Protozoans parasite whose multiplication is controlled by host metabolites

Viral particles capable of self perpetuation in host cytoplasm

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NEET • BIOLOGY • CELL-THE UNIT OF LIFE

Cell-the unit of life practice · Mixed difficulty

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Showing 1-30 of 219 questions

1 Easy

1 of 219

Remembering +4 | -1

Robert Hooke used the term cell in the year

View answer and explanation

Correct option: B

1665

Option B (1665) is correct because Robert Hooke first used the term \"cell\" in his book Micrographia published in 1665.

2 Medium

2 of 219

Understanding +4 | -1

The transport of metabolities across the biomembrane occurs through

View answer and explanation

Correct option: D

All of the above

Option D is correct because metabolites are transported across biomembranes through both passive and active transport, and bacteria have mesosomes.

3 Easy

3 of 219

Understanding +4 | -1

Cell is the fundamental, structural and functional unit of all living organisms because

View answer and explanation

Correct option: B

The cell is the basic unit of life

Option B (The cell is the basic unit of life) is correct because it directly states the fundamental principle of cell theory.

4 Easy

4 of 219

Remembering +4 | -1

Identify the correct pairing regarding the structure of heterochromatin.

View answer and explanation

Correct option: D

Densely packed; Stain dark

Option D (Densely packed; Stain dark) is correct because heterochromatin is densely packed DNA and stains darkly.

5 Hard

5 of 219

Understanding +4 | -1

Which is the correct sequence of modification and transport of
secretory vesicles?

View answer and explanation

Correct option: C

RER

\to

Golgi body

\to

Secretory vesicles

\to

Cell membrane

RER → Golgi body → Secretory vesicles → Cell membrane is the correct answer because proteins are synthesized in the RER, modified and packaged in the Golgi, transported via secretory vesicles, and then released at the cell membrane.

6 Hard

6 of 219

Remembering +4 | -1

Cyclosis does not occur in

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Correct option: C

Prokaryotes

Option C (Prokaryotes) is correct because cyclosis, or cytoplasmic streaming, is a characteristic of eukaryotic cells, not prokaryotic cells.

7 Hard

7 of 219

Remembering +4 | -1

Which one of the following is not a constituent of cell membrane?

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Correct option: B

Proline

Option B (Proline) is correct because proline is an amino acid and not a constituent of the cell membrane itself, unlike glycolipids, phospholipids, and cholesterol.

8 Medium

8 of 219

Remembering +4 | -1

Glycocalyx is associated with

View answer and explanation

Correct option: B

Plasma membrane

Option B (Plasma membrane) is correct because the glycocalyx is a layer of carbohydrates coating the outside of the plasma membrane in some cells.

9 Hard

9 of 219

Understanding +4 | -1

Choose the correct statements

(i) Ribosomes are found in Cytoplasm, Chloroplasts, Mitochondria and on rough ER

(ii) Mesosomes in bacteria are not the sites of DNA replication

(iii) Algae cell wall made of cellulose, galactans, mannan and calcium carbonate

(iv) Mitochondria, chloroplast and peroxisomes are the part of Endomembrane system

View answer and explanation

Correct option: C

i, iii

Option C (i, iii) is correct because ribosomes are found in the cytoplasm, chloroplasts, mitochondria, and on the rough ER, and algae cell walls are made of cellulose, galactans, mannan, and calcium carbonate.

10 Easy

10 of 219

Remembering +4 | -1

Carrier ions like

\mathrm{N}{\mathrm{a}^ + }

facilitate the absorption of substances like

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Correct option: A

Amino acids and glucose

Option A (Amino acids and glucose) is correct because carrier ions like Na+ facilitate the absorption of amino acids and glucose via secondary active transport.

11 Medium

11 of 219

Remembering +4 | -1

Two animal cells are interconnected by

View answer and explanation

Correct option: C

Desmosome

Option C (Desmosome) is correct because desmosomes are cell junctions that provide strong adhesion between animal cells, allowing them to withstand mechanical stress.

12 Medium

12 of 219

Remembering +4 | -1

Cell theory was formulated by

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Correct option: A

Schleiden and Schwann

Option A (Schleiden and Schwann) is correct because they are credited with formulating the cell theory.

13 Medium

13 of 219

Remembering +4 | -1

Kappa particles are

View answer and explanation

Correct option: D

Sub-microscopic granules formed by the folding of naked DNA

Option C (Endosymbiont representing Gram negative bacteria species) is correct because kappa particles in Paramecium are endosymbiotic bacteria.

14 Easy

14 of 219

Remembering +4 | -1

An organelle with an internal cross section showing characteristic “9+2” array is the

View answer and explanation

Correct option: C

Cilium or flagellum

Option C (Cilium or flagellum) is correct. Cilium and flagellum are characterized by a \"9+2\" microtubule arrangement in their internal structure.

15 Medium

15 of 219

Remembering +4 | -1

Which of the given cell organelles is the important site of glycosylation of proteins?

View answer and explanation

Correct option: B

Golgi apparatus

Option B (Golgi apparatus) is correct because the Golgi apparatus is the primary site for glycosylation of proteins in eukaryotic cells.

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16 Medium

16 of 219

Remembering +4 | -1

The shorter and longer arms of a submetacentric chromosome are referred to as

View answer and explanation

Correct option: B

p – arm and q – arm respectively

Option B (p – arm and q – arm respectively) is correct because, by convention, the shorter arm of a submetacentric chromosome is designated as the 'p' arm, and the longer arm is designated as the 'q' arm.

17 Easy

17 of 219

Understanding +4 | -1

Assertion (A): A single human cell has approximately two meter long thread of DNA distributed in each chromosome.

Reason (R): During different stages of cell division cells show organized nucleus in place of chromosome.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option C ((A) is true but (R) is false) is correct because a single human cell does have approximately two meters of DNA, but cells do not show organized nucleus in place of chromosome during cell division.

18 Medium

18 of 219

Understanding +4 | -1

Fluid nature of plasma membrane helps in all, except

View answer and explanation

Correct option: D

Active transport through ion channels

Active transport through ion channels is the correct answer because active transport requires specific protein pumps and energy (ATP), and is not directly facilitated by the fluidity of the plasma membrane itself.

19 Easy

19 of 219

Understanding +4 | -1

Functions not associated with peroxisomes

i. Converstion of stored lipids to carbohydrates

ii. Catabolism of fatty acids

iii. Involve in photophosphorylation

iv. Production of Hydrogen peroxide

v. Synthesis of phospholipids

The correct answer is

View answer and explanation

Correct option: A

i, iii, iv

Option A (i, iii, iv) is correct because peroxisomes are involved in lipid conversion, fatty acid catabolism, hydrogen peroxide production, and phospholipid synthesis, but not photophosphorylation.

20 Easy

20 of 219

Remembering +4 | -1

The plasma membrane consists mainly of

View answer and explanation

Correct option: B

Proteins embedded in a phospholipid bilayer

Option B (Proteins embedded in a phospholipid bilayer) is correct because the plasma membrane is primarily composed of a phospholipid bilayer with proteins embedded within it, according to the fluid mosaic model.

21 Medium

21 of 219

Understanding +4 | -1

Arrange the following steps in a correct sequence as per Gram’s staining technique
I. Treatment with 0.5% iodine solution
II. Washing with water
III. Treatment with absolute alcohol/acetone
IV. Staining with weak alkaline solution of crystal violet
The correct sequence is

View answer and explanation

Correct option: B

\to

\to

\to

III

Option B (IV → I → II → III) is correct because the correct sequence for Gram's staining is crystal violet, iodine, water wash, and then alcohol/acetone.

22 Hard

22 of 219

Understanding +4 | -1

Generally the smaller the cell

View answer and explanation

Correct option: C

It will be more metabolically active

Option C (It will be more metabolically active) is correct because smaller cells have a larger surface area to volume ratio, facilitating higher metabolic rates.

23 Easy

23 of 219

Understanding +4 | -1

Which of the following statements are correct? I. Mycoplasmas are the smallest cells II. Nerve cells are some of the longest cells III. Ribosomes are non-membrane bound organelles found only in eukaryotic cells IV. The cytoplasm is the main arena of cellular activities only in plant cells

View answer and explanation

Correct option: B

I and II

Option B (I and II) is correct because Mycoplasmas are the smallest cells and nerve cells are some of the longest cells, while statements III and IV are incorrect.

24 Easy

24 of 219

Understanding +4 | -1

Difference between the prokaryotic and eukaryotic cells in having

View answer and explanation

Correct option: B

Nuclear Membrane

Option B (Nuclear Membrane) is correct because prokaryotic cells lack a nuclear membrane, while eukaryotic cells have a well-defined nucleus enclosed by a nuclear membrane.

25 Medium

25 of 219

Understanding +4 | -1

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

View answer and explanation

Correct option: B

Super-coiling in nucleosomes

Super-coiling in nucleosomes is the correct answer because DNA is packaged into nucleosomes, which are then further coiled and supercoiled to fit within the nucleus.

26 Medium

26 of 219

Understanding +4 | -1

Complete the given NCERT statements (I-III) by choosing appropriate options for the blanks (A-D) I. Cells that have membrane bound nuclei are called …A… II. In both …B… and …C… cells, cytoplasm is the main arena of cellular activities III. Cell that lack a membrane bound nucleus are called …D…

View answer and explanation

Correct option: B

A-eukaryotic cells, B-animal cells, C-plant cells, D-prokaryotic cells

Option B (A-eukaryotic cells, B-animal cells, C-plant cells, D-prokaryotic cells) is correct as it accurately completes the statements based on cell structure and organization.

27 Medium

27 of 219

Understanding +4 | -1

Comparing small and large cells, which statement is correct?

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Correct option: C

Small cells have a large surface area per volume ratio

Option C (Small cells have a large surface area per volume ratio) is correct because a higher surface area to volume ratio facilitates efficient exchange of nutrients and waste.

28 Easy

28 of 219

Understanding +4 | -1

The fluidity of membranes in a plant in cold weather may be maintained by

View answer and explanation

Correct option: A

Increasing the number of phospholipids with unsaturated hydrocarbon tails

Option A (Increasing the number of phospholipids with unsaturated hydrocarbon tails) is correct because unsaturated fatty acids increase membrane fluidity at low temperatures.

29 Easy

29 of 219

Understanding +4 | -1

Consider the following statements and choose the correct one

View answer and explanation

Correct option: B

Ribosomes are the site of protein synthesis

Option B (Ribosomes are the site of protein synthesis) is correct because ribosomes are the cellular organelles responsible for translating mRNA into proteins.

30 Hard

30 of 219

Remembering +4 | -1

The membrane of the erythrocytes has approximately _________% of proteins and _______% lipids.

View answer and explanation

Correct option: B

52, 40

Option B (52, 40) is correct because the erythrocyte membrane consists of approximately 52% proteins and 40% lipids.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 219 single-correct-answer MCQs on CELL-THE UNIT OF LIFE.
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