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

Match the following:

Cell types Function
1. Lophocytes a. Secrete spicules
2. Rhabdiferous cells b. Secrete polysaccharides
3. Sclerocytes c. Contraction
4. Myocytes d. Secrete collagen fibres
  1. 1. Lophocytes c. Contraction
    2. Rhabdiferous cells a. Secrete spicules
    3. Sclerocytes d. Secrete collagen fibres
    4. Myocytes b. Secrete polysaccharides
  2. 1. Lophocytes b.Secrete polysaccharides
    2. Rhabdiferous cells a. Secrete collagen fibres
    3. Sclerocytes c. Contraction
    4. Myocytes d. Secrete collagen fibers
  3. 1. Lophocytes d. Secrete collagen fibres
    2. Rhabdiferous cells b. Secrete polysaccharides
    3. Sclerocytes a. Secrete spicules
    4. Myocytes c. Contraction
  4. 1. Lophocytes a. Secrete spicules
    2. Rhabdiferous cells d. Secrete collagen fibres
    3. Sclerocytes b. Secrete polysaccharides
    4. Myocytes c. Contraction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct match.

Multiple choice

Match the following macrophages to the site of localisation that they differentiate in.

 
MACROPHAGE SITE
I. Kupffer cells a. Bones
II. Splenic macrophages b. Kidneys
III. Osteoclasts c. White pulp
IV. Mesangial cells d. Liver

  1. I - d, II - b, III - c, IV - a

  2. I - c, II - a, III - b, IV - d

  3. I - d, II - c, III - a, IV - b

  4. I - d, II - b, III - a, IV - c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Monocytes migrate through the blood stream to various tissues where they undergo further differentiation into variety of histological forms. Kupffer cells in liver, osteoclasts in bones, splenic cells in white pulp of spleen and mesangial cells in kidneys.

Multiple choice

All the bacterial cells have the following constant structures except

  1. cell membranes & proteins

  2. cytoplasm & nucleoid

  3. nucleoid & ribosomes

  4. cell wall & thylakoid

  5. cell membranes & lipids
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cell wall is common to all bacterial cells except a few like mycoplasmas. Similarly, thylakoids are the specialized membranes of flattened discs that contain light sensitive pigments. These structures are commonly present in cyanobacteria - the photosynthetic bacteria, and they help in photosynthesis. Therefore, these structures are not common to all bacterial cells.

Multiple choice

Why is the inner membrane of mitochondrion deeply folded?

  1. To provide large surface area for synthesis of glucose

  2. To provide large surface area for synthesis of lipids

  3. To provide large surface area for packaging of proteins

  4. To provide large surface area for ATP-generating chemical reactions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mitochondrion has two membrane coverings. The outer membrane is very porous, while the inner membrane is deeply folded. These folds create a large surface area for ATP-generating chemical reactions.