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Biomolecules (Biology) · Question 72

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starch (A – E) make it useful as a storage material? The useful properties are

  1. (A), (C) and (E)
  2. (A) and (E)
  3. (B) and (C)
  4. (B) and (D)

Answer

(4) (B) and (D)

Solution

A storage material must be insoluble and chemically inert, so that it stays in the cell without disturbing its functions.

⇒ Starch is a large insoluble polysaccharide, so it is chemically non-reactive (B) and does not raise the osmotic pressure of the cell, i.e., it is osmotically inactive (D).

∵ Starch is not easily translocated (sugars are translocated as sucrose), and being digestible by animals or synthesised during photosynthesis does not make it a good storage form,

∴ the useful properties are (B) and (D).

Answer: (4)

AIPMT 2008

Keep practising — Biomolecules (Biology)

2

A competitive inhibitor of succinic dehydrogenase is

  1. -ketoglutarate
  2. malate
  3. malonate
  4. oxaloacetate
AIPMT 2008
3

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
AIPMT 2007
4

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

  1. isoenzyme
  2. coenzyme
  3. holoenzyme
  4. apoenzyme
AIPMT 2006
5

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
6

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
7

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
8

Which of the following is the simplest amino acid?

  1. Alanine
  2. Asparagine
  3. Glycine
  4. Tyrosine
AIPMT 2005
9

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
10

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
11

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

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