Biology ยท 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

What makes up 'Protoplasm'?

  1. Cytoplasm + Nucleusplasm

  2. Cytoplasm + Organelles - Cytoplasm

  3. Cytoplasm - Organelles

  4. Cytoplasm - Nucleus + Organelles
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Protoplasm is defined as the living part of the cell, which includes the cytoplasm and the nucleoplasm (the fluid inside the nucleus).

Multiple choice

Which of the following statements are FALSE regarding bacterial cell? P. The bacterial cell wall is composed of cellulose. Q. Endoplasmic reticulum is not found in bacterial cell. R. Mesosomes are site of localisation of respiratory enzymes. S. Pili are used for attachment to surfaces for colonisation of bacteria.

  1. Only P and Q

  2. Only P and R

  3. Only P and S

  4. Only Q and R

  5. Only R and S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria are protected by a rigid cell wall composed of peptidoglycans. Fimbriae are used for attachment to surfaces for colonisation while pili are used to transfer genetic material during sexual reproduction of bacteria.

Multiple choice

Which of the following statements is not true about plasma membrane?

  1. It is the outermost covering of the cell that separates the contents of the cell from its external environment.

  2. It provides shape to the cell.

  3. It is a selectivity permeable membrane.

  4. It is made up of lipids and proteins only.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

While the plasma membrane is made of lipids and proteins, it also contains carbohydrates (as glycoproteins or glycolipids), making the statement that it is made of lipids and proteins 'only' incorrect.

Multiple choice

Which of the following statements is not true according to the cell theory?

  1. All the living organisms are made up of cells.

  2. Cell is the basic unit of life.

  3. Cells contain components called organellae.

  4. Cells arise from pre-existing cells.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell theory states that all living organisms are made of cells, the cell is the basic unit of life, and cells arise from pre-existing cells. The presence of organelles is a feature of eukaryotic cells, not a core tenet of cell theory.

Multiple choice

Which of the following statements is not true for nucleus?

  1. It is covered by a double membrane structure.

  2. It has chloroplasts.

  3. It contains DNA.

  4. It plays a key role in cell reproduction.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chloroplasts are organelles found in the cytoplasm of plant cells, not within the nucleus.

Multiple choice

Which of the following statements is not true for mitochondria?

  1. It contains DNA.

  2. It is called as power of house.

  3. It has a double membrane.

  4. It contains digestive enzymes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mitochondria are known as the powerhouse of the cell because they produce ATP. Digestive enzymes are primarily found in lysosomes, not mitochondria.