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Question

Most cell membranes are composed principally of
  1. DNA and ATPs
  2. Protein and lipids
  3. Chitin and starch
  4. Nucleotides and amino acids

A
Protein and lipids
B
DNA and ATPs
C
Chitin and starch
D
Nucleotides and amino acids
Solution
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Plasma membrane is a living thing, delicate, elastic and selectively permeable membrane. It is made up of phospholipid bilayer and protein molecules embedded within.
Hence the correct option is B.

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