Transport across membrane

Question 1

1. Simple diffusionis a process requires cellular energy.is the movement of molecules from a region of higher concentration to one of lower concentration.occurs only across a selectively permeable membrane.is the movement of molecules against concentration gradient.

Answer 1

is the movement of molecules from a region of higher concentration to one of lower concentration.

Question 2

1. Specifically, osmosisrequires the expenditure of energy.is diffusion of water from one region to another.is diffusion of water across a selectively permeable membraneis diffusion of water against concentration gradient.

Answer 2

is diffusion of water across a selectively permeable membrane

Question 3

1. If one solution contains 20% NaCl and another contains 30% NaCl. The 30% solution isisotonic, compared to the 20% solution.hypotonic, compared to the 20% solutionhypertonic, compared to the 20% solution.plasmolysed, compared to the 20% solution.

Answer 3

hypertonic, compared to the 20% solution.

Question 4

1. Frog eggs usually do not have aquaporins. When the eggs are put in distilled water, these eggs willshrinkswellremain unchanged in shapeplasmolysed

Answer 4

remain unchanged in shape

Question 5

1. Referring to Question 4, water cannot enter the cell without aquaporins because the cell membrane ishydrophobichydrophilicimpermeable in naturefully permeable in nature

Answer 5

hydrophobic

Question 6

1. Scientists are now able to put aquaporins on frog eggs for experimental purposes. When these manipulated eggs are put in distilled water, these eggs willswell and possibly burst.shrink.remain unchanged in shape.plasmolysed.

Answer 6

swell and possibly burst.