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31 Years NEET Previous Year Questions: Biomolecules - 1


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15 Questions MCQ Test Biology 31 Years NEET Chapterwise Solved Papers | 31 Years NEET Previous Year Questions: Biomolecules - 1

31 Years NEET Previous Year Questions: Biomolecules - 1 for NEET 2022 is part of Biology 31 Years NEET Chapterwise Solved Papers preparation. The 31 Years NEET Previous Year Questions: Biomolecules - 1 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Biomolecules - 1 MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Biomolecules - 1 below.
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31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 1

Which of the following are not secondary metabolites in plants? [2021]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 1
  • When one analyses plant, fungal and microbial cells, one would see thousands of compounds other than these called primary metabolites, e.g. alkaloids, flavonoids, rubber, essential oils, antibiotics, coloured pigments, scents, gums, spices. These are called secondary metabolites.
  • Amino acids and Glucose are primary metabolites but not secondary metabolites as they have some known functions.
31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 2

Identify the basic amino acid from the following     [2020]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 2

Lysine is the basic amino acid. Valine is a neutral amino acid. Tyrosine is an aromatic amino acid. Glutamic acid is an acidic amino acid.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 3

Which of the following glucose transporters is insulin-dependent?    [2019]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 3

GLUT stands for glucose transport protein channel. They are of different types. Glucose transporter type 4 (GLUT IV) is a protein encoded in humans by the SLC2A4 gene. It is an insulin-regulated glucose transporter found primarily in adipose tissues and striated muscles.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 4

The two functional groups characteristic of sugars are    [2018]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 4

Carbohydrates (commonly called sugars) are chemically defined as polyhydroxy aldehyde or ketones. All sugar molecules have one carbonyl group (-CO-) in addition to the hydroxyl group (OH) on other carbon atoms.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 5

A typical fat molecule is made up of [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 5

A typical fat molecule has one glycerol and three fatty acid molecules.

Structure of a typical fat molecule:

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 6

Which one of the following statements is WRONG? [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 6

Glycine (abbreviated as Gly or G) is the smallest of the 20 amino acids commonly found in proteins. The formula is NH2CH2COOH.
Its codons are GGU, GGC, GGA, GGG of the genetic code. 

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 7

The amino acid Tryptophan is the precursor for the synthesis of [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 7

Option A: Tryptophan is a precursor to neurotransmitters serotonin and melatonin.

Option B: Thyroxine (3,5,3',5'-tetraiodothyronine) is produced by follicular cells of the thyroid gland. It is produced as the precursor of thyroglobulin.

Option C: Estrogen is biosynthesized from progesterone (arrived at in two steps from cholesterol, via intermediate pregnenolone).

Option D: Cortisone is one of several end-products of a process called steroidogenesis. Cortisol is produced in the adrenal cortex of kidney. 

Hence, Option A is correct.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 8

Enzymes increase the rate of reaction by______.

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 8

Enzymes increase the rate of reaction by decreasing the activation energy.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 9

 The two polypeptides of human insulin are linked together by         [2016]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 9
  • Insulin is a hormone consisting of 2 polypeptide chains. Each chain is composed of a specific sequence of amino acid residues connected by peptide bonds.
  • In humans, chain A has 21 amino acids, and chain B has 30. Post-translational modifications result in the connection of these two chains by disulfide bridges

Structure of Insulin:

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 10

Which one of the following statements is INCORRECT?         [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 10

Km increases but Vmax remains the same in competitive inhibition.
This is because, on slightly increasing the substrate concentration, the effect of the inhibitor is removed. 

Enzyme inhibition (competitive, non-competitive and uncompetitive) –  Medicoapps

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 11

Which of the following biomolecules does have a phosphodiester bond ? [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 11

DNA and RNA are the chain of polynucleotide which are joined by the phosphodiester bonds. The two nucleotide is linked by the phosphodiester bond. It is formed by the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 12

The enzyme that is NOT present in succus entericus is :          [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 12

Succus entericus is the clear to pale yellow watery secretions from the glands lining the small intestine walls. It contains hormones, digestive enzymes, mucus, and bicarbonate. It doesn't contain a nuclease enzyme.

A nuclease is an enzyme capable of cleaving the phosphodiester bonds between the nucleotide subunits of nucleic acids.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 13

The introduction of t-DNA into plants involves:               [2015 RS]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 13
  • Agrobacterium tumefaciens is a plant pathogenic bacterium that carries Ti plasmid.
  • It can transfer a particular segment of the tumor-inducing (Ti) plasmid into the nucleus of infected cells.
  • The transferred T-DNA is then integrated into the host genome and transcribed with it.
  • This ability of Agrobacterium tumefaciens to transfer the T-DNA in the host genome is explored in genetic engineering to transfer the desired DNA segment, carrying the gene of interest, into the genome of selected organisms. 

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 14

Select the option which is NOT correct with respect to enzyme action:          [2014]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 14

Inhibitions of succinic dehydrogenase by malonate is an example of competitive inhibition. Thus it is a reversible reaction.
On increasing the substrate (succinate) concentration the effect of inhibitor is removed and Vmax remains the same. 

Hence option B is correct.

31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 15

Which one of the following is a non - reducing carbohydrate?          [2014]

Detailed Solution for 31 Years NEET Previous Year Questions: Biomolecules - 1 - Question 15

Sucrose is classified under non reducing sugars because it does not have any free aldehyde or keto group. 

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