The cell membrane is made of phospholipids and is selectively permeable, or semipermeable.

Which major theme in biology does this statement represent?

How are proteins distinguished from each other? a. by the amounts of carbon, oxygen, and hydrogen they contain b. by the kinds of fatty acids they contain c. by the kinds of bonds that join their monomers d.

What is cancer and how does it relate to mitosis?

Which of the following examples of natural selection in action would tend to increase the genetic variation in the population?

What protective covering encloses the entire cell?

It is 10 a. m. and Julie is trying to decide what to prepare for tonight's dinner. She selects a frozen turkey breast and must thaw it before she can proceed with her cooking preparations.

These fossils can be best used to provide information that could be used in a study of

Describe the skeleton of a sponge

Compare the human digestive system and an assemble line in reverse

Some athletes have been accused of performing "blood doping" to improve their athletic performance. why would removing blood a month or so prior to performance, then reinfusing the blood shortly before a competition, boost performance?

Name an example of another disorder that could be caused by a nutritional deficiency.