Question

Please answer and explain, thank you

1) What makes an enzyme different from an ordinary catalyst? (I chose c?)

a. an enzyme is made of carbohydrates

b. an enzyme is made of DNA

c. an enzyme only catalyzes specific reactions

d. an enzyme can make a reaction go backward without energy output

2) Which of the following can enter a cell by simple diffusion?

a. oxygen

b. glucose

c. sodium

d. ATP

3) Which of the following will past most easily through the plasma membrane?

a. methane

b. water

c. glucose

d. proteins

Answer 1

QUESTION-1

ANSWER

The following makes an enzyme different from an ordinary catalyst

c. an enzyme only catalyzes specific reactions.

EXPLANATION

Enzymes are biocatalysts that increase the rate of reaction by lowering activation energy.

An enzyme is made of protein.

An enzyme can not make a reaction go backward without energy output.

They act upon the substrate to produce the product.

They catalyze specific reactions.

The substrate binds to the enzyme at the active site.

QUESTION-2

ANSWER

The following can enter a cell by simple diffusion

a. oxygen

EXPLANATION

Gases like oxygen, nitrogen, carbon dioxide etc can easily pass through the plasma diffusion.

They do not need a carrier and readily diffusable.

Ethanol can also pass the membrane readily.

Water is partially diffusable.

Other charged and macromolecules require carrier proteins to cross the barrier.

Glucose requires GLUT transporters to cross the cell membrane.

QUESTION-3

ANSWER

The following will past most easily through the plasma membrane

b. water

EXPLANATION-

Nonpolar molecules like carbon dioxide and steroid hormone can easily cross PM.

Glucose requires a carrier protein.

Water can easily pass the PM.

Proteins are too big to cross the plasma membrane so they require a carrier or channel.

GOOD LUCK!!!