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 coenocytic organism structure has

  1. a single nucleus

  2. more than one nucleus in a cell

  3. one cell

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

A nuclear division without corresponding cell division results in multinucleate organism. Such organisms are called coenocytic.

Multiple choice

Due to which of the following reasons is a cell said to be an autonomous unit?

  1. It contains nucleus.

  2. It can communicate with other cells.

  3. It can reproduce.

  4. It independently carries out all the fundamental biological processes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell is autonomous because it independently carries out all fundamental biological processes like respiration, excretion, reproduction, energy utilisation, etc.

Multiple choice

Which of the following cells maintains the pH of the extracellular space of the CNS in mammals?

  1. Ependymal cell

  2. Oligodendrocytes

  3. Fibrous astrocytes

  4. Pituicyte

  5. Neural stem cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fibrous astrocytes are found throughout all white matter. They perform many functions including biochemical support of endothelial cells that form the blood–brain barrier, distribution of nutrients to the nervous tissue and the maintenance of extracellular pH balance.

Multiple choice

Krebs cycle occurs in

  1. cytoplasm

  2. mitochondria

  3. chloroplast

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

The Krebs cycle occurs in the mitochondrial matrix and generates a pool of chemical energy (ATP, NADH, and FADH2) from the oxidation of pyruvate, the end product of glycolysis.

Multiple choice

Where does Krebs cycle take place?

  1. Cytoplasm

  2. Endoplasmic reticulum

  3. Mitochondria

  4. Ribosomes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Krebs cycle takes place in mitochondria.It is a series of chemical reactions used by all aerobic organisms to generate energy through the oxidation of acetate derived from carbohydrates, fats and proteins into carbon dioxide and chemical energy in the form of ATP.