A cell needs more than water to survive and reproduce. Use the following forms o

Question

A cell needs more than water to survive and reproduce. Use the following forms of transport across the membrane to answer the questions below: Simple diffusion Osmosis Facilitative diffusion Active transport Phosphotranferase (group translocation) How does a: cell transport a lactose molecule ac across its can membrane with the concentration gradient? prokaryotic call transport a large quantity of glucose across its cell membrane? cell transport an oxygen molecule across its cell membrane (with the gradient)? cell transport a lactose molecule across its cell membrane against the concentration gradient? Which of the above forms of transport require an input of energy to work?

Explanation / Answer

5. a. Lactose is moving with the concentration gradient. As it is a simple dissacharide sugar which is soluble in water, it moves inside the cell along with water through diffusion.

b. In prokaryotic cells, sugar transfer occurs through the phosphotranferase system, where phosphoenolpyruvate is used as the source of energy for transfers of sugars such as glucose, mannose, fructose wtc.

c. Most gases including oxygen are transferred passively through diffusion across the cell membrane. The membrane is porous enough for gases to pass.

d. Transfer of lactose against the gradient is done by lactose permease, using energy from the proton gradient. Thus it is a form of active transport.

Active transport and phosphotranferase system require energy input to work.

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