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Cell Structure MCQs for NEET — Zoology Questions with Answers

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The mandatory combination responsible for assembly of microtubules are

$N a^{+}$ and $C a^{2 +}$

$M g^{2 +}$ and $C a^{2 +}$

$C l^{-}$ and $C a^{2 +}$

$N a^{+}$ and $K^{+}$

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Explanation

Richard Weinsberg (1972) reported the tubulin polymerisation by addition of $M g^{2 +}$ and $C a^{2 +}$ . Microtubule could be disassembled and reassembled over and over by changing on concentration and lowering and raising the temperature.

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What is correct about the movement of substance across the membrane in facilitated diffusion?

It is an active transport.

It cause transport of molecules from low concentration to high concentration.

It is insensitive to inhibitors.

It is a very specific transport.

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Explanation

(d) : In facilitated diffusion special proteins help move substances across membranes along the concentration gradient without expenditure of energy. Facilitated diffusion is very specific, it allows cell to select substances for uptake. It is sensitive to inhibitors which react with protein side chains.

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Find the correct one.

A. All the solutes have lower water potential than pure water given that solution is under external pressure B. All the solutions have lower water potential than the pure water C. All the solutions have higher water potential than the pure water D. All the solutions have lower water potential than pure water unless solution is under such external pressure which is more than the solute potential

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Explanation

11.2.1 Water Potential

Page number-179

Transport in Plants

Hint: Formula of Water Potential

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For a solution at atmospheric pressure

A. Solute potential is more than water potential B. Water potential more than solute potential C. Solute potential is less than water potential D. Water potential is equal to solute potential

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Explanation

11.2.1 Water Potential

Page number-179

Transport in Plants

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Plants have

A. Positive water potential when cells get turgor pressure B. Negative water potential when water is transported up a stem C. Negative pressure is developed in the cell dure to turgor pressure D. Both A and B

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Explanation

11.2.1 Water Potential

Page number-180

Transport in Plants

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If the cell gets water from surroundings, now a certain pressure develops inside it against the wall is called as

A. Turgor pressure B. Wall pressure C. Osmotic Pressure D. Solute pressure

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Explanation

11.2.1 Water Potential

Page number-179

Transport in Plants

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Cell wall is

A. Freelly permeable B. Impermeable C. Semipermeable D. Selectively permeable

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Explanation

11.2.2 Osmosis

Page number-179

Transport in Plants

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In plant cell

A. Solute potential is contributed by cytoplasm B. Solute potential is contributed by cytoplasm and as well as vacuolar sap C. Solute potential is because of vacuolar sap only D. Solute potential is caused by nucleoplasm

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Explanation

11.2.2 Osmosis

Page number-180

Transport in Plants

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In plant cell, which of the following is important determinants of movement of molecules in or out of the cell?

A. Cell wall B. Cell membrane C. Tonoplast D. Both B and C

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Explanation

11.2.2 Osmosis

Page number-180

Transport in Plants

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Osmosis

A. Diffusion of water across a differentially or selectively permeable membrane B. Diffusion of water across a semipermeable membrane C. Diffusion of water across a freely permeable membrane D. Both A and B

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Explanation

11.2.2 Osmosis

Page number-180

Transport in Plants

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