Odor molecule receptors are located on the _____________ extending from olfactory receptor cells in the human nose.

A. axon
B. soma
C. cilia
D. synapse
E. oligodendrocyte


C. cilia

Biology & Microbiology

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Mendel's work was rediscoved in 1900 by which of the following individual(s)?

A. Carl Correns B. Erich von Tschermak C. Hugh de Vries D. All of the answers are correct

Biology & Microbiology

A scientist is studying a population of crickets and finds that there is variation in the songs used by males to call for mates. Some males call with high pitched 3 chirp songs and some call with low pitched 4 chirp songs. However offspring from the two types of males are able to interbreed so the scientist classifies the population as a single cricket species and goes on to another project. One year later a mutation arises in a female cricket that makes her unable to hear high frequencies. Ten years later a graduate student returns to the same cricket population and discovers that there are now two distinct cricket species in the area although they appear morphologically identical. What is the most likely explanation?

A. Temporal isolation has led to allopatric speciation. B. Sexual selection has led to sympatric speciation. C. Habitat isolation has led to allopatric speciation. D. Mechanical isolation has led to sympatric speciation. E. Gametic isolation has led to sympatric speciation.

Biology & Microbiology

When does lactase production begin to decline in humans?

a. Age 55 b. Age 5 c. Age 25 d. Never e. Age 46

Biology & Microbiology

All microscopes have objective "lenses."

a. True b. False

Biology & Microbiology