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Chemistry: CUET Mock Test - 6 - NEET MCQ


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40 Questions MCQ Test Chemistry Practice Tests: CUET Preparation - Chemistry: CUET Mock Test - 6

Chemistry: CUET Mock Test - 6 for NEET 2024 is part of Chemistry Practice Tests: CUET Preparation preparation. The Chemistry: CUET Mock Test - 6 questions and answers have been prepared according to the NEET exam syllabus.The Chemistry: CUET Mock Test - 6 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Chemistry: CUET Mock Test - 6 below.
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Chemistry: CUET Mock Test - 6 - Question 1

Drugs that block the binding site of an enzyme form a substrate are called ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 1

Drugs that either prevent the enzyme from holding the substrate or prevent it from providing functional groups that attack the substrate, are called enzyme inhibitors. These inhibit the catalytic activity of enzymes.

Chemistry: CUET Mock Test - 6 - Question 2

A certain compound occupied a site Y of an enzyme near to the active site. This immediately resulted in the change of shape of the active site. Y is called a/an ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 2

When a drug binds to an enzyme from a site other than the active site, it is called an allosteric site. Binding to this site causes the change in shape of active site such that the substrate cannot recognise it.

Chemistry: CUET Mock Test - 6 - Question 3

Which of the following is incorrect regarding receptors?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 3

Receptors are proteins that are embedded in the cell membrane with the binding site protruding outwards. They change the shape of the binding site to accommodate the incoming messenger and facilitate communication.

Chemistry: CUET Mock Test - 6 - Question 4

The drugs that are used when there is a lack of natural chemical messenger is called ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 4

Agonists are drugs that replicate the behaviour and properties of the chemical messenger and activate the receptor. These are used when the actual messenger is not present in the body.

Chemistry: CUET Mock Test - 6 - Question 5

 Which of the following is not a reason for the selectivity of receptors towards messengers?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 5

There are lots of different types of receptors in the body at different locations. They interact with different kinds of chemical messengers. Their selectivity for one messenger over the other is because of the difference in their binding sites, structure and composition of amino acids.

Chemistry: CUET Mock Test - 6 - Question 6

If the bond between the enzyme and inhibiting drug is very strong, which of the following takes place?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 6

When there is a strong covalent bond between the enzyme and the drug, the enzyme is blocked permanently. This results in the degradation of the entire drug-enzyme complex and the synthesis of a new enzyme.

Chemistry: CUET Mock Test - 6 - Question 7

A certain compound X occupied a site of an enzyme exactly opposite to that of the active site. This immediately resulted in the change of shape of the active site. X is called a ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 7

Non-competitive inhibitors are drugs that affect the catalytic activity of enzymes by changing the shape of the active site by binding to the enzyme at some other site. This prevents the substrate from binding to the enzyme.

Chemistry: CUET Mock Test - 6 - Question 8

Which of the following drugs will inhibit the activity of the shown enzyme?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 8

The shape of the active site resembles a triangle, which means that the substrate should also have a similar shape. The drug that will inhibit the activity of this enzyme should closely resemble the substrate and block the active site. These are called competitive inhibitors.

Chemistry: CUET Mock Test - 6 - Question 9

Which of the following hormone is a polypeptide?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 9

Insulin consists of a chain of 51 amino acids and hence is a polypeptide. Estrogen and androgen are steroids, whereas epinephrine is an amine.

Chemistry: CUET Mock Test - 6 - Question 10

Which of the following is not an amine hormone?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 10

Amine hormones are water-soluble compounds which have amino groups and are structurally derived from amino acids. Oxytocin is a peptide hormone.

Chemistry: CUET Mock Test - 6 - Question 11

Which of the following is known as fight or flight hormone?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 11

Epinephrine and norepinephrine are amine hormones that mediate response to external stimuli. Adrenaline plays an important role in fight or flight situations by increasing blood flow to muscles, blood sugar level and pulse rate.

Chemistry: CUET Mock Test - 6 - Question 12

The condition goitre is associated with which hormone?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 12

Thyroxine is an iodinated derivative of tyrosine. Abnormally low levels of thyroxine leads to hypothyroidism, which causes enlargement of thyroid gland (goitre). Increases level of thyroxine causes hyperthyroidism.

Chemistry: CUET Mock Test - 6 - Question 13

Which of the following does not release steroid hormones?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 13

Steroid hormones are produced by adrenal cortex and gonads. Hormones released by the adrenal cortex play a very important role in the functions of the bod.

Chemistry: CUET Mock Test - 6 - Question 14

Lack of which hormone causes Addison’s disease?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 14

If adrenal cortex does not function properly then one of the results may be Addison’s disease characterized by hypoglycaemia, weakness and increased susceptibility to stress. This may be fatal unless treated by glucocorticoids and mineralocorticoids.

Chemistry: CUET Mock Test - 6 - Question 15

Hormones are ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 15

Hormones are chemical substances produced by the endocrine glands in the human body. They are carried to different parts of the body through the blood stream. Because of the action of hormones as intercellular communicators, they are called chemical messengers.

Chemistry: CUET Mock Test - 6 - Question 16

Identify the hormone that increases the glucose level in blood.

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 16

Insulin is released in response to the rapid rise in blood glucose level. On the other hand, the hormone glucagon tends to increase the glucose level in blood. These two hormones together regulate the blood glucose level.

Chemistry: CUET Mock Test - 6 - Question 17

Which hormone plays an important role during child birth and post it?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 17

Oxytocin controls the contraction of the uterus during child birth and helps in the release of milk from mammary glands. Progesterone is responsible for the preparation of uterus for implantation of fertilised egg.

Chemistry: CUET Mock Test - 6 - Question 18

Lack of which component in diet causes hypothyroidism?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 18

Low levels of iodine in the diet may lead to hypothyroidism and enlargement of the thyroid gland. This can be controlled by adding sodium iodide to table salt to form iodised salt.

Chemistry: CUET Mock Test - 6 - Question 19

Which hormone controls the balance of water and minerals in the body?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 19

Mineralocorticoids are steroid hormones which control the level of excretion of water and salt by the kidney, thus balancing the water and mineral levels as required.

Chemistry: CUET Mock Test - 6 - Question 20

Which of the following best describes a particular enzyme?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 20

Enzymes are biological catalysts produced by living cells. They differ from other catalysts in being highly selective and specific. Almost all enzymes are globular proteins. They are very specific for a particular reaction and a particular substrate.

Chemistry: CUET Mock Test - 6 - Question 21

The enzyme which catalyses the conversion of proteins to amino acids is ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 21

Proteases are enzymes that helps in protein catabolism by hydrolysis of peptide bonds. Pepsin and trypsin are the most common proteases, found in the human stomach and pancreas respectively. Both of them are major digestive enzymes.

Chemistry: CUET Mock Test - 6 - Question 22

Enzymes are regarded as ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 22

Enzymes are biological catalysts produced by living cells which catalyse the biochemical reactions in living organisms. Chemically, enzymes are naturally occurring simple or conjugate proteins.

Chemistry: CUET Mock Test - 6 - Question 23

Cellulose is not digestible by humans due to the absence of which of the following enzymes?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 23

The enzyme cellulase hydrolyses cellulose into glucose and thereby digests it. However, the human stomach does not produce any enzyme capable of digesting cellulose, and hence it cannot be digested.

Chemistry: CUET Mock Test - 6 - Question 24

Albinism is caused by the deficiency of which enzyme?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 24

Deficiency of tyrosinase results in insufficient production of melanin. This causes a condition of white skin and hair called albinism. It can be prevented by including the required supply of enzyme through diet.

Chemistry: CUET Mock Test - 6 - Question 25

Identify the correct statement about enzymes.

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 25

Enzymes decrease the activation energy of a reaction. Extremely small quantities of enzymes can increase the rate of reaction by thousands. Enzyme action can be inhibited by compounds known as enzyme inhibitors.

Chemistry: CUET Mock Test - 6 - Question 26

The prosthetic groups which get attached to the enzyme at the time of reaction are called _____

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 26

Most active enzymes are associated with some non-protein components required for their activity. These are called prosthetic groups and they may be cofactors or coenzymes.

Chemistry: CUET Mock Test - 6 - Question 27

Enzymes are basically ______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 27

Almost all enzymes are globular proteins, which are nothing but very long chains of amino acids residues (>100) and higher molecular mass, or polypeptides.

Chemistry: CUET Mock Test - 6 - Question 28

Which of the following is a substrate specific enzyme?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 28

Substrate specific enzymes are those which can act only on one particular compound to give a product(s). For example, maltase acts only on maltose to break the glycosidic linkage between the two glucose units.

Chemistry: CUET Mock Test - 6 - Question 29

Enzymes are generally named after the ________

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 29

Enzymes are generally name after the compound or class of compounds on which they work. For example, the catalyst that hydrolyses the reaction of starch (amylum) to glucose is called as amylase.

Chemistry: CUET Mock Test - 6 - Question 30

Diethylamine reacts with nitrous acid in the cold to form _______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 30

Secondary amines react slowly with nitrous acid at low temperatures to give yellow oily nitrosoamines. Diethylamine specifically produces N,N-diethylnitrosoamine.

Chemistry: CUET Mock Test - 6 - Question 31

Which of the following amines, on reaction with benzenesulphonyl chloride, will give a sulphonamide that is insoluble in alkali?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 31

Secondary amines on reaction with Hinsberg’s reagent produce sulphonamides without any hydrogen atom attached to the nitrogen atom. Hence, it is not acidic and therefore insoluble in alkali. The amide produced in this case is N-ethyl-N-methylbenzenesulphonamide.

Chemistry: CUET Mock Test - 6 - Question 32

Which of the following reactions/tests does not help in the distinction between ethylamine and diethylamine?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 32

Both ethylamine and diethylamine on reaction with CH3CH2Br eventually gives quaternary ammonium salt. Hence, the alkylation of primary amines cannot be used as a distinction method.

Chemistry: CUET Mock Test - 6 - Question 33

The activating effect of -NHCOCH3 group is ______ as compared to -NH2 group.

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 33

The -NHCOCH3 group forms two resonance structures, where the lone pair of nitrogen interacts with the lone pairs on oxygen atom. This makes the lone electron pair on N less available for donation to benzene ring.

Chemistry: CUET Mock Test - 6 - Question 34

What is the order of quantities of all isomers of nitroaniline formed on the reaction of aniline with nitric acid and sulphuric acid at 288K?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 34

Nitration of aniline produces nitro derivatives. Under controlled conditions, aniline is protonated (by strong acidic medium) to form anilinium ion, which is meta directing. Therefore, apart from p-nitroaniline (51%) and o-nitroaniline (2%), a significant amount of m-nitroaniline (47%) is also formed.

Chemistry: CUET Mock Test - 6 - Question 35

A compound ‘P’ on treating with concentrated H2SO4 forms ‘R’. The product ‘R’ on heating at 460K forms a zwitter ionic compound. Identify P, R respectively.

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 35

Aniline (P) reacts with conc. H2SO4 to form anilinium hydrogensulphate (R) which on heating at 453-473K produces sulphanilic acid (zwitter ionic compound).

Chemistry: CUET Mock Test - 6 - Question 36

What is the major product formed when aniline reacts with bromine water at room temperature?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 36

Since amino group is highly ortho and para directing, it substitutes the Br group at the para as well as both ortho positions (2,4,6) to give a white precipitate of a tribromo substituted aniline.

Chemistry: CUET Mock Test - 6 - Question 37

Aniline is a _______ directing compound.

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 37

The ortho and para positions with respect to NH2 group in aniline are centres of high electron density. This is due to the resonance structures of aniline. Thus, NH2 is ortho and para directing and a powerful activating group.

Chemistry: CUET Mock Test - 6 - Question 38

Which of the following amines will form a product that is soluble in KOH, on reaction with Hinsberg’s reagent?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 38

The reaction of Hinsberg’s reagent with Isopropylamine gives N-isopropylbenzene sulphonamide. The lone hydrogen attached to the N atom is strongly acidic due to the presence of strong electron withdrawing sulphonyl group. Hence, is it soluble in alkali like KOH.

Chemistry: CUET Mock Test - 6 - Question 39

Hinsberg’s reagent is _______

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 39

Benzenesulphonyl chloride (C6H5SO2Cl), or arylsulphonyl chloride, is known as Hinsberg’s reagent. It is an important compound used in the distinction of different classes of amines.

Chemistry: CUET Mock Test - 6 - Question 40

Which of the following is not a final product of the reaction between propylamine and nitrous acid?

Detailed Solution for Chemistry: CUET Mock Test - 6 - Question 40

CH3CH2CH2N2Cl is a diazonium salt derivative of propanamine and is first formed when it reacts with HNO2. This is a very unstable compound and immediately decomposes to give propanol and evolves nitrogen gas.

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