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NEET • BIOLOGY • CELL-THE UNIT OF LIFE

Cell-the unit of life practice · Hard

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Showing 1-30 of 45 questions

1 Hard

1 of 45

Understanding +4 | -1

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

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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.

2 Hard

2 of 45

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.

3 Hard

3 of 45

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.

4 Hard

4 of 45

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.

5 Hard

5 of 45

Understanding +4 | -1

Generally the smaller the cell

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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.

6 Hard

6 of 45

Remembering +4 | -1

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

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Correct option: B

52, 40

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

7 Hard

7 of 45

Understanding +4 | -1

a. The passage through which movement of RNA and protein molecules takes place in both
directions in a nuclear pore.
b. A disc-shaped structure is kinetochore is present as a lateral side of centromere.

c. DNA moves easily in both directions through the nuclear pore.

Read the following and select the correct option.

View answer and explanation

Correct option: A

a and b are true

Option A (a and b are true) is correct because RNA and protein molecules move through nuclear pores, and kinetochores are disc-shaped structures on the centromere. DNA does not move easily through the nuclear pore.

8 Hard

8 of 45

Remembering +4 | -1

Animal cell differs form plant cells in not having the:

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Correct option: D

All of these

Option D (All of these) is correct because animal cells lack cell walls and plastids, and have fewer glyoxysomes compared to plant cells.

9 Hard

9 of 45

Understanding +4 | -1

The plasma membrane of prokaryotes and eukaryotes are

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Correct option: B

Similar in structure and function

Similar in structure and function is the correct answer because both prokaryotic and eukaryotic plasma membranes are composed of a phospholipid bilayer with embedded proteins, and both function to regulate the passage of substances in and out of the cell.

10 Hard

10 of 45

Remembering +4 | -1

In the chromosomes the non-staining region is called?

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Correct option: D

Both 2 and 3

Option D (Both 2 and 3) is correct because the non-staining regions in chromosomes are the secondary constriction and the satellite region.

11 Hard

11 of 45

Understanding +4 | -1

Assertion (A): Polar molecules can not pass through non polar lipid bilayer.

Reason (R): Polar molecules require a carrier protein of the membrane to facilitate their transport across the membrane.

View answer and explanation

Correct option: B

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

Option B is correct. Both the assertion and the reason are true, but the reason does not correctly explain the assertion. Polar molecules cannot easily pass through the nonpolar lipid bilayer, and they often require carrier proteins for transport, but the need for carrier proteins is not the direct reason they can't pass through the bilayer.

12 Hard

12 of 45

Remembering +4 | -1

Cell Theory was propounded in 1838 – 39 by

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Correct option: C

1 and 2

Option C (1 and 2) is correct because Schleiden and Schwann proposed the cell theory in 1838-39.

13 Hard

13 of 45

Understanding +4 | -1

Beet root if kept in cold water anthocyanin does not come out due to plasma membrane which is

View answer and explanation

Correct option: B

Impermeable to anthocyanins

Option B (Impermeable to anthocyanins) is correct because if anthocyanins don't come out, the plasma membrane is not allowing them to pass through.

14 Hard

14 of 45

Remembering +4 | -1

The small rounded knob like fragment in a chromosome lying beyond the secondary constriction is?

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Correct option: C

Satellite

Option C (Satellite) is correct because a satellite is a small, rounded knob-like structure on a chromosome, located beyond a secondary constriction.

15 Hard

15 of 45

Understanding +4 | -1

Read the following and choose the incorrect statement.

View answer and explanation

Correct option: A

The only work of cell wall is to provide barrier to undesirable macromolecule

Option A is correct because the cell wall has multiple functions, not just acting as a barrier.

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16 Hard

16 of 45

Understanding +4 | -1

Choose the correct statements
(A) Polar molecules cannot pass through non polar lipid layer since they require carrier proteins.
(B) The plant cell vacuole plays role in osmoregulation.
(C) Golgi apparatus is the site of synthesis of proteins and glycolipids.
(D) Plasmid DNA shows resistance to antibiotics .
(E) On cell maturation, secondary wall is formed as deposition towards the outside the primary wall.

View answer and explanation

Correct option: B

A, B, D only

Option B is correct because polar molecules need carrier proteins, plant cell vacuoles help in osmoregulation, and plasmid DNA confers antibiotic resistance.

17 Hard

17 of 45

Remembering +4 | -1

In protoplasm fat store in the form of:

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Correct option: B

Triglyceride

Option B (Triglyceride) is correct because fats are stored in protoplasm in the form of triglycerides, which are composed of glycerol and three fatty acids.

18 Hard

18 of 45

Understanding +4 | -1

Both the membranes of mitochondrion are

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Correct option: B

Structurally as well as functionally different

Structurally as well as functionally different is the correct answer because the inner and outer membranes of the mitochondrion have distinct structures (e.g., cristae in the inner membrane) and perform different functions (e.g., electron transport chain in the inner membrane).

19 Hard

19 of 45

Understanding +4 | -1

Dye injected into a cell might be able to enter into adjacent cell through

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Correct option: C

Plasmodesmata

Option C is correct because plasmodesmata are channels connecting adjacent plant cells, allowing dye to pass through.

20 Hard

20 of 45

Understanding +4 | -1

Transport through sodium potassium pump in
animals

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Correct option: C

Occurs from lower to higher concentration

Option C (Occurs from lower to higher concentration) is correct because the sodium-potassium pump moves ions against their concentration gradients, requiring energy.

21 Hard

21 of 45

Remembering +4 | -1

The stain used to visualise mitochondria is?

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Correct option: D

Janus green

Option D (Janus green) is correct because Janus green is a vital stain specifically used to visualize mitochondria in living cells.

22 Hard

22 of 45

Remembering +4 | -1

Karyolymph is which one of the following.

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Correct option: A

Nuclear sap

Option A (Nuclear sap) is correct because karyolymph is another term for nuclear sap, the fluid-filled substance within the nucleus.

23 Hard

23 of 45

Remembering +4 | -1

Mark the cell junction found in epithelial layer which facilitates the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules

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Correct option: D

Gap junction

Option D (Gap junction) is correct because gap junctions are specialized cell junctions that allow direct communication between the cytoplasm of adjacent cells.

24 Hard

24 of 45

Remembering +4 | -1

9 + 2 array of microtubules is found in the core of

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Correct option: D

1 and 2

Option D (1 and 2) is correct because the 9+2 arrangement of microtubules is characteristic of both cilia and flagella.

25 Hard

25 of 45

Remembering +4 | -1

Which one of the following has its own DNA?

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Correct option: A

Mitochondria

Option A (Mitochondria) is correct because mitochondria possess their own DNA, which is circular and similar to that found in prokaryotic cells.

26 Hard

26 of 45

Remembering +4 | -1

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

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Correct option: C

flagellum

Option C (flagellum) is correct because flagella are known to exhibit the characteristic "9 + 2" microtubule arrangement in their internal structure.

27 Hard

27 of 45

Understanding +4 | -1

Assertion (A): The chromoplasts contain fat soluble carotenoid pigments.
Reason (R): These pigments provide colour to plant parts other than green.

View answer and explanation

Correct option: B

If both A and R are true, but R is not the correct explanation of A

If both A and R are true, but R is not the correct explanation of A is the correct answer because both the assertion and reason are true, but the reason doesn't directly explain why chromoplasts contain fat-soluble carotenoid pigments.

28 Hard

28 of 45

Understanding +4 | -1

Which one of the following is not related to ribosome?

View answer and explanation

Correct option: C

\mathrm{Ca}^{++}

concentration is required for association of its sub-units

\mathrm{Ca}^{++}

concentration is required for association of its sub-units is not related to ribosomes because

\mathrm{Mg}^{++}

(Magnesium) ions, not Calcium ions, are required for the association of ribosomal subunits.

29 Hard

29 of 45

Understanding +4 | -1

[A]: Pectins are abundant in middle lamella in plant cells.

[R]: Some cells in woody plants have a secondary wall that is found inside the primary wall.

View answer and explanation

Correct option: B

Both A and R are true and R is not the correct explanation of A

Option B is correct because both the assertion and the reason are true statements, but the reason does not explain the assertion.

30 Hard

30 of 45

Understanding +4 | -1

Keeping is view the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other (flip flop movement)

View answer and explanation

Correct option: D

While lipids can rarely flip flop, proteins can not

Option D (While lipids can rarely flip flop, proteins can not) is correct because lipids can undergo flip-flop movement, although rarely, while proteins are generally too large and polar to do so.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 45 single-correct-answer MCQs on CELL-THE UNIT OF LIFE.
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