Class X

Human body can synthesize only
  1. 12 amino acids
  2. 10 amino acids
  3. 15 amino acids
  4. 5 amino acids
Nucleotides consists of
  1. Nitrogenous base
  2. phosphate group
  3. all of above
  4. pentose sugar
RNA (Ribonucelic Acid) is made up of
  1. ribose sugar
  2. phosphate unit
  3. nitrogen base
  4. all of above
Enzymes are protein in nature and are used as
  1. biological catalyst
  2. chemical catalyst
  3. reaction inhibitor
  4. reaction stopper
Amino acids which are no synthesized by human body are called
  1. essential amino acids
  2. non essential amino acids
  3. simple amino acids
  4. complex amino acids
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