Atoms of a single element that possess different numbers of neutrons are called
A. ions.
B. polymers.
C. isotopes.
D. monomers.
E. isomers.
Answer: C
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The binding of a neurotransmitter to ligand-gated K+ channels will cause ____ in the postsynaptic membrane
a. depolarization only b. hyperpolarization c. repolarization only d. apolarization e. depolarization and repolarization
Sporadic cancers result from
A) recessive or dominant mutation in a somatic cell. B) recessive or dominant germline mutation. C) mutation in a sperm or oocyte. D) exposure to a cancer-causing virus.
Which of the following statements is a testable scientific hypothesis?
A) Antioxidants from food are better than antioxidants from a vitamin pill. B) Eating fish reduces the chance of having a stroke. C) Embryonic stem cell research will allow scientists to find a cure for diabetes. D) Smoking makes people less attractive.
Ectothermic animals:a
depend on heat from the external environment to adjust their body temperatures. b. may dilate blood vessels to increase blood flow and heat to the skin. c. maintain a relatively constant body temperature despite external temperatures. d. may have feathers to keep them insulated. e. may have body fat to keep them insulated.