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Biomolecules (Biology) · Question 56

NEET 2013MCQMedium📈 Topic in 38% papers+4−1
1

A phosphoglyceride is always made up of

  1. a saturated or unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached.
  2. a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.
  3. only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
  4. only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.

Answer

(1) a saturated or unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached.

Solution

As per NCERT, fatty acids may be saturated (without double bond) or unsaturated (with one or more C=C double bonds), and they are found esterified with glycerol; some lipids have phosphorus and a phosphorylated organic compound in them — phospholipids (e.g. lecithin).

⇒ In a phosphoglyceride, fatty acids (saturated or unsaturated) are esterified to the –OH groups of glycerol, and a phosphate group is attached to the third carbon of the same glycerol.

∵ The fatty acid is linked to glycerol (not to the phosphate), and it need not be only saturated or only unsaturated,

∴ option (1) is correct.

Answer: (1)

NEET 2013

Keep practising — Biomolecules (Biology)

2

Macromolecule chitin is

  1. sulphur containing polysaccharide
  2. simple polysaccharide
  3. nitrogen containing polysaccharide
  4. phosphorus containing polysaccharide.
NEET 2013
3

Transition state structure of the substrate formed during an enzymatic reaction is

  1. transient and unstable
  2. permanent and stable
  3. transient but stable
  4. permanent but unstable.
NEET 2013
4

The essential chemical components of many coenzymes are

  1. carbohydrates
  2. vitamins
  3. proteins
  4. nucleic acids.
NEET 2013
5

Which of the following statements about enzymes is wrong?

  1. Enzymes are denaturated at high temperatures.
  2. Enzymes are mostly proteins but some are lipids also.
  3. Enzymes are highly specific.
  4. Enzymes require optimum pH and temperature for maximum activity.
NEET 2013 (Karnataka)
6

Uridine, present only in RNA is a

  1. nucleoside
  2. nucleotide
  3. purine
  4. pyrimidine.
NEET 2013 (Karnataka)
7

The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A - D. Which one of the following options is correct? [figure]

  1. D is an acidic amino acid-glutamic acid.
  2. C is an aromatic amino acid-tryptophan.
  3. A is the C-terminal amino acid and D is N-terminal amino acid.
  4. A is a sulphur containing amino acid methionine.
NEET 2013 (Karnataka)
8

Which one of the following biomolecules is correctly characterized?

  1. Lecithin – a phosphorylated glyceride found in cell membrane.
  2. Palmitic acid – an unsaturated fatty acid with 18 carbon atoms.
  3. Adenylic acid – adenosine with a glucose phosphate molecule.
  4. Alanine amino acid – contains an amino group and an acidic group anywhere in the molecule.
AIPMT 2012 (Mains)
9

For its activity, carboxypeptidase requires

  1. Zinc
  2. iron
  3. niacin
  4. copper
Out of syllabusAIPMT 2012 (Mains)
10

Which one out of A - D given below correctly represents the structural formula of the basic amino acid? [figure]

  1. C
  2. D
  3. A
  4. B
AIPMT 2012 (Prelims)
11

Which one is the most abundant protein in the animal world?

  1. Trypsin
  2. Haemoglobin
  3. Collagen
  4. Insulin
AIPMT 2012 (Prelims)

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