Biology · 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

Which of the following statements is true of a lysogenic cell?

  1. A cell that harbors an inactive virus in its genome.

  2. A cell that has developed immunity from viral infection.

  3. A cell that undergoes self destruction.

  4. Any cell infected with a virus.

  5. A cell that is about to lyse as a result of viral infection.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the lysogenic cycle of viral infection is a cell that harbors inactive viral DNA in its genome.

Multiple choice

In the process of leucopoiesis, the pleuripotent stem cells give rise to committed stem cells, which are called

  1. myeloblast

  2. myelocyte

  3. progenitor cells

  4. lymphoblasts

  5. interleukins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Progenitor cells are early descendants of stem cells that can differentiate to form one or more kinds of cells. After wounding, only stem cells contribute substantially to the repair and long-term regeneration of the tissue, whereas committed progenitor cells make a limited contribution.

Multiple choice

Where are lymphocytes processed?

  1. Bone marrow

  2. Thymus

  3. Spleen

  4. Bursa of fabricus

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

Thymus is a small organ in the upper chest, under the breastbone. Before birth and during childhood, thymus helps the body to make a type of white blood cells. These cells protect our body from infections.

Multiple choice

Which of the following has the ability to produce the protein colony stimulating factor?

  1. B lymphocytes

  2. T lymphocytes

  3. Basophils

  4. Plasma

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

Colony Stimulating Factors (CSFs) are secreted glycoproteins that bind to receptor proteins on the surfaces of hematopoietic stem cells, and stimulate stem cells in bone marrow to form specialised white blood cells that defend the body against infection from viruses. It can also be produced by fibroblasts, macrophages and endothelial cells.