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Anestetic [448]
3 years ago
8

The nucleus of an atom is made of _______.

Biology
2 answers:
Sergeu [11.5K]3 years ago
7 0

Answer:

B - Protons and Neutrons

Explanation:

This is because the electrons are in the electron cloud.

HACTEHA [7]3 years ago
6 0
B is the correct answer the electrons form the outer layer
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The rate of a reaction catalyzed by an enzymes usually ________ with temperature; however, at temperatures above the optimum ran
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Answer:

increases; protein denaturation occurs

Explanation:

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However,once the optimum temperature has been exceeded,enzyme activities drops.This is because below optimum the rate of collision between the enzyme active sites and substrate molecules is very high,therefore more products are formed which increases the rate of reactions.

At temperature above the optimum,the high temperature  breaks the bonds,especially the hydrogen bonds holding the 3D structure of the active sites.Therefore,substrate molecules can not fit into the active site,and therefore enzymatic actives of the enzyme is affected,and the enzyme is said to be  denatured

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Describe the ways by which substances can cross the phospholipid bilayer
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Explanation:

Simple Diffusion across the Cell (Plasma) Membrane The structure of the lipid bilayer allows only small, non-polar substances such as oxygen and carbon dioxide to pass through the cell membrane, down their concentration gradient, by simple diffusion.

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How are photosynthesis and cellular respiration different?
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Answer:

photosynthesis is what organisms use to create food and energy. this comes from the sun. and cellular respiration is carbon dioxide that comes from the animal after photosynthesis

Explanation:

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Active transport requires cellular energy for substances to cross the cell membrane; passive transport does not.

Explanation:

Active Transport works against the concentration gradient and therefore needs energy to make it happen

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