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3 years ago

All of the following are true concerning enzymes, except that they:

Chemistry

1 answer:

suter [353]3 years ago

8 0

Answer:

D (or E If properly listed to include the active site option)

Explanation:

A. Is true

Enzymes are organically biochemical catalyst and thus they can speed up the rate of chemical reaction in the body

B is true

They are catalysts as said earlier

C is true

They have active sites. An enzyme does not act on all substrates. They have particular group on which they can act. For example, we have carbohydrates enzymes that act on carbohydrates substrate only. This enzymes have no business acting on a protein substrate.

D. Enzymes are proteins

One of the important characteristics of enzymes is that they are protenious in nature

E. This is wrong. Enzymes like any over catalyst are not consumed in the course of the biochemical reaction

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3 years ago

chemistry student needs of thiophene for an experiment. She has available of a w/w solution of thiophene in carbon tetrachloride

kumpel [21]

The question is incomplete, here is the complete question:

A chemistry student needs 75 g of thiophene foran experiment. He has available 0.50 kg of a 29.3% w/w solution of thiophene in carbon tetrachloride.

Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.

Answer: The mass of solution the student should use is 255.97 grams

Explanation:

We are given:

Mass of thiophene needed = 75 gram

29.3 % w/w thiophene solution

This means that 29.3 grams of thiophene is present in 100 grams of solution

Applying unitary method:

If 29.3 grams of thiophene is present in 100 grams of solution

So, 75 grams of thiophene will be present in = $\frac{100}{29.3}\times 75=255.97g$

Given amount of solution = 0.50 kg = 500 grams (Conversion factor: 1 kg = 1000 g)

Hence, the mass of solution the student should use is 255.97 grams

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