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1
Metabolism is most accurately referred to as
A)the period when ingested nutrients enter the blood from the gastrointestinal tract.
B)the period when the gastrointestinal tract is empty of food.
C)the release of heat into the environment.
D)the sum of all activities and chemical reactions in an animal's body.
E)None of the choices accurately describe metabolism.
2
The blood concentration of insulin _______ during the absorptive state and ______ during the postabsorptive state.
A)decreases; increases
B)decreases; decreases
C)increases; decreases
D)increases; increases
3
True or False: Excess amino acids ingested are broken down by liver cells and converted into triglycerides to be stored in adipose tissue.
A)True
B)False
4
Which one of the following is affected by temperature?
A)Activity of enzymes
B)Rate of chemical reactions
C)Stability of biological membranes
D)Activity of enzymes and rate of chemical reactions
E)Activity of enzymes, rate of chemical reactions, and stability of biological membranes
5
Which of the following heat exchange methods in animals is not used by humans?
A)Radiation
B)Conduction
C)Evaporation
D)Convection
E)All of the heat exchange methods are utilized by humans





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