In a resting neuron:a
the concentration of potassium ions is about 10 times greater inside the cell than in the
extracellular fluid.
b. excitatory postsynaptic potentials hyperpolarize the membrane.
c. voltage-activated sodium channels are pumping sodium inside the cell against its
concentration gradient.
d. the membrane is more permeable to sodium than potassium ions.
e. inhibitory postsynaptic potentials depolarize the membrane.
A
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Laboratory simulations provide indirect evidence that organic compounds such as __________ and __________ selfassemble
spontaneously under conditions like those thought to have prevailed on the early Earth. Fill in the blank(s) with the appropriate word(s).
In the accompanying figure, pollination is occurring at the point(s) labeled as:
a. A b. B c. C d. D e. C and D
Where does digestion of lipids in humans begin?
a. in the small intestine b. in the stomach c. in the pancreas d. in the mouth
Osteogenesis imperfecta is a rare human condition caused by a mutation in a gene encoding Type I collagen. In some forms of the disease, the mutation leads to the production of procollagen that has a defective extension sequence; this defect interferes with the assembly of functional collagen fibers. Which of the following symptoms would you expect to see in individuals with osteogenesis imperfecta?
A. thin discs between vertebrae B. defective kidneys and capillaries C. very strong tendons and ligaments/tight joints D. very weak bones E. respiratory problems/lung defects