. mitochondria

  3. liver

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mitocondria are known as the powerhouses of the cell because they generate most of the cell's supply of adenosine triphosphate (ATP). This ATP is used as a source of chemical energy for various cellular processes. Ribosomes are involved in protein synthesis, and the liver is an organ.

Multiple choice

Melanoma is cancer of :

  1. Epithelial cells

  2. Melanocytes

  3. Hematopoietic cells

  4. Bones and cartilages
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is a cancerous growth of melanocytes.

Multiple choice

Ubish granules containing sporopollenin are produced by

  1. endothelium

  2. middle layers

  3. tapetum

  4. epithelium

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The tapetum is the innermost layer of the anther wall. It is responsible for secreting sporopollenin, which forms the Ubisch granules that contribute to the outer exine layer of pollen grains.

Multiple choice

Which of the following facts are true about stem cells?

  1. They are manufactured in a laboratory.
  2. They can reproduce any kind of tissue in the body.
  3. They are an essential part of the repair system of a body.

  1. 1 and 2

  2. 2 and 3

  3. 1 and 3

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Stem cells are biological cells found in all multi-cellular organisms that can divide (through mitosis) and differentiate into diverse specialised cell types and can self-renew to produce more stem cells. Hence, fact 1 is incorrect.

Multiple choice

To what does the term stroma refer?

  1. The double membrane of the chloroplasts

  2. A flattened disk or sac in the chloroplast

  3. A central fluid filled space in the chloroplast

  4. The cytochrome system in the membranes of the thylakoids

  5. A stack of thylakoid membrane structures

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The stroma is the fluid-filled space within the chloroplast that surrounds the thylakoid membranes, where the Calvin cycle occurs.