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amm1812
3 years ago
5

Two types of transport of molecules across a cell membrane are: Transport 1: Solute molecules move across the cell membrane alon

g their concentration gradient; requires no energy expenditure. Transport 2: Solute molecules move across the cell membrane against their concentration gradient; requires expenditure of energy. Which statement is CORRECT? A) Transport 1 describes passive transport by diffusion. B) Transport 2 describes passive transport by the Na+/K+ pump. C) Transport 2 describes passive transport by a carrier protein. D) Transport 1 describes facilitated transport of substances through the membrane.
Biology
1 answer:
Scrat [10]3 years ago
4 0

The answer is A


Transport 1 describes passive transport by diffusion

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This variation could be explained with the endosymbiotic origin of the organisms as some species could engulf the photosynthetic bacteria whereas some could have engulfed the chemosynthetic bacteria.

This can be observed in the green and red algae which depend on a different mode of nutrition belonging to the same group.

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Explanation:

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