Channels that open in response to neurotransmitters or other signal molecules are called _______ channels.
a. voltage-gated
b. ligand-gated
c. signal-gated
d. ion
Answer: b. ligand-gated
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"Gluconeogenesis" is the process in which
A. glucose levels are decreased in the blood through the breakdown of carbohydrates. B. glucose levels are decreased in the blood by synthesis of glucose from noncarbohydrate sources. C. glucose levels are increased in the blood by synthesis of glucose from noncarbohydrate sources. D. amino acids are generated for processes like building muscle tissue. E. glucose levels are increased in the blood through the breakdown of carbohydrates.
Which of the following is false about type 2
diabetes? a. It has a genetic basis. b. It can result from insulin shock. c. Obesity and sedentary lifestyles put one at increased risk. d. Target cells do not respond normally to insulin. e. Rates are currently soaring, and the disease is now a serious public health issue.
Environmental factors which can mediate resistance include
A) pH B) Cation concentration C) Atmospheric conditions D) Thymidine concentration E) All of the above
People homozygous for the sickle-cell anemia allele develop a life-threatening disease, while those homozygous for the normal allele are at the highest risk of dying from malaria. Carriers have some resistance to malaria but do not develop sickle cell anemia. This is an example of
A. genetic bottleneck. B. heterozygote advantage. C. point mutation. D. heterozygosity. E. founder effect.