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

A doctor explained to a couple that their son is suffering from a cancer which derives from epithelial cells of the body. Which among the following cancers must the doctor be referring to?

  1. Blastoma

  2. Germ cell tumor

  3. Lymphoma and leukemia

  4. Sarcoma

  5. Carcinoma
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Cancers derived from epithelial cells. This group includes many of the most common cancers, particularly in the aged, and include nearly all those developing in the breast, prostate, lung, pancreas, and colon.

Multiple choice

A heterogeneous group of high-grade carcinomas is referred to as

  1. small cell carcinoma

  2. large cell carcinoma

  3. anaplastic carcinoma

  4. squamous cell carcinoma

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

Refers to a heterogeneous group of high-grade carcinomas that feature cells lacking distinct histological or cytological evidence of any of the more specifically differentiated neoplasms. These tumors are referred to as anaplastic or undifferentiated carcinomas.

Multiple choice

Which of the following organelles is credited for the emergence of Nissl bodies in the cell bodies of motor neurons?

  1. The smooth endoplasmic reticulum

  2. The rough endoplasmic reticulum

  3. The basal ganglia

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

The surface of the rough endoplasmic reticulum is studied with protein-manufacturing ribosomes giving it a rough appearance. It is credited for the emergence of Nissl bodies in the cell bodies of motor neurons.

Multiple choice

What characteristic domain is found in eukaryotic proteins that enable them to enter the endoplasmic reticulum?

  1. Stop transfer domain

  2. Signal sequence

  3. Signal sequence receptor

  4. Signal recognition protein
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The proteins that are designated to enter endoplasmic reticulum for post translational modification bear a characteristic signal sequence generally on their N terminal that is used by specific receptor in ER membrane to make its entr yin to ER lumen.

Multiple choice

Genes whose products are constantly needed for the maintenance of the cells are called

  1. inducible genes

  2. constitutive genes

  3. facultative genes

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

A housekeeping gene is typically a constitutive gene that is transcribed at a relatively constant level. The housekeeping gene's products are typically needed for maintenance of the cell. It is generally assumed that their expression is unaffected by experimental conditions. Examples include actin, GAPDH and ubiquitin.

Multiple choice

Which among the following types of cells are involved in the production of cerebrospinal fluid (CSF)?

  1. Oligodendroctyes

  2. Ependymal cells

  3. Pyramidal cells

  4. Glial cells

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

Ependyma is the thin epithelium-like lining of the ventricular system of the brain and the central canal of the spinal cord. Ependyma is one of the four types of neuroglia in the central nervous system (CNS). It is involved in the production of cerebrospinal fluid (CSF).

Multiple choice

Which of the following statements regarding a cell wall is false?

  1. It occurs in a plant cell.

  2. It lies inside a cell.

  3. It is non-living and quite thick in plant cells.

  4. It is formed of cellulose, hemicellulose and pectin.

  5. Its function is to provide protection and strength to a cell.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option.