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Biomolecules (Biology) · Question 74

AIPMT 2007MCQEasy📈 Topic in 38% papers+4−1
1

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and

  1. sulphur and magnesium
  2. magnesium and sodium
  3. calcium and phosphorus
  4. phosphorus and sulphur

Answer

(4) phosphorus and sulphur

Solution

The six major elements of living matter are C, H, O, N, P and S (often remembered as CHNOPS). They form all the major biomolecules — carbohydrates, lipids, proteins and nucleic acids — and together make up about 98% of the mass of an organism.

∵ Phosphorus is present in nucleic acids, ATP and phospholipids, and sulphur in the amino acids cysteine and methionine ⇒ the remaining two elements are phosphorus and sulphur.

Answer: (4)

AIPMT 2007

Keep practising — Biomolecules (Biology)

2

An organic substance bound to an enzyme and essential for its activity is called

  1. isoenzyme
  2. coenzyme
  3. holoenzyme
  4. apoenzyme
AIPMT 2006
3

The catalytic efficiency of two different enzymes can be compared by the

  1. formation of the product
  2. pH of optimum value
  3. Km value
  4. molecular size of the enzyme.
AIPMT 2005
4

Which one of the following statements regarding enzyme inhibition is correct?

  1. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein.
  2. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme.
  3. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate.
  4. Non-competitive inhibitors often bind to the enzyme irreversibly.
AIPMT 2005
5

Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

  1. help in regulating metabolism
  2. are exclusively synthesized in the body of a living organism as at present
  3. are conjugated proteins
  4. enhance oxidative metabolism.
AIPMT 2005
6

Which of the following is the simplest amino acid?

  1. Alanine
  2. Asparagine
  3. Glycine
  4. Tyrosine
AIPMT 2005
7

Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

  1. base-sugar-phosphate
  2. base-sugar-OH
  3. (base-sugar-phosphate)n
  4. sugar-phosphate
AIPMT 2005
8

Carbohydrates, the most abundant biomolecule on earth, are produced by

  1. some bacteria, algae and green plant cells
  2. fungi, algae and green plant cells
  3. all bacteria, fungi and algae
  4. viruses, fungi and bacteria.
AIPMT 2005
9

With which one of the following enzymes is copper necessarily associated as an activator?

  1. Carbonic anhydrase
  2. Tryptophanase
  3. Lactic dehydrogenase
  4. Tyrosinase
AIPMT 2004
10

The major role of minor elements inside living organisms is to act as

  1. co-factors of enzymes
  2. building blocks of important amino acids
  3. constituent of hormones
  4. binder of cell structure.
AIPMT 2003
11

In which one of the following nitrogen is not a constituent ?

  1. Pepsin
  2. Invertase
  3. Idioblast
  4. Bacteriochlorophyll
AIPMT 2003

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