You isolate piRISCs from cells. Based on what you know about how piRISCs silence transposable elements, what enzymatic activities do you anticipate will be associated with the proteins you've isolated (either in the piRISCs themselves, or in proteins that may have been associated with the piRISCs)?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

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.

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2