In the human digestive system, the stomach produces about 2 liters of HCl and other gastric secretions every day. The acid secretion of the stomach
A. promotes a high pH.
B. is stimulated by gastrin.
C. begins the process of starch digestion.
D. stimulates the gallbladder to contract.
E. inhibits pepsin activity.
B. is stimulated by gastrin.
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When placed in an aqueous solution, amphipathic molecules will orient themselves with
A. hydrophobic hydrocarbon chains facing the water and hydrophilic head groups in the middle. B. hydrophilic hydrocarbon chains facing the water and hydrophobic head groups in the middle. C. hydrophilic hydrocarbon chains in the middle and hydrophobic head groups facing the water. D. hydrophobic hydrocarbon chains in the middle and hydrophilic head groups facing the water.
Scientists often study lichens to look at the effects of acid rain. Why?
a. Lichens absorb water directly from air. b. Lichens are located in many diverse environments. c. Lichens can withstand droughts. d. Lichens get water from the area directly beneath trees.
What is the proton-motive force?
a. the force needed to move protons into the inner mitochondrial space b. the amount of energy required to protonate a glucose molecule c. the free energy associated with the removal of hydrogen from NADH d. the combination of a proton and voltage gradient across the inner mitochondrial membrane e. the synthesis of ATP from a proton gradient
Scramble competition results in some individuals in the population getting more resources than others
Indicate whether the statement is true or false