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suter [353]
2 years ago
15

A cell membrane is ___________, because it regulates what materials enter the cell.

Biology
1 answer:
vesna_86 [32]2 years ago
8 0
A cell membrane is c.selectively permeable because it regulates what materials enter the cell.
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The building blocks of DNA are like alphabet letters, because they:
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QUESTION 50<br> Cohesion, surface tension, and adhesion are the properties of water molecules that
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enable capillarity

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6 0
3 years ago
Mammals like caribou that live in the arctic often use different lipid types in their legs. Legs are more susceptible to heat lo
motikmotik

1. The lipid would be more saturated. FALSE

2. The lipids on the fatty acid tails would be much shorter. TRUE

3. The membranes would contain more cholesterol. TRUE

<u>Explanation:</u>

The mammal caribou lives I the extremely cold environment of the Arctic and thus has several physiological adaptations to survive the cold. They have short ears to reduce heat loss and have two layers of fur. The lipids in caribou legs have several adaptations

When compared with saturated fatty acids unsaturated fatty acids are more fluid at low temperatures. Thus the lipids in the legs of caribou are unsaturated to maintain fluid nature at low temperatures of the Arctic. Shorter lipids on fatty acid tails remain more fluid at low temperatures when compared with the longer ones.  

Thus the lipid in the fatty acid tails will be shorter. Similarly the presence of more cholesterol in the membranes would make it more fluid in the cold conditions of the external environment. Thus the membranes would have more cholesterol.

8 0
3 years ago
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