The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list.

I. Diffusion - $N a^{+}$

II. Active transport - Amino acids

III. Osmosis - Water

IV. Facilitated diffusion - Glucose

III only

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II and IV

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II, III and IV only

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I, II, III and IV

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Solution

The correct option is A
III only

Osmosis is the movement of water molecules from high chemical potential to low chemical potential (water potential) along the concentration gradient, but $N a^{+}$ moves actively. Amino acids and glucose move through facilitated diffusion.

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Similar questions

Small amounts of monosaccharides like glucose, amino acids and some of electrolytes like chloride ions are absorbed by (i). However, some of the substances like fructose and some amino acids are absorbed by the mechanism called (ii). Various nutrients like amino acids and electrolytes like Na+ are absorbed into the blood by (iii).

a) i) facilitated transport ii) active transport iii) simple diffusion

b) i) simple diffusion ii) facilitated transport iii) active transport

c) i) active transport ii) facilitated transport iii) simple diffusion

d) i) simple diffusion ii) active transport iii) facilitated transport

Q. Which among the following statements are incorrect?
I. Transport proteins are needed by both facilitated diffusion and active transport.
II. Porins are carrier proteins
III. The carrier proteins needed by facilitated and active transport are specific.
IV. There is no need for energy to pump molecules against a concentration gradient in active transport.
V. Transport rate reaches saturation point when all the transport proteins are used or engaged.

Consider the following statements and choose the correct answer.

I. Carrier proteins are needed by both facilitated diffusion and active transport and are sensitive to inhibitors that react with the protein.

II. Different types of proteins present in the membrane play a major role in both active as well as passive transport.

III. The carrier proteins needed by facilitated and active transport are specific.

IV. There is no need of energy to pump molecule against a concentration gradient in active transport.

V. Transport rate reaches the saturation point when all the active proteins are used.

Q. Which of the following match is incorrect?
(i) Diffusion - Movement of substances from higher concentration to lower concentration
(ii) Osmosis - Occurs in only one direction
(iii) Semi-permeable membrane - Prevents passage of solute molecules
(iv) Endosmosis - Withdrawal of water from the vacuole
(v) Plasmolysis - Shrinkage of protoplasm when kept in hypotonic solution

Q. Which of the following statements is correct about diffusion and osmosis?
(i) In osmosis, a semipermeable membrane is used while diffusion is without membrane
(ii) In osmosis, movement of molecules occurs in one direction while in diffusion, movement occurs in all directions.
(iii) In osmosis, only the solvent moves while in diffusion both solute and solvent move

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The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list. I. Diffusion - Na+ II. Active transport - Amino acids III. Osmosis - Water IV. Facilitated diffusion - Glucose

The correct option is A III only Osmosis is the movement of water molecules from high chemical potential to low chemical potential (water potential) along the concentration gradient, but Na+ moves actively. Amino acids and glucose move through facilitated diffusion.

The following list indicates certain molecules/ions and their mechanism of transport across the cell membrane. Determine the correct pair(s) from the list.

I. Diffusion - $N a^{+}$

II. Active transport - Amino acids

III. Osmosis - Water

IV. Facilitated diffusion - Glucose

The correct option is A
III only

Osmosis is the movement of water molecules from high chemical potential to low chemical potential (water potential) along the concentration gradient, but $N a^{+}$ moves actively. Amino acids and glucose move through facilitated diffusion.