To test whether the XFF signal system is similar to that of epinephrine, you microinject a nonhydrolyzable analogue of GTP into an XFF-responsive cell. If the XFF mechanism is similar to that of epinephrine, you would expect the cellular response to be
A) blocked completely.
B) prolonged.
C) delayed.
D) 50 percent of normal.
E) It is not possible to predict without knowing how many receptors are present on the cell.
Answer: B
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What is the main reason that a person sitting on the beach with an air temperature of 15 °C loses heat less rapidly than when immersed in lake water at 15 °C?
A) Water conducts heat more efficiently than air does. B) Water evaporates, and heat is lost to evaporation. C) Metabolic heat production is greater in air than in water. D) Air is a poor insulator.
A group is considered polyphyletic if
A. all members of the group share a common ancestor. B. not all descendants of the common ancestor are included. C. all members share homoplastic traits. D. the group does not contain the most recent common ancestor. E. it is the most parsimonious grouping.
During which phase of growth are bacteria most susceptible to antibiotics?
A. Lag B. Stationary C. Exponential (log) D. Decline
Isotopes of the same element differ from each other in the number of ____
a. electrons and protons b. neutrons only c. protons and neutrons d. electrons only e. protons, neutrons, and electrons