Competitive exclusion is based on the idea that
a. one species will hold some sort of
advantage over the other one.
b. no two species can completely occupy the
same niche.
c. the more two species overlap in their
capacity to obtain and use resources the less
likely they are to coexist.
d. all of these are true.
e. none of these are true
D
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Embryonic stem cells derived from blastocysts are pluripotent, and therefore useful in stem cell research because they ________
a. are viable under a wide range of laboratory conditions b. do not replicate and are therefore stable long-term c. can form all cells, tissues, and organs of the human body d. are specialized and therefore arrested in G0 e. function to replace damaged or diseased body parts in adults
Pollen is derived from mitosis and differentiation of ________
a. the endosperm mother cell b. megaspores c. the integuments d. microspores
What are trinucleotide repeat expansions?
a. a mutation that creates malformed bases b. repair enzymes that correct nucleotide loops c. mutations that cause codon duplications d. mutations that cause DNA triple helixes
"Artery" and "vein" are defined by whether they carry blood to the heart or away from the heart. If they were defined by whether they carried oxygenated or deoxygenated blood, we would have to change the name(s) of
A. the pulmonary artery and vein; they would have to be switched. B. the coronary artery and vein; they would have to be switched. C. the hepatic portal vein to a hepatic portal artery. D. the hepatic and renal systems; they would have to be switched. E. none, since the aorta and vena cava do not have "artery" and "vein" in their name.