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

Cell wall material is secreted by

  1. lysosomes

  2. golgi bodies

  3. mitochondria

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

Cell wall material is secreted by golgi bodies like the glycoproteins and glycolipids.

Multiple choice

Intussusception occurs in

  1. mature cell

  2. young cell

  3. both mature and young cell

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

 Intussusception occurs in young cell.

Multiple choice

Composition and structure of the cell membrane is

  1. Lipoproteinaceous & Bilaminar

  2. lipoproteinaceous and trilaminar

  3. lipoproteinaceous and tetralaminar

  4. phosphoproteinaceous and trilaminar
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Composition and structure of  cell membrane is lipoproteinaceous and trilaminar. Trilaminar means that it is made of two layers of lipids and one of proteins.

Multiple choice

Folds of plasma membrane in bacterial cells are known as

  1. episomes

  2. mesosomes

  3. spherosomes

  4. acrosomes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Mesosomeman organelle of bacteria that appears as an invagination of the plasma membrane and functions either in DNA replication and cell division or excretion of exoenzymes.

Multiple choice

Which of the following tissues have cell walls composed of cellulose only?

  1. Collenchyma

  2. Sclerenchyma

  3. Sclereids

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

Cells are isodiametric i.e. equally expanded on all sides. They may be oval, round, polygonal or elongated. Nucleus is present and hence living. The cell walls are thin and made of cellulose only. Cytoplasm is dense with a single large vacuole. Intercellular spaces may be present.

Multiple choice

Which one is not a characteristic feature of meristamatic tissue?

  1. Smaller cells

  2. Helps in storage and respiration

  3. The cell wall is composed of cellulose only

  4. A conspicuous nucleus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parenchyma is mainly involved in functions, like storage and respiration. It also takes part in other functions like, photosynthesis, absorption, secretion and protection.