Which of the following environments would be most
likely to produce trees without annual rings?
a. tropical rain forest
b. northern evergreen forest
c. areas with alternating wet and dry seasons
d. temperate-deciduous forests
e. none of these, because annual rings are
characteristic of all trees
Answer: a
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Which relationship is MOST likely to be observed between species of different classes?
A) A deltaproteobacterium oxidizes hydrogen sulfide into sulfate, which is then reduced by an epsilonproteobacterium. B) An epsilonbacterium oxidizes the hydrogen sulfide produced by a sulfur-reducing deltaproteobacterium. C) A sulfate-reducing epsilonbacterium produces sulfite, which a deltaproteobacterium reduces to hydrogen sulfide. D) Syntrophic metabolism of sulfur by a deltaproteobacterium and an epsilonproteobacterium occurs.
Which of the following is a lipid-derived hormone?
a. thyroxine b. human growth hormone c. estradiol d. insulin
You make a phospholipid bilayer with short, saturated hydrocarbon tails. You measure the permeability of this membrane to oxygen. You then double the length of the hydrocarbon tails and remeasure membrane permeability. You then double the length of the hydrocarbon tails again and make a third measurement of membrane permeability. You graph membrane permeability as a function of hydrocarbon tail length. Which of the accompanying graphs best represents the data you expect?
a.) Horizontal line b.) Positive slope c.) Bell shape d.) Negative slope
Which new technology has advanced our understanding of large scale ocean features such as ocean currents?
A) Marine labs B) ROVs C) AUVs D) Remote sensing