Which of these biomolecules is an essential component of the plasma membrane?
Phospholipids
The plasma membrane of all cells is made up primarily of a phospholipid bilayer, with embedded proteins, glycolipids and cholesterol (in animal cells).
Each phospholipid has a hydrophilic (water-loving) phosphate head and two hydrophobic (water-fearing) fatty-acid tails. They arrange themselves into a bilayer in aqueous environment, forming the basic structural framework of the membrane.
Cellulose is found in plant cell walls (not the plasma membrane); DNA is the genetic material located in the nucleus; glycogen is a storage carbohydrate in animal cells.
Hence the correct answer is option 2) Phospholipids.
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Important Questions from Biomolecules
The chemical name of Vitamin D 3is:
Which of the following food comes under complex carbohydrate?
I. Potatoes
II. Sweets
III. Pasta
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Following are the pKa's of the ionizable groups in lysine
pKa 1 = 2.16 (α - carboxylic group)
pKa 2 = 9.06 (α - amino group)
pKa 3 = 10.54 (ε - amino group)
Which one of the following options represents the pl of lysine?
How many hydrogen bonds involving the backbone CO and NH can be observed in an α‐helix consisting of 15 amino acid residues?
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