Tag: cell membrane

Questions Related to cell membrane

CPPP which is the important component of sterol is mainly stood for?

bio-chemistry lipids derived lipids biomolecules: chemical constituents of living cells cell membrane

  1. Cyclopentanoperhydrophenanthrene

  2. Pentanoperhydrophenanthrene

  3. Cycloperhydrophenanthrene

  4. None of the above

Show answer
Correct Option: A
Explanation:

CPPP is the abbreviated form of Cyclopentanoperhydrophenanthrene. It is an important component of sterol. Thus the correct answer is option A.

Select the correct option:

Lecithin is a 

bio-chemistry lipids derived lipids biomolecules: chemical constituents of living cells cell membrane

  1. Sterol

  2. Glycolipid

  3. Phospholipid

  4. Sphingolipid

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Correct Option: C
Explanation:

Phospholipids are triglyceride lipids, in which one fatty acid is replaced by phosphoric acid residue often linked to additional nitrogenous group,eg., choline in lecithin.

So, the correxct answer is 'Phospholipid'.

Steroids are

bio-chemistry lipids derived lipids biomolecules: chemical constituents of living cells cell membrane

  1. Tetraterpenes

  2. Polyterpenes

  3. Triterpenes and their derivative

  4. Phenolic compounds

Show answer
Correct Option: C
Explanation:

Steroids are hormonal substances in animals, but they are components of membranes in most organisms. Triterpenes are precursors to steroids in both plants and animals. Steroids are derivatives of triterpenes with 26 or more carbon atoms that have undergone a characteristic type of rearrangement. So, the correct answer is option C.

Two important processes in a cell, which take place outside the membrane bound organelles, are

bio-chemistry lipids derived lipids biomolecules: chemical constituents of living cells cell membrane

  1. Enzyme synthesis and DNA replication

  2. Nucleotide synthesis and mutation

  3. Fatty acid synthesis and spindle assembly

  4. Glycolysis and photophosphorylation

Show answer
Correct Option: C
Explanation:
The process of fatty acid synthesis takes place in the cytoplasm and not in a membrane-bound organelle. Also, spindle assembly takes place in the centrioles which also lack a membrane.

So, the correct answer is 'fatty acid synthesis and spindle assembly'.

When a molecule moves across a membrane independent of other molecules, the process is called (i) Uniport (ii) Symport (iii) Antiport?

bio-chemistry cell membrane active transport and passive transport types of plant transport atp

  1. i

  2. i and ii

  3. i and iii

  4. ii and iii

  5. iii

Show answer
Correct Option: A
Explanation:

When a molecule moves across a membrane independent of other molecule, it is called uniport.

When two molecules move simultaneously across the membrane in the same direction, it is called symport.
When two molecules move in opposite direction to each other across the membrane, it is called antiport. Thus, the correct answer is A.

When a molecule moves across a membrane independent of other molecules, the process is called

bio-chemistry cell membrane active transport and passive transport types of plant transport atp

  1. Uniport

  2. Symport

  3. Antiport

  4. None of these

Show answer
Correct Option: D
Explanation:

A uniporter is an integral membrane protein that transports a single type of substrate species (charged or uncharged) across a cell membrane. It may use either facilitated diffusion and transport along a diffusion gradient or transport against one with an active transport process. They can be either ion channels or carrier proteins. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.

So the correct option is 'None of the above'