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Explore popular questions from Cell Structure and Function for NEET. This collection covers Cell Structure and Function previous year NEET questions hand picked by experienced teachers.

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Cell Structure and Function

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Q 1. Match the stages of meiosis in column I to their characteristic features in column II and select the correct option using the codes given below.

{tex} \mathrm {A-(iii), B-(iv ), C-(ii) , D-(i)}{/tex}

B

{tex} \mathrm { A-(i), B-(iv ), C-(ii) , D-(iii)}{/tex}

C

{tex} \mathrm { A-(ii), B-(iv ), C-(iii) , D-(i)}{/tex}

D

{tex} \mathrm { A-(iv), B-(iii ), C-(ii) , D-(i)}{/tex}

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Q 2. When cell has stalled DNA replication fork,which checkpoint should be predominantly activated?

A

{tex} \mathrm { G } _ { 1 } / \mathrm { S } {/tex}

{tex} \mathrm { G } _ { 2 } / \mathrm { M } {/tex}

C

{tex} \mathrm { M } {/tex}

D

Both {tex} \mathrm { G } _ { 2 } / \mathrm { M } {/tex} and {tex} \mathrm { M } {/tex}

Explanation

If cell has stalled DNA replication fork, it implies that it has crossed {tex}\mathrm {CG_1}{/tex} or {tex}\mathrm {G_1}{/tex} cyclin cell cycle check point and has entered {tex}\mathrm {S}{/tex}-phase of cell cycle,where it is preparing for chromosome replication.Afterwards it will enter {tex}\mathrm{G_2}{/tex} phase and will soon approach second check point called mitotic cyclin (CM) which lies between {tex}\mathrm {G_2}{/tex} and {tex}\mathrm {M}{/tex}-phase).

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Q 3. Enzyme were discovered for the first time in -

A

Bacteria

Yeast

C

Algae

D

Spinach

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Q 4. The graph below shows the effect of substrate concentration on the rate of reaction of the enzyme greengram-phosphatase. What does the graph indicates ?

A

The rate of enzyme reaction is directly proportional to the substrate concentration.

B

Presence of an enzyme inhibitor in the reaction mixture

Formation of an enzyme substrate complex

D

At higher substrate concentration the pH increases

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Q 5. In cytochrome, Fe{tex}^{++}{/tex} is linked

Tightly

B

Loosely

C

All the above

D

None of the above

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Q 6. Which one of the following is not true for isoenzymes ?

A

isoenzymes are quartenary proteins

B

all forms synthesized by different genes’

increse activation energy of substrate.

D

All the above

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Q 7. The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four otpion (1-4) the components of reaction labelled as A, B, C and D are identified correctly?

A:Transition State B:Potential Energy C:Activation energy without D:Activation energy with

B

A:Potential energy B:Transition State C:Activation energy with D:Activation energy without

C

A:Activation energy with B:Transition State C:Activation energy without D:Potential Energy

D

A:Potential Energy B:Transition State C:Activation energy with D:Activation energy without

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Q 8. Many of the hydrolytic reactions are :

Reversible

B

Irreversible

C

Endothermic

D

Exothermic

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Q 9. Proteinaceous nature of enzyme was suggested by :

Summer

B

Kuhne

C

E.Buchner

D

Northrop

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Q 10. Cytochrome oxidase is a/an -

A

Exoenzyme

Endoenzyme

C

Proenzyme

D

Coenzyme

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Q 11. Basically the Enzymes are :

A

Vitamins

B

Fats

Proteins

D

Carbon

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Q 12. The part of a cell that can be seen with and electron microscope, but can’t with a light microscope is/are the -

A

nucleus

B

Golgi bodies

C

chloroplasts

membrane separating the nucleus from the cytoplasm

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Q 13. The organic compound present in traces in living cells can be detected and isolated by -

A

centrifugation

B

tracer technique

chromatography

D

microscopy

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Q 14. Which techique used for separation of immunoglobulins, cellular enzymes and m-RNA?

A

Ion exchange chromatography

Affinity chromatography

C

Paper chromatography

D

None of these

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Q 15. 1 A{tex}^\circ{/tex} is equal to

{tex} 10^{–8}{/tex} cm

B

{tex} 10^{–4}{/tex} cm

C

{tex} 10^{–6}{/tex} cm

D

{tex} 10^{–3}{/tex} cm

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Q 16. Electron microscope was invented by-

Knoll and Ruska

B

Rudolph and Kolliker

C

C.P. Swanson

D

None of the above

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Q 17. Phase contrast microscope is -

A

based on the scattering of light and using a dark field condenser

used for the study of living cells

C

related to retardation and thickness of object

D

the best method for studying non-living ultra structure.

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Q 18. The smallest size of a cell which can be seen with unaided eye is -

A

1 micron

B

10 micron

100 micron

D

1000 micron

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Q 19. Fuelgen reaction of DNA is due to -

aldehyde produced by acid hydrolysis

B

removal of RNA but not DNA

C

phosphoric acid carbohydrated and nitrogen based

D

phosporic acid

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Q 20. The resolving power of an electron microscope is -

A

0.000005 nm

B

0.0000005 {tex}\mu{/tex} n

C

2 {tex}\mu{/tex} n

0.025 Å

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Q 21. Which cell organelle is detected with the help of sudan black :-

A

Peroxisome

B

Glyoxysome

Sphaerosome

D

Rough E.R.

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Q 22. Magnification power of a light compound microscope depends on :-

A

Power of eye piece lens

B

Power of objective lens

C

Source of light

1 and 2 both

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Q 23. Feulgen reaction is used to stain :-

DNA

B

RNA-polymerase

C

DNA-polymerase

D

A and C both

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Q 24. Microsomes are obtained by -

A

Vital staining

B

Sonography

Fractionation of cell by ultrasonic sound waves

D

X-ray crystallography

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Q 25. Which dye is used to stain chromosomes:-

A

Acetocarmine

B

Haematoxylin

C

Feulgen

All the above