Cyclin dependent kinases (Cdk) are proteins that work with cyclin regulatory proteins. The cyclins are associated with different checkpoints of the cell cycle. Different phases of the cell cycle experience activation and/or deactivation of specific cyclin-Cdk complexes. Referring to the graph, what phase is there a drastic decrease in three of the cyclins?

A) Mitosis
B) S phase
C) G1 phase
D) G2 phase

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.

In 2001, records showed that local stocks of fish were down worldwide. yet, records of harvests indicated that fish were being taken at records rates. what was actually happening?

Which of the following organisms are capable of self-fertilization? a. plants b. tigers c. humans