Which is NOT a stimulus that exteroceptors can sense?
A. gravity
B. smell
C. light
D. muscle tension
E. sound
D. muscle tension
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You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l- b+ b-) flies are normal, but ( l- l- b- b-) flies don't move around very much and cannot detect the location of a light source. You perform a testcross and get the following results:
listless, sighted 100 listless, blind 400 normal activity, sighted 400 normal activity, blind 100 What is the distance between these two genes on the chromosome? A. They are on different chromosomes. B. They are 10 map units apart. C. They are 20 map units apart. D. They are 40 map units apart. E. They are 80 map units apart.
What was the major stumbling block for the acceptance of natural selection as a mechanism for
evolution when proposed by Darwin?
a. strong evidence for inheritance of acquired traits b. lack of a fossil record c. lack of a plausible theory of heredity d. lack of evidence for artificial selection e. lack of observational and experimental data
Select the best response to the question. ?How does tuberculosis progress from latent to active?
A) The patient's sputum turns bloody. B) It becomes active when an infected person coughs or sneezes. C) The infection droplets (bacilli) escape encapsulation and begin producing symptoms. D) The purified protein derivative (PPD) test turns positive.
Science can, or can attempt to, answer all of the following questions except _____.
A) why the parrotfish is green B) how the cheetah became such a swift predator C) the purpose for human life D) how the carbon atom is constructed E) if smoking harms a person's health