Short (5-10 $\mu $ m) hair-like narrow protoplasmic process

With sweeping or pendular movements

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NEET • BIOLOGY • CELL-THE UNIT OF LIFE

Cell-the unit of life practice · Easy

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Showing 1-30 of 77 questions

1 Easy

1 of 77

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 Easy

2 of 77

Understanding +4 | -1

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

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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.

3 Easy

3 of 77

Remembering +4 | -1

Identify the correct pairing regarding the structure of heterochromatin.

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Correct option: D

Densely packed; Stain dark

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

4 Easy

4 of 77

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.

5 Easy

5 of 77

Remembering +4 | -1

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

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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.

6 Easy

6 of 77

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.

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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.

7 Easy

7 of 77

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.

8 Easy

8 of 77

Remembering +4 | -1

The plasma membrane consists mainly of

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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.

9 Easy

9 of 77

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

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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.

10 Easy

10 of 77

Understanding +4 | -1

Difference between the prokaryotic and eukaryotic cells in having

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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.

11 Easy

11 of 77

Understanding +4 | -1

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

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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.

12 Easy

12 of 77

Understanding +4 | -1

Consider the following statements and choose the correct one

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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.

13 Easy

13 of 77

Understanding +4 | -1

What are the differences between plant cell and animal cell among the following ?

(A) Cell wall

(B) Cell membrane

(C) Ribosomes

(D) Centrioles

(E) Large central vacuole

(F) Plastids

View answer and explanation

Correct option: D

A, D, E, F only

Option D (A, D, E, F only) is correct because cell wall, centrioles, large central vacuole, and plastids are the key differences between plant and animal cells.

14 Easy

14 of 77

Remembering +4 | -1

The chemical substances found most abundantly on the middle lamella are released into the phragmoplast by

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Correct option: B

Golgi complex

Option B (Golgi complex) is correct because the Golgi complex packages and transports materials, including the chemical substances for cell wall formation, to the phragmoplast during cell division.

15 Easy

15 of 77

Understanding +4 | -1

Organisation of a cell has not been achieved in

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Correct option: A

Bacteriophage

Option A (Bacteriophage) is correct because bacteriophages are viruses and not cells, thus lacking cellular organization.

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16 Easy

16 of 77

Understanding +4 | -1

Select the wrong statement from the following

View answer and explanation

Correct option: B

Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane

Option B (Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane) is correct because only chloroplasts have thylakoids and thylakoid membranes; mitochondria have cristae.

17 Easy

17 of 77

Understanding +4 | -1

The plasmid DNA confers certain unique characters to bacteria in which they are found. This include
I. resistance to antibiotics
II. no resistance to antibiotics
III. monitor bacterial transformation with foreign DNA
The correct option is

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Correct option: A

Only I

Option A (Only I) is correct because plasmids often carry genes that confer antibiotic resistance to bacteria.

18 Easy

18 of 77

Understanding +4 | -1

Which of the following statements with respect to Endoplasmic Reticulum is incorrect?

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Correct option: D

In prokaryotes only RER are present

In prokaryotes only RER are present is incorrect because prokaryotes lack membrane-bound organelles like the endoplasmic reticulum (both RER and SER).

19 Easy

19 of 77

Remembering +4 | -1

Tubulin protein occurs in

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Correct option: D

Microtubules

Option D (Microtubules) is correct because tubulin is the protein that forms microtubules, which are components of the cytoskeleton.

20 Easy

20 of 77

Understanding +4 | -1

Which of the following statements are correct? I. Occurrence of different types of tissues, organs and organ system results in division of labour II. A new cell always develops by the division of a pre-existing cells III. Cells are totipotent IV. Cell is the smallest unit, capable of independent existence and performing the essential functions of life The correct option is

View answer and explanation

Correct option: D

I, II, III and IV

Option D (I, II, III and IV) is correct because all the statements are fundamental principles of cell biology.

21 Easy

21 of 77

Remembering +4 | -1

Cell theory was proposed by

View answer and explanation

Correct option: B

Schleiden and Schwann

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

22 Easy

22 of 77

Understanding +4 | -1

All the statements are correct for prokaryotic cells, except

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Correct option: A

Few prokaryotic have cell walls without muramic acid

Option A is correct because most prokaryotes *do* have cell walls containing muramic acid, making the statement that *few* do incorrect.

23 Easy

23 of 77

Understanding +4 | -1

Choose the incorrect about mitochondria

View answer and explanation

Correct option: A

Has 80S ribosome

Has 80S ribosome is incorrect because mitochondria have 70S ribosomes, similar to prokaryotes, not 80S ribosomes which are found in the eukaryotic cytoplasm.

24 Easy

24 of 77

Remembering +4 | -1

What is a genophore?

View answer and explanation

Correct option: B

DNA and RNA in prokaryotes

Option A (DNA in prokaryotes) is correct because a genophore is the DNA molecule in a prokaryotic cell, often circular and not enclosed in a nucleus.

25 Easy

25 of 77

Understanding +4 | -1

Select the wrong statement about prokaryotic cells.

View answer and explanation

Correct option: C

All prokaryotes have a cell wall surrounding the cell membrane.

Option C (All prokaryotes have a cell wall surrounding the cell membrane) is the wrong statement because some prokaryotes, like Mycoplasma, lack a cell wall.

26 Easy

26 of 77

Remembering +4 | -1

Cilia are

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because cilia are short, hair-like processes with sweeping movements and are more numerous than flagella.

27 Easy

27 of 77

Analyzing +4 | -1

Based on the coordinated functions of cell organelles,
choose the odd one from the following options

View answer and explanation

Correct option: A

Peroxysome

Option A (Peroxysome) is the odd one because the other three (Lysosome, Golgi complex, Vacuole) are part of the endomembrane system.

28 Easy

28 of 77

Remembering +4 | -1

Cell adhesion and cell recognition occur due to biochemicals of cell membrane named

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Correct option: C

Glycoproteins and glycolipids

Option C (Glycoproteins and glycolipids) is correct because glycoproteins and glycolipids, located on the cell surface, play crucial roles in cell adhesion and cell recognition.

29 Easy

29 of 77

Understanding +4 | -1

Assertion (A): A cell membrane shows fluid behavior.

Reason (R): A membrane is a mosaic or composite of diverse lipids and proteins.

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Correct option: B

If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the reason doesn't directly explain why the membrane shows fluid behavior.

30 Easy

30 of 77

Remembering +4 | -1

In animal cell, reserve food is usually

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Correct option: D

Glycogen and fat

Option D (Glycogen and fat) is correct because animal cells primarily store reserve food in the form of glycogen and fat.

Revision notes and key takeaways

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Key Takeaways

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