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 for platelets?

  1. They are irregularly amoeboid shaped.

  2. They are the least abundant formed element of blood.

  3. They have a life span of 3-7 years.

  4. They are non-nucleated fragments of giant cells.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

They are the non- nucleated fragments of megakaryocytes of bone marrow.

Multiple choice

Binary fission occurs during _______.

  1. favourable conditions

  2. unfavourable conditions

  3. hot conditions

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

Binary (Bi means two) fission produces only two daughter cells and occurs repeatedly, generation after generation, in short time intervals. This fast reproduction is possible only under favourable conditions of temperature, food and humidity. But under unfavourable conditions like high or low temperature, low humidity or lack of food, multiple fission occurs.

Multiple choice

Which of the following cells helps to carry out regeneration?

  1. broken cells

  2. normal cells

  3. specialized cells

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

Regeneration is carried out by specialized cells, which can proliferate at a fast rate. Also, they can form all the different cells that are required to form the body part that the organism needs to regenerate. Broken cells may not proliferate while “all cells” cannot have the above mentioned specialized features. Differentiated cells take up a fixed role and may not be able to produce all the cells required in regeneration.