Which digestive structures in humans secrete amylase?
a. liver and gallbladder
b. liver and pancreas
c. pancreas and gallbladder
d. pancreas and salivary glands
e. pancreas, liver, and salivary glands
D
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Most mobile DNA consists of
A) transposable elements. B) introns. C) linear chromosomes. D) plasmids.
What conclusion is consistent with these results?
A researcher is studying coat color in mice. Wild-type fur in mice is brown. Three pure-breeding strains of mice with white fur have been isolated. The strains are called milky, blanc, and weiss. White fur is a recessive trait in each strain. These mice are crossed to each other in pairs and the progeny phenotypes are recorded. milky × blanc = all white progeny milky × weiss = all brown progeny blanc × weiss = all brown progeny A) All three strains have mutations in the same gene. B) All three strains have mutations in different genes. C) The milky and blanc strains have mutations in the same gene; weiss has a mutation in a different gene. D) The milky and weiss strains have mutations in the same gene; blanc has a mutation in a different gene. E) The weiss and blanc strains have mutations in the same gene; milky has a mutation in a different gene.
According to the intermediate disturbance
hypothesis, a. species richness becomes greatest in between disturbances of moderate intensity or frequency. b. a disturbance is necessary during succession in order to stabilize the community. c. community succession is highly predictable. d. competition and other species interactions are the most important factors in shaping community structure. e. a community reverts to a climax state after a disturbance.
Thermoreceptors in the brainstem detect internal changes in temperature
____________________ Indicate whether the statement is true or false.