The vagus nerve contains afferent and efferent neurons; therefore it is an example of a(n) __________ nerve.
Fill in the blank(s) with the appropriate word(s).
Ans: mixed
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In complementary base pairing of DNA, adenine pairs with ________ (or ________ in RNA) and cytosine always pairs with ________
A) guanine / uracil / thymine B) uracil / thymine / guanine C) thymine / guanine / uracil D) thymine / uracil / guanine
The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure rates of sedimentary rock formation. B. measure the ratios of various radioactive isotopes in the deposits. C. apply the principle of superposition (younger deposits above older deposits). D. make salinity measurements in ocean sediment deposits. E. study the sequence of fossil types in the deposits.
Which of the following organisms can more
likely break down cellulose?
a. a fungus b. a cow c. a human d. a horse e. a plant
A person carrying one gene for sickle-cell hemoglobin will be resistant to Plasmodium infection.
Answer the following statement true (T) or false (F)