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

During cell division in animal cells the spindle fibers are formed by

  1. cytoplasm

  2. centrioles

  3. nucleolus

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

During cell division in animal cells, the spindle fibers are formed by centrioles. Centrioles organize the microtubules that make up the spindle apparatus, which helps separate chromosomes during mitosis and meiosis.

Multiple choice

Molecular and cellular defect of cystic fibrosis is the

  1. defective chloride channel in epithelial cells leading to excessive mucus in the lungs

  2. defective chloride channel in the epithelial cells leading to no mucus in the lungs

  3. defective sodium channel in the epithelial cells leading to excessive mucus in the lungs

  4. defective sodium channel in the epithelial cells leading to no mucus in the lungs

  5. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Defective chloride channel in epithelial cells leads to excessive mucus in lungs

Multiple choice

Centrioles have tubular arrangements of

  1. 9 + 11

  2. 8 + 1

  3. 9 + 0

  4. 9 + 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Centrioles and basal bodies have a 9+0 microtubule arrangement - nine triplet microtubules in the outer ring with no central microtubules. The 9+2 arrangement is found in cilia and flagella axonemes.

Multiple choice

What is look like long tubules or round or oblong bags ?

  1. Vacuoles

  2. Golgi apparatus

  3. Endoplasmic reticulum

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

The Endoplasmic Reticulum (ER) is a large network of membrane-bound tubes and sheets. It appears as long tubules or round or oblong bags (vesicles) and is involved in protein and lipid synthesis.

Multiple choice

____________ small size in animals.

  1. Vacuoles

  2. Golgi apparatus

  3. Endoplasmic reticulum

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

Vacuoles are typically small and temporary in animal cells, whereas they are large and permanent in plant cells. They help in maintaining osmotic pressure and storing nutrients in animals.

Multiple choice

______________ involve in the formation of lysosomes.

  1. Vacuoles

  2. Golgi apparatus

  3. Endoplasmic reticulum

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

The Golgi apparatus is involved in the formation of lysosomes, which are the cell's waste disposal system. It packages digestive enzymes into membrane-bound vesicles that become lysosomes.