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3 years ago

All of the following statements about enzymes are true EXCEPT

Biology

1 answer:

kari74 [83]3 years ago

8 0

Answer:

(D) Enzymes can function only within living cells.

Explanation:

Enzymes are biological molecules that are proteinous in nature and speed up the rate of biological reactions.

Option A is true because enzymes are not used up or changed when they are used to catalyze reactions

Option B is true. Enzymes are very specific with regards to the reactions they take part in.

Option C is true. Some enzymes contain non-protein component that assist them in their functioning. These non-protein components are called co-factors.

Option E is true. Because enzymes are proteinous in nature, they can be destroyed/denatured by high temperatures.

The only untrue option is D. Some enzymes can function outside living cells. For example, the enzymes involved in digestion can function not just within living cells but also outside it. The functions of some of the digestive enzymes can be demonstrated in the laboratory.

The correct option is D.

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3 years ago

Which sequence would be possible for a rock going through the rock cycle?

sdas [7]

D. metamorphic -> melting -> igneous -> erosion

Explanation:

The sequence that would be the best possible for a rock going through the rock cycle is metamorphic rocks melting to produce igneous rocks that are eroded.

The rock cycle shows the pathway by which different rock types are formed.
The origin of the formation of rocks starts with the production of magma.
Igneous rocks are formed from cooling and solidification of molten magma.
Metamorphic rocks are formed from the subjection of igneous and sedimentary rocks to high temperature and pressure.
Sedimentary rocks are formed from weathering, erosion, transportation and deposition of rocks.
Option D shows a metamorphic rock melting to give igneous rocks and the igneous rock is eventually eroded to form sedimentary rocks.

learn more:

Sedimentary rocks brainly.com/question/2740663

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3 years ago

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mezya [45]

Answer:

The correct answer is- Immune system

Explanation:

There are physical, chemical and immunological barriers present in our body which helps us to protect from the foreign antigen. They all assist each other and helps in pathogen removal from our body.

The physical barrier includes skin, gastrointestinal tract, respiratory tract, etc which do not allow the microbe to enter the body. Chemical barriers include tear, saliva, acid in the stomach which kills microbes on the body surface.

Immune cells like macrophages, B cells kills microbes when it gets in the body. Lymphatic system also contain immune cells and helps in microbe removal.

So the immune system is assisted by physical barrier, chemical barrier, and lymphatic system.

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Answer:

Should be B

Explanation:

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