AAA

Breathing in animals involves the exchange of CO2 and O2 with their external environment. Diffusion of CO2, away from the tissues of their bodies and O2 into the tissues of their bodies is cause by the function of their ____ organelles.

A. mitochondria

B. chloroplasts

C. neither

D. both

i think its A or C. cant decide

____ metabolism is dependent upon the Citric Acid (Kreb) Cycle in both plants and animals.

a.lipid

b.carbohydrate

c.amino acid

d. nucleotide(purines and pyrimidines)

e. all of these molecules

the proper name for the binding site of a reactant molecules acted upon by enzymes is the ___ site?

a. active

b.allosteric

c. metabolic

d. quanternary

Enzymes____ the energy of activation (Ea)?

A. Increase

B.Decrease

C. Have no effect on

The currently accepted model of cell membranes that incorporates the existence of various proteins in membranes is called the _________ model?

a. fluid-mosaic

b. bilayer

c. sandwich

d. protein mediated

e. super

Choose the correct pair : The cytoskeleton fiber and its primary protein

a) microtubule and actin

b)microfilament and tubulin

c) intermediate filament and keratin

which portion of integral proteins is embedded within the bilayer(among fatty acids of the membrane)?

a)the water-soluble part

b) the lipid soluble part

If two solutions one 30% NaCI an the other 10% NaCI are seperated by a membrane that functions like a cell membrane, what will the concentrations of the solutions be at equilbrium?

A) 0%NACI

B)10% NACI

C) 15% NACI

D) 20% NACI

The most abundant and primary structure is-

a) cholestrol

b) gilcollipid

c) glycoprotien

d) phospholipid

e) protien?