Which of the following is a hormone that is released by fat cells?
A) Glucagon B) Prolactin C) Leptin D) Epinephrine E) Oxytocin
C
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Neurotransmitters affect postsynaptic cells by _____
I) initiating signal transduction pathways in the cells II) causing molecular changes in the cells III) affecting ion-channel proteins IV) altering the permeability of the cells A) I and III B) II and IV C) II and III D) III and IV E) I, II, III, and IV
True or False: Altruism occurs when an individual reduces his or her own fitness and increases the fitness of another individual
A. true B. false
In which cycles are the nutrients found in a gas form?
a. atmospheric cycles b. global cycles
c. water cycles d. sedimentary cycles e. plant-animal cycles
The enzyme ________, that is found in tears and saliva, can hydrolyze the bonds in the glycan chains of certain bacterial cell walls.
Fill in the blank(s) with the appropriate word(s).