Give some examples showing how cells respond to signals. How are signals terminated? What will be an ideal response?
Concepts to Consider: Regulation of ion channels in neurons; assembly of microtubules and
microfilaments in neutrophils; alteration of gene activity in Arabidopsis; termination via GTPase,
phosphodiesterase, and phosphatase
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Imagine you were the manager of a national park with cheetahs. The cheetahs feed primarily on gazelles, while the gazelles eat grass. It takes an acre of grassland to feed one gazelle, and it takes ten gazelles to feed one cheetah. You have a maximum of ten cheetahs when the system is functioning optimally. You would like to increase the cheetah population because people pay money to see the cheetahs. How much grassland do you need to double the cheetah population supported by this grassland?
A. 10 acres B. 500 acres C. 200 acres D. 100 acres
Where is your ilium?
a. part of the knee b. part of the pelvic girdle c. part of the cranium d. part of the pectoral girdle e. in the foot
A body plan with a pseudocoelom is indicated by
a. A. b. B. c. C. d. A and B. e. B and C.
Muscle contraction is an example of which of the following types of work?
A) heat B) mechanical C) bioluminescent D) electrical E) concentration