What is the purpose of cholesterol?

a. raw material for steroid hormones

b. structural component of cell membranes

c. raw material for myelin sheaths

d. all of these

e. a and b?

Which is a similarity between alcohol fermentation and aerobic respiration? Both require oxygen. Both require light energy. Both start with glycolysis. Both produce alcohol.

Two kinds of organisms that cannot reproduce with each other or separate

How many times does the heart beat a day

Bees are observed flying from one garden to the next pollinating plant. Which type of plants could these be?

Which type of bonding forms between water molecules? covalent hydrogen ionic metallic

Which of these is a relationship shown in Carla's food web? about surface water is most useful for explaining this observa

Match each term to its scientific definition. 1.) natural world- 2.) theory- 3.) scientific method- A. everything that can be observed or explained scientifically. B. the procedure of scientific inquiry used to investigate natural phenomena. C.

The largest component of air is

Which statement is one of the three parts of a cell theory

Separation of the nail plate from the nail bed in fungal infections is called: