Define selectively
permeable membrane. Why are these important to the cell?

refers to a membrane that controls what enters or exits the cell. It is important
because it ensures that mineral and protein components enter the cell in a
controlled manner through some special pores.

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What is diffusion? What
is osmosis? How are they the same and how are they different?

is a process whereby particles move from a region of high concentration to a
region of low concentration.

is the movement of water molecules from a region where they are highly
concentrated to where they are less concentrated through a semi-permeable

two processes are similar in that; both are passive (do not require energy to
take place) and the both involve movement of particles/molecules from a region
of high concentration to regions of low concentration.

difference between osmosis and diffusion is that, in diffusion, both the solute
and solvent particles move freely while in osmosis, only water molecules move
across the membrane.

Describe the difference
between passive transport and active transport.

passive transport, ions move from a region of high concentration to a region of
low concentration without the use of metabolic energy.

transport is where ions move from low concentration to high concentration by
use of metabolic energy which is usually in the form of ATP.

What is an enzyme? What
type of biological molecule are enzymes made from?

enzyme refers to a biological catalyst that accelerates chemical reactions in
the cells of living organisms without being affected by the process.

are majorly protein molecules and hence made up of amino acids.

What is the difference
between and exergonic and endergonic chemical reaction?

reaction is a type of reaction in which energy is lost from the system to the
surrounding and the bonds formed are stronger than those being broken.

reaction on the other hand is one where energy is absorbed from the
surroundings and the bonds being formed are weaker than those broken.

What is an active site?

active site refers to that part of an enzyme that binds to the catalytic site
where a reaction takes place