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labwork [276]
3 years ago
5

Which structures greatly increase the surface area for nutrient absorption in the small intestines?

Biology
2 answers:
Scilla [17]3 years ago
7 0

Answer:

VILLI

Explanation:

maksim [4K]3 years ago
5 0

Answer: villi

Explanation:

In a human digestive system, small intestine is responsible for fat digestion. small intestine consist of small finger like projections called villi which functions the fat digestion by increasing the surface area for nutrient absortion.

The surface mucous-membranous layer protects the heart of a villus. This is composed mainly of two types of cells including columnar cells which absorb the substances passed into the blood and lymphatic vessels; and goblet cells, rounded at the end, which secrete mucus into the intestinal cavity.

Hence, villi increases the surfcae area for nutrient absorption in the small intestine.

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The kcat for Rubisco is 3 sec-1 How long does it takeone<br> subunit of Rubisco to do one reaction.
bekas [8.4K]

Answer:

A subunit of Rubisco takes approximately 0.33 s to perform one reaction

Explanation:

The kcat it's a kinetic first order constant that related the properties of the enzyme substrate complexes in a mechanisms and represents the overall first order process of the transformation of the substrate-enzyme complex into product.

Also kcat can be seen as the turnover number of an enzyme, representing the maximum number of substrate molecules that the enzyme can transform into product per time unit and per active site.

If the kcat is 3 s^-1, it means Rubisco can catalyse the transformation of 3 substrate molecules per second.

So, the time that takes a single reaction, should be the inverse of kcat.

To see it more clearly, the time needed for a single reaction is the time observed divided by the number of reactions done during that time.

In other words:

3 reactions ----------- 1 s

1 reaction -------------- x

  • x=1 reaction/3 reactions.s^-1 = 1/kcat = 1/3 s ~ 0.33 s

So the time that takes one Rubisco subunit to do one reaction is approximately 0.33 s

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