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Test: Proteins Enzymes & Vitamins


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20 Questions MCQ Test Chemistry for JEE | Test: Proteins Enzymes & Vitamins

Test: Proteins Enzymes & Vitamins for NEET 2022 is part of Chemistry for JEE preparation. The Test: Proteins Enzymes & Vitamins questions and answers have been prepared according to the NEET exam syllabus.The Test: Proteins Enzymes & Vitamins MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Proteins Enzymes & Vitamins below.
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Test: Proteins Enzymes & Vitamins - Question 1

Which of the following is a test for proteins?

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 1

Biuret solution is used to identify the presence of protein. Biuret reagent is a blue solution that, when it reacts with protein, will change color to pink-purple.

Test: Proteins Enzymes & Vitamins - Question 2

In which structure of protein, the polypeptide chain forms all possible hydrogen bonds by twisting into right handed screw?

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 2

The correct answer is option D
α helix is one of the most common ways in which a polypeptide chain forms all possible hydrogen bonds (intermolecular and intramolecular hydrogen bond) by twisting into a right-handed screw(helix) with the N−H group of each amino acid residue hydrogen bonded to C=O of an adjacent turn of the helix.
 

Test: Proteins Enzymes & Vitamins - Question 3

Haemoglobin is an example of:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 3

The correct answer is A
Haemoglobin is a Quaternary protein because it has 4 polypeptide structures - 2alpha and 2 beta.

Test: Proteins Enzymes & Vitamins - Question 4

The amino acid which is not optically active is:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 4

Glycine is the simplest amino acid and is the only amino acid that is not optically active (it has no stereoisomers).

Test: Proteins Enzymes & Vitamins - Question 5

Which one of the following is a water soluble vitamin?

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 5

The correct answer is Option C
Fat soluble vitamin - A, D, E, K
Water soluble vitamin - Vitamin B complex and C
So, vitamin B is water soluble.
Vitamins which can dissolve in water are called water-soluble vitamins. Water-soluble vitamins include vitamin-C and vitamin-B because they remove the toxins from our body through urine. Therefore, they are not stored in our body and should be taken on a daily basis through the food we eat.

Test: Proteins Enzymes & Vitamins - Question 6

The amino acid which are synthesized in the body are known as:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 6

Nonessential amino acids can be synthesized in the body, whereas essential amino acids must be obtained in the diet. Cells in the body can provide the carbon skeleton of the nonessential amino acids.

Test: Proteins Enzymes & Vitamins - Question 7

The enzyme pepsin hydrolyses:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 7

The correct answer is Option C
Pepsin hydrolyses proteins to amino acid(polypeptide chains) and initiates protein digestion in the digestion process in humans.

Test: Proteins Enzymes & Vitamins - Question 8

Which of the following statements is correct about Enzymes?

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 8

The correct answer is option A
 
Higher temperatures  speed up the effect of enzyme activity, while lower temperatures decrease the rate of an enzyme reaction. if the temperature is too high, an enzyme will denature, which causes the shape of the enzyme to change. If the enzyme's shape changes, it cannot bind to the substrate.

Test: Proteins Enzymes & Vitamins - Question 9

Certain organic compounds are required in small amount in our diet but their deficiency causes diseases. The compounds are called:

Test: Proteins Enzymes & Vitamins - Question 10

When more than ten amino acids react, then the product formed is called:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 10

Small polymers of amino acids (fewer than 50) are called oligopeptides, while larger ones (more than 50) are referred to as polypeptides. Hence, a protein molecule is a polypeptide chain composed of many amino acid residues, with each residue joined to the next by a peptide bond.

Test: Proteins Enzymes & Vitamins - Question 11

Enzymes belong to the class of compounds called:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 11

Enzymes are proteins that act as catalysts and help complex reactions occur everywhere in life. These are polypeptides. Chemically, peptide linkage is an amide formed between –COOH group and –NH2 group.

Test: Proteins Enzymes & Vitamins - Question 12

In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 12

The correct answer is Option D
In aqueous solution, the carboxyl group can lose proton and the amino group can accept proton, giving rise to a dipolar ion known as zwitterion. In zwitter ionic form, amino acids show amphoteric behaviour as they react both with acids and bases.

Test: Proteins Enzymes & Vitamins - Question 13

The symptoms of retinol excess are

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 13

The correct answer is option B
Fibrous Protein
When polypeptide chains run parallel & are held together by hydrogen and disulphide bonds, then ber, rod or wire-like structure is formed. They are shaped like fibers; hence called Fibrous protein These proteins are water-insoluble.
 

Test: Proteins Enzymes & Vitamins - Question 14

Amino acid are connected to each other by:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 14

Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.

Test: Proteins Enzymes & Vitamins - Question 15

The active form of vitamin D is:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 15

The correct answer is option B
Calcitriol , is the hormonally active metabolite of vitamin D  which has three hydroxyl groups.Calcitriol increases the level of calcium  (Ca2+) in the blood  by increasing the uptake of calcium from the gut  into the blood, increasing reabsorption of calcium by the kidneys, and possibly increasing the release of calcium into the blood from bone. Vitamin D has a significant role in calcium homeostasis  and metabolism. Its discovery was due to effort to find the dietary substance lacking in children with rickets  (the childhood form of osteomalacia).

Test: Proteins Enzymes & Vitamins - Question 16

Which of the following compounds is a recipient of the one carbon fragments that tetra hydro folate receives and transfers?

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 16

Formaldehyde  is a recipient of the one carbon fragments that tetra hydro folate receives and transfers 

Test: Proteins Enzymes & Vitamins - Question 17

On hydrolysis, proteins give:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 17

The correct answer is option  B
Ultimate product of hydrolysis of protein is amino acid. Proteins are polymers made up of several amino acids. These amino acids are linked through peptide bonds. On hydrolysis, peptide bonds are broken and amino acids are released.

Test: Proteins Enzymes & Vitamins - Question 18

Deficiency of which vitamin causes scurvy?​

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 18

Many people with scurvy, a disease caused by vitamin C deficiency, eventually die of infection due to their poorly functioning immune systems.

Test: Proteins Enzymes & Vitamins - Question 19

When a protein is subjected to physical changes the protein loses its biological activity. This is known as:

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 19

The correct answer is Option D
This loss of biological activity by the protein is called denaturation. During denaturation, the secondary and the tertiary structures of the protein get destroyed, but the primary structure remains unaltered. One of the examples of denaturation of proteins is the coagulation of egg white when an egg is boiled.

Test: Proteins Enzymes & Vitamins - Question 20

_________ are biocatalysts which speed up the reactions in biosystems.

Detailed Solution for Test: Proteins Enzymes & Vitamins - Question 20

The correct answer is Option A
Biocatalysis refers to the use of living (biological) systems or their parts to speed up (catalyze) chemical reactions. In biocatalytic processes, natural catalysts, such as enzymes, perform chemical transformations on organic compounds.

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