All of the following are found in eukaryotic cells EXCEPT
a. a nucleus.
b. a mitochondrion.
c. a nucleoid.
d. ribosomes.
C
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Which answer correctly matches a muscle characteristic with the appropriate muscle type?
a. rapid contraction rates, smooth muscle b. transverse striping, smooth muscle c. centrally positioned nucleus, skeletal muscle d. branched cells, cardiac muscle
Which of the following events occurs in blood in body tissue?
a. free H+ releases from hemoglobin. b. erythrocyte HCO3 ? enters the plasma. c. in the plasma, HCO3 ? and H+ convert into CO2 and H2O. d. in erythrocytes, carbonic anhydrase converts HCO3 ? and H+ into CO2 and H2O. e. CO2 binds to hemoglobin.
The mycorrhizal relationship you studied in a
previous chapter is an example of
a. commensalism. b. mutualism. c. competition. d. predation. e. parasitism
If you found a mutation, involving the loss of two bases, which was present in humans living on all four continents which you could test but was absent in close relatives such as gorillas and chimps, what would this imply?
A. Two bases were actually insertions in the nonhuman primates. B. Deletion arose before the branch between humans and nonhuman primates. C. Deletion arose in multiple nonhuman primates. D. Deletion arose at least six times in different human populations. E. Deletion arose after the branch between humans and nonhuman primates.