In prokaryotes, certain proteins act to regulate genes by binding to DNA. What could be the effect of these binding proteins?

How do antiviral drugs work? in your own words.

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.