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Biomolecules (Biology) · Question 80

AIPMT 2005MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(1) base-sugar-phosphate

Solution

As per NCERT, a nitrogenous base attached to a sugar is called a nucleoside, and if a phosphate group is also esterified to the sugar the compound is called a nucleotide.

⇒ Nucleotide = base + sugar + phosphate.

⇒ (base-sugar-phosphate)n is a polynucleotide (nucleic acid), and base-sugar is a nucleoside.

Answer: (1)

AIPMT 2005

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2

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
3

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
4

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
5

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

  1. Pepsin
  2. Invertase
  3. Idioblast
  4. Bacteriochlorophyll
AIPMT 2003
6

Lipids are insoluble in water because lipid molecules are

  1. hydrophilic
  2. hydrophobic
  3. neutral
  4. zwitterions.
AIPMT 2002
7

Which of the following is a reducing sugar?

  1. Galactose
  2. Gluconic acid
  3. -methyl galactoside
  4. Sucrose
AIPMT 2002
8

Collagen is:

  1. Globular protein
  2. Fibrous protein
  3. Carbohydrate
  4. Lipid
AIPMT 2002
9

Most abundant organic compound on earth is

  1. Cellulose
  2. Steroids
  3. Protein
  4. Lipids
AIPMT 2001
10

Spoilage of oil can be detected by which fatty acid?

  1. Linolenic acid
  2. Erucic acid
  3. Linoleic acid
  4. Oleic acid
AIPMT 2001
11

In plants, inulin and pectin are

  1. Excretory material
  2. Reserve material
  3. Insect attracting material
  4. Wastes
AIPMT 2001

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