Which morphological trait evolved more than once in animals, according to the phylogeny based on DNA sequence data found in the figure above?
A) coelom
B) bilateral symmetry
C) segmentation
D) tissue
E) protostome development
Answer: C
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All of the following are contributing to the current imbalance of the carbon cycle
a. deforestation b. photosynthesis c. burning of fossil fuels d. ALL of the above are contributing to the current imbalance of the carbon cycle
Which of the conditions necessary to maintain
genetic equilibrium is the least likely to occur in a natural population?
a. no mutations b. an infinitely large population c. a population isolated from other populations d. random mating e. all individuals producing the same number of offspring
Abscission can affect
a. leaves. b. fruits. c. flowers. d. all of these. e. none of these
Caffeine is an inhibitor of phosphodiesterase. Therefore, the cells of a person who has recently consumed coffee would have increased levels of _____
A) phosphorylated proteins B) cAMP C) adenylyl cyclase D) activated G proteins