Live Class 12:00 05:00 PM - NEET BOOSTER€¦ · [] Contact. : 8400-582-582, 8604-582-582 Arrange the steps of catalytic cycle of an enzyme in order and choose the right option

Dr. Hariom GangwarMBBS (KGMU)

8+ yrs Teaching Experience

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PM

05:00

PM

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Dr. Hariom GangwarM.B.B.S (KGMU)

8+ Yrs Teaching Experience

1,00,000 Student Mentored

Chapterwise

Questions

Biology

[www.gangwarinstitute.com]

Contact. : 8400-582-582, 8604-582-582

The following figure shows the

(A) Action spectrum of photosynthesis

superimposed on absorption

spectrum of chlorphyll a

(B) Action spectrum of photosynthesis

superimposed on absorption

spectrum of chlorophyll b

(C) Both A & B

(D) Absorption spectrum of carotenoids

superimposed on action spectrum of

photosynthesis

01


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Which is incorrect about coenzyme

(A) Every coenzyme is a cofactor but every cofactor is

not a coenzyme

(B) Every enzyme is a cofactor and every cofactor is a

coenzyme

(C) Most of the coenzymes are nucleotides and are

composed of vitamins

(D) Coenzymes are the active constituents of enzymes.

02


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The amino acid Tryptophan is the precursor for the

synthesis of

(A) Melatonin and Serotonin

(B) Thyroxine and Triodothyronine

(C) Estrogen and Progesterone

(D) Cortisol and Cortisone.

03


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04

Given below is a highly simplified representation of the

human sex chromosomes from a karyotype.

The genes a and b could be of

(A) Haemophilia & red-green colour blindness

(B) Attached ear lobe and Rhesus blood group

(C) Colour blindness and body height

(D) Phenylketonuria and haemophilia.


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A sigmoid or S - curve is a characterstic of

(A) Living organism growing in a natural environment

(B) Typically all cells, tissues and organs of a plant

(C) Root elongation at a constant rate

(D) Both A and B.

05


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Enzyme catalysts differ from inorganic catalysts as

(A) Inorganic catalysts work efficiently at high

temperatures and high pressures, while enzymes get

damaged at high temperatures (above 400C)

(B) Enzyme increases the activation energy while organic

catalyst decreases

(C) Enzymes are used up in a reaction while inorganic

catalyst remain unchanged

(D) All of the above.

06


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Given below is a simplified model of

phosphorus cycling in a terrestrial

ecosystem with four blanks (a-d).

Identify the blanks

(A) a-Detritus, b-Rock minerals, c-

Producers, d-Litter fall

(B) a-Rock minerals, b-Detritus, c-

Litter fall, d-Producers

(C) a-Litter fall, b-Producers, c-

Rock minerals, d-Detritus

(D) a-Producers, b-Litter fall, c-

Rock minerals, d-Detritus.

07

Consumers

a

Soil solution

b

c

Decomposition

Uptake

Run off

Weathering

d


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Arrange the steps of catalytic cycle of an enzyme in order and

choose the right option

(i) Enzyme releases products of reaction and the enzyme is free

to bind to another substrate

(ii) Active site of enzyme is in close proximity of substrate and

breaks the chemical bonds of substrate

(iii) Binding of substrate induces enzymes to alter its shape fitting

more tightly around substrate

(iv) Substrate bind to active site of enzyme fitting into active site

(A) iii, iv, i, ii (B) iv, ii, i, iii

(C) iv, iii, ii, i (D) iii, ii, i, iv

08


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In the graphical representation of pulmonary volumes and

capacities, 'x' denotes

(A) Inspiratory reserve volume

(B) Inspiratory capacity

(C) Expiratory capacity

(D) Total lung capacity.

09

Tidal volume

Expiratoryreservevolume

Vital

capacity

‘ ’x


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Which one of the following statements is incorrect

(A) The competitive inhibitor does not affect the rate of

breakdown of the enzyme-substrate complex

(B) The presence of the competitive inhibitor decreases

the Km of the enzyme for the substrate

(C) A competitive inhibitor reacts reversibly with the

enzyme to form an enzyme-inhibitor complex

(D) In competitive inhibition, the inhibitor molecule is

not chemically changed by the enzyme.

10


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Given here is an ECG of a normal human. Which one of its

components is correctly interpreted

(A) QRS comples - one complete pulse

(B) Peak T - initiation of total cardiac contraction

(C) Peaks P and R - systole and diastole blood pressure

(D) Peak T - initiation of left atrial contraction only.

11


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Human population shows

(A) J-shaped growth curve

(B) Z-shaped growth curve

(C) S-shaped growth curve

(D) All of the above.

12


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After exponential increase, population becomes stagnant.

The growth curve is

(A) J-Shaped

(B) S-Shaped

(C) Fluctuating

(D) Circular.

13


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The following graph depicts changes in twopopulations (A and B) of herbivores in a grassyfield. A possible reason for these changes isthat(A) Population A produced more offspring

than population B(B) Population B competed more successfully

for food than population A(C) Both plant populations in this habitat

decreased(D) Population A consumed the members of

population B.

14

A

B

Num

ber

of

Org

anis

ms

Time


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One molecule of an enzyme is able to catalyse conversion of

two molecules of substrate into products in 5 minutes. Ten

molecules of enzyme and 25 molecules of substrate are mixed

in a test tube. At the end of 10 minutes the test tube will have

(A) Products and enzymes molecules

(B) Products only

(C) Products, enzyme molecules and 5 molecules of

substrate

(D) Products and 5 unreacted substrate molecules.

15


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Volume of air remaining in lungs after maximum

respiratory effort is

(A) Vital capacity

(B) Residual volume

(C) Total lung capacity

(D) Tidal volume.

16


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The following graph showing the

(A) Absorption spectrum of chlorophyll b

(B) Absorption spectrum of chlorophyll a

(C) Action spectrum of photosynthesis

(D) Both A & B.

17


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Formation of whole body from a fragment is

(A) Epigenesis

(B) Epimorphosis

(C) Morphallaxis

(D) Auxetic growth.

18


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Which of the following is/are a physical process

(A) Change in shape without breaking of bonds

(B) Change in state of matter (when ice melts into

water, or when water becomes a vapour)

(C) Hydrolysis of starch into glucose

(D) Both A and B.

19


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Recognise the figure and find out the correct matching

according to the pyramid of biomass in an aquatic

ecosystem

(A) a-11, b-4

(B) a-21, b-4

(C) a-11, b-1.5

(D) a-12, b-4.

20

PC

PP b

a


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Which statement regarding enzyme inhibition is correct

(A) Competitive inhibition occurs when the substrate and

the inhibitor compete for active site on the enzyme

(B) Competitive inhibition occurs when a substrate

competes with enzyme for binding to inhibitor protein

(C) Non – competitive inhibition of an enzyme can be

overcome by adding large amount of substrate.

(D) Non – competitive inhibitors often bind to the enzyme

irreversibly.

21


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Select the option which is not correct with respect to enzyme

action

(A) Malonate is a competitive inhibitor of succinic

dehydrogenase

(B) Substrate binds with enzyme at its active site

(C) Addition of lot of succinate does not reverse the

inhibition of succinic dehydrogenase by malonate

(D) A non - competitive inhibitor binds the enzyme at a site

distinct from that which binds the substrate

22

Recognise the figure and find out

the correct labelling

(A) a and c - arithmetic, b and d -

geometric

(B) a and c - geometric, b and d -

arithmetric

(C) a and d - geometric, b and c -

arithmetric

(D) a and d - arithmetic, b and c -

geometric.

23

Cells capable

of division

Cells that lose

capacity to divide


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Number of immigration is more than emigration and

death is lower than natality. Growth curve of population

will show

(A) Exponential phase

(B) Lag phase

(C) Declining phase

(D) Steady phase.

24


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An example of competitive inhibition of an enzyme is the

inhibition of

(A) Cytochrome oxidase by cyanide

(B) Succinic dehydrogenase by malonic acid

(C) Hexokinase by glucose 6-phosphate

(D) Carbonic anhydrase by carbon dioxide.

25

Recognise the figure and find

out the correct matching

(A) d-LH, c-FSH, b-

estrogen, a-progesteron

(B) b-LH, a-FSH, c-

estrogen, d-progesteron

(C) c-LH, d-FSH, a-

estrogen, b-progesteron

(D) a-LH, b-FSH, c-

estrogen, d-progesteron.

26b a

Developing follicle Mature follicle

Developing

corpus luteum

Regressingcorpus luteum

Ovulation

c

d

MensesO

vuri

an

even

tsU

teri

ne e

ven

ts

Days1 3 5 7 9 11 13 15 17 19 21 23 25 27 29/1

Menstruation Follicular phase(Proliferative phase)

Luteal phase(Secretory phase)

Next cyclebegins


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A population has more young individuals compared to

the older individuals. What would be the status of the

population after some years

(A) It will decline

(B) It will stabilise

(C) It will increase

(D) It will first decline and then stabilise.

27


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Normal breathing rate of a healthy human is

(A) 12-16 times/minute

(B) 15-20 times/minute

(C) 70–75 times/minute

(D) 10-12 times/minute.

28


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The figure given below is a diagrammatic

representation of response of organisms to

abiotic factors. What do (a), (b), (c)

represent respectively

(A) a-Partial regulator, b-Regulator,

c-Conformer

(B) a-Regulator, b-Conformer, c-Partial

regulator

(C) a-Regulator, b-Partial regulator,

c-Conformer

(D) a-Conformer, b-Regulator, c-Partial

regulator.

29

External level

c

a

Inte

rnal

level

b


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By using the carbonic anhydrase enzyme the reaction

(CO2 + H2O H2CO3) speeds dramatically with about

(A) 6,00,000 molecules being formed every hour

(B) 6,00,000 molecules being formed every second

(C) 36 million molecules being formed every minute

(D) Both B and C.

30


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Transition state structure of the substrate formed during

an enzymatic reaction is

(A) Transient and unstable

(B) Permanent and stable

(C) Transient but stable

(D) Permanent but unstable.

31


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Recognise the figure and find out the correct matching

a. At which point in the curve light is a limiting factor?

b. What do 'C' represent on the curve?

c. What do 'D' represent on the curve?

d. What do 'E' represent on the curve?

(A) a-A, b-factors other than light become limiting, c-light

saturation point, d-maximum rate of photosynthesis

(B) a-B, b-maximum rate of photosynthesis, c-light saturation

point, d-factors other than light become limiting

(C) a-A, b-light saturation point, c-maximum rate of

photosynthesis, d-factors other than light become limiting

(D) a-A, b-factors other than light become limiting, c-

maximum rate of photosynthesis, d-light saturation point.

32

E

A

B C

DLight intensity

Rate

of

photo

syn

thesis


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Typical growth curve in plants is

(A) Stair-steps shaped

(B) Sigmoid

(C) Parabolic

(D) Linear.

33


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Growth through increase in volume is

(A) Cartilage

(B) Striated muscle

(C) Nerve fibre

(D) Lens of eye.

34


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35

The graph below shows the changes in

two populations of herbivores in a grassy

field. A possible reason for these changes is that

(A) All of the plant populations in this habitat decreased

(B) Population A consumed the members of population B

(C) Population A produced more offspring than population B

did

(D) Population B competed more successfully for food than

population A did.


Contact. : 8400-582-582, 8604-582-582

Three of the following statements about enzymes are

correct and one is wrong. Which one is wrong

(A) Enzymes are denatured at high temperature but in

certain exceptional organisms they are effective

even at 800 -900C

(B) Most enzymes are proteins but some are lipids

(C) Enzymes require optimum pH for maximal activity

(D) Enzymes are highly specific.

36


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Maximum growth rate occurs in

(A) Stationary phase

(B) Lag phase

(C) Exponential phase

(D) Senescent phase.

37


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Recognise the figure and find out the

correct matching

(A) y-chlorophyll a, x-chlorophyll b,

z-carotenoids

(B) z-chlorophyll a, y-chlorophyll b,

x-carotenoids

(C) y-chlorophyll a, z-chlorophyll b,

x-carotenoids

(D) z-chlorophyll a, x-chlorophyll b,

y-carotenoids

38

z


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Fill in the blanks

Quantitative comparisons between the growth of the living system

can be made in two ways:

(i) Measurement and the comparison of total growth per unit

time is called the ....a.... growth rate.

(ii) The growth of the given system per unit time expressed on a

common basis, eg.; per unit initial parameter is called ....b....

growth rate.

(A) a- arithmetic, b- geometric (B) a- relative, b- absolute

(C) a- absolute, b- relative (D) a- geometric, b- arithmetic

39


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Match the columns I & II, and choose the correct combination

from the options given

Column I Column II

1. Stable

2. Expanding

a. b. c. 3. Declining

(A) a-1, b-2, c-3 (B) a-1, b-3, c-2

(C) a-2, b-3, c-1 (D) a-3, b-1, c-2.

40


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Proportion of young individuals is highest in case of

(A) Declining population

(B) Stable population

(C) Both A and B

(D) Expanding population.

41


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In absence of any enzyme this reaction is very slow, with

about

(A) 6,00,000 molecules of H2CO3 formed in one second

(B) 200 molecules of H2CO3 being formed in one second

(C) 200 molecules of H2CO3 being formed in one

minute

(D) 200 molecules of H2CO3 being formed in one hour.

42


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43

The curve given here shows enzymatic activity with relation to

three conditions (pH, temperature & substrate concentration),

What do the two axes, x and y represent

X- axis Y-axis

(A) Temperature Enzyme activity

(B) Enzymatic activity Temperature

(C) Enzyme activity pH

(D) Substrate concentration Enzyme activity


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Exponential growth is expressed as

(A) W1 = W0 ert

(B) L0= Lert

(C) Lt=L0 + rt

(D) W0 = W1 ert .

44


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Sigmoid curve is

(A) Rate of transpiration

(B) Rate of respiration

(C) Rate of photosynthesis

(D) Growth of population.

45


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46

The figure given shows the conversion of substrate into product by an

enzyme. In which one of the four options, A—D, the components of the

reaction labelled a, b, c, d are identified correctly

1. Potential energy

2. Transition state

3. Activation energy with enzyme

4. Activation energy without enzyme

(A) a-2, b-1, c-3, d-4

(B) a-2, b-1, c-4, d-3

(C) a-1, b-2, c-3, d-4

(D) a-1, b-2, c-4, d-3.


Contact. : 8400-582-582, 8604-582-582

Read the following statements and find out the incorrect

statement.

(A) Rate can also be called velocity if the direction is

specified.

(B) A general rule of thumb is that rate doubles or decreases

by half for every 100C change in either direction.

(C) Endothermic reactions are also called spontaneous

reactions while an exothermic reaction is called energy

requiring reaction.

(D) Energy difference between substrate and transition state

is called activation energy.

47


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According to induced fit theory of enzyme action

(A) Substrate induces conformational change in enzyme

(B) Substrate changes its shape after binding

(C) Conformational change takes place in substrate

(D) There is no conformational change in enzyme

48


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correct labelling

(A) a- linear curve in geometric growth,

b- sigmoid or S- curve in arithmetic

growth

(B) a- sigmoid or S- curve in arithmetic

growth, b- linear curve in geometric

growth

(C) a- sigmoid or S- curve in geometric

growth, b- linear curve in arithmetic

growth

(D) a- linear curve in arithmetic growth,

b- sigmoid or S- curve in geometric

growth

49

Time

(b)

Heig

ht

of

the p

lan

t

Time

(a)


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At asymptote stage, the population is

(A) Stabilised

(B) Increasing

(C) Decreasing

(D) Changing.

50


Contact. : 8400-582-582, 8604-582-582

Which of the following statements about enzymes is wrong

(A) Enzymes are denatured at high temperatures

(B) Enzymes are mostly proteins but some are lipids also

(C) Enzymes are highly specific.

(D) Enzymes required optimum pH and temperature for

maximum activity.

51


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correct labelling

(A) a - lag phase, b - log phase, c -

stationary phase

(B) a - log phase, b - lag phase, c -

stationary phase

(C) a - lag phase, b - exponential

phase, c - stationary phase

(D) Both A and C.

52

c

a

Time

Siz

e/w

eig

ht

of

the o

rgan

b


Contact. : 8400-582-582, 8604-582-582

Select the option which is not correct with respect to enzyme

action

(A) Malonate is a competitive inhibitor of succinic

dehydrogenase

(B) Substrate binds with enzyme at its active site

(C) Addition of lot of succinate does not reverse the

inhibition of succinic dehydrogenase by malonate

(D) A non-competitive inhibitor binds the enzyme at a site

distinct from that which binds the substrate.

53


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correct matching

(A) c-tropical forest, f-arctic and alpine

tundra, a-desert, d-temperate forest,

b-grassland, e-coniferous forest

(B) d-tropical forest, e-arctic and alpine

tundra, f-desert, e-temperate forest,

b-grassland, c-coniferous forest

(C) b-tropical forest, f-arctic and alpine

tundra, a-desert, c-temperate forest,

e-grassland, d-coniferous forest

(D) c-tropical forest, a-arctic and alpine

tundra, b-desert, d-temperate forest,

f-grassland, e-coniferous forest.

54

30

25

20

15

10

5

–5

–10

–15

0

a b

c

d

e

f

50 100 150 200 300 400250 350 450

Mean annual precipitation (cm)

Dr. Hariom GangwarMBBS (KGMU)

8+ yrs Teaching Experience

12:00

PM

05:00

PM

Live Class

Crash Course

Documents

Live Class 12:00 05:00 PM - NEET BOOSTER€¦ · [] Contact. : 8400-582-582, 8604-582-582 Arrange the steps of catalytic cycle of an enzyme in order and choose the right option