A small number of cell surface receptors can ultimately generate a large intracellular response due to activation of kinase cascades. This is referred to as:
A. signal transduction.
B. signal dampening.
C. signal activation.
D. signal amplification.
Answer: D
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Some cells of the stomach and brain produce which
of the following hormones when the stomach is empty? a. leptin b. ghrelin c. gastric juice d. pancreatic hormones e. cholecystokinin
The ________ cells are those body cells of humans that contain 23 chromosomes
Fill in the blank(s) with correct word
Which of the following were probably factors that permitted early plants to successfully colonize land?
1. the relative number of potential predators (herbivores) 2. the relative number of competitors 3. the relative availability of symbiotic partners 4. air's relative lack of support, compared to water's support A) 1 and 2 B) 2 and 3 C) 3 and 4 D) 1, 2, and 3
When protein molecules are used as fuel for cellular respiration, __________ are produced as waste.
Fill in the blank(s) with the appropriate word(s).