After a hormone enters the bloodstream, it is transported throughout the body, but the hormone affects only certain cells. Only certain cells are affected because the membranes of these cells have what specific structures?

Many types of plants rely on bees for pollination. Which of the following describes the role that bees play in pollination? A. pollen cleaning B. pollen production C. pollen replication D. pollen transfer

Why are two photosystems necessary?

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago.

Why are small quantities of chlorofluorocarbons so harmful to the ozone layer? a. The chlorofluorocarbons act like ultraviolet radiation causing large amount of ozone to be produced. b.

What valuable hardwood is rapidly being cut in the tropical rain forests of malaysia, the philippines, indonesia, and indochina?

How much filtrate is eliminated as urine?

Which are examples of non-specific defenses?

Energy is released from ATP when

Genetic disorders of metabolism occur when individuals inherit a defect in one or more genes that result in the lack of a specific enzyme. Without appropriate enzyme activity, by products can accumulate in the body, sometimes with toxic effects.

True or False? An environment containing no calcium is the best for brine shrimp egg hatching.