Hormone X activates the cAMP second messenger system in its target cells. The greatest response by a cell would come from _____
A) applying a molecule of hormone X to the extracellular fluid surrounding the cell
B) injecting a molecule of hormone X into the cytoplasm of the cell
C) applying a molecule of cAMP to the extracellular fluid surrounding the cell
D) injecting a molecule of cAMP into the cytoplasm of the cell
E) injecting a molecule of activated, cAMP-dependent protein kinase into the cytoplasm of the cell
Answer: A
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A controlled experiment is one in which ________.
A. there are at least two groups, one differing from the other by two or more variables B. there are at least two groups, one of which does not receive the experimental treatment C. the experiment is repeated many times to ensure that the results are accurate D. the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data
What is the dependent variable in this figure?
A. number of children
B. if children were infected with flatworms
C. amount of interleukin-10 produced
D. number of white blood cells in the children's blood
E. amount of antibodies in the children's blood
Early recognition of a necrotizing skin infection is essential to decrease the risk of death
Indicate whether the statement is true or false
Diploid cell formed by the union of two gametes; the product of fertilization.
What will be an ideal response?