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

Protoplast is

  1. a cell membrane

  2. a cytoplasm

  3. a cell organelle

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This protoplasm is of a living plant or bacterial cell whose cell wall has been removed.

Multiple choice

________ are microbodies.

  1. Peroxisomes

  2. Glyoxisomes

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A microbody is a type of organelle that is found in the cells of plants, protozoa and animals. Organelles in the microbody family include peroxisomes, glyoxysomes, glycosomes and hydrogenosomes. In vertebrates, microbodies are especially prevalent in the liver and kidney organs.

Multiple choice

______ loses nucleus at maturity.

  1. Mammalian RBC

  2. WBC

  3. Brain cell

  4. Liver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mature red blood cell contains no internal membranous structures. The mature cell has no nucleus and no organelles. As red blood cells develop and mature in bone marrow, the nucleus and organelles completely deteriorate.

Multiple choice

Primary cell walls are present in

  1. meristematic cells

  2. parenchymatous cells

  3. cell of leaves and fruits

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The cell wall forms outside the plasma membrane initially as a thin primary cell wall. Thereafter, the primary cell wall may thicken or a more durable secondary cell wall can form between the primary cell wall and plasma membrane. All the above given structures have primary cell wall.

Multiple choice

Organelles that are surrounded by two membranes are

  1. Nucleus and mitochondria

  2. Nucleus and golgi bodies

  3. Endoplasmic reticulum and lysosomes

  4. Endoplasmic reticulum and mitochondria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Golgi body, lysosomes and endoplasmic reticulum are single membrane bound organelles.

Multiple choice

Which of the following statements is not correct?

  1. In plant cells, vacuoles are absent

  2. Vacuole is bound by single membrane

  3. In Ameoba, contractile vacuole is important for excretion

  4. Flagellum is important for locomotion by bacteria
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In plant cells vacuoles are present. All other statements are correct.

Multiple choice

Which of the following statements is correct about plasma membrane?

  1. It allows all cells to pass into and out of cells

  2. It prevents all substances from passing into and out of cell

  3. It is composed of mainly a protein bilayer

  4. It is composed mainly of a lipid bilayer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plasma membrane is selectively permeable and is made up of lipids.

Multiple choice

Nucleus is concerned with

  1. Entry and exit of materials

  2. Transmission of genetic character

  3. production of energy

  4. Secretion of enzymes and proteins
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Entry and exit of materials-cell membrane, production of energy-mitochondria, secretion of enzymes and proteins- Golgi apparatus