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labwork [276]
3 years ago
7

In active transport, this is a cell transport (biology) question, what are the two main characteristics?

Biology
1 answer:
kakasveta [241]3 years ago
5 0
The 2 main characteristics of active transport are that energy is needed in the form of ATP to move molecules and other ions against the concentration gradient, from low to high concentration of the said substance and also the transport is mediated or assisted by certain carrier proteins, a certain kind of transmembrane protein that spans across the complete width of the membrane.
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Match each term with the appropriate definition.
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Answer:

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Diffusion is movement of a molecule from an area of higher concentration to an area of lower concentration. True or false
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A scientist observes that, when the pH of the environment surrounding an enzyme is changed, the rate the enzyme catalyzes a reac
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Answer:

A- A pH change can cause the enzyme to change its shape

Explanation:

A rise or fall in the pH of the medium from the optimum of pH 7 usually affect  the  enzymes' active sites  of  and therefore the  shape and  the  rate of enzyme activity.

Assuming  the pH is too low, the enzyme medium becomes acidic;Acidosis. The high Hydrogen ions concentration  interacts with the R-groups of the amino acids moiety of the enzymes, this interaction affects the ionization of the  R-groups, disrupting the ionic bonding holding these R-groups in shape.

This results in loss of the 3-Dimensional shape arrangements of the protein molecule  and therefore of the active sites. Since active sites of  enzymes  determines the specificity of the <u>enzymes substrate- complex </u> to give <u>enzyme-product complex,</u> the catalytic activity of the enzymes decreases, <u>the rate of  reaction decreases,and products formation stops, and the reaction also stops.</u>

The same is applicable to extremely high pH=Alkalosis.

However, the effective buffer system of the body prevents this scenarios from happening in real sense in the body. Through mopping by the  haemoglobin, excretion by the kidney, etc

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Fibre is a carbohydrate that the body can not digest or assimilate
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<span>Fibre that soluble can bind to bile and cholesterol and pull it out of circulation. this can help to decrease blood cholesterol.</span>
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3 years ago
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