The percentage of different colored water boatmen eaten by fish were graphed relative to the frequency of that color in the population. Based on the graph, a population of water boatmen would ________
A. lose rare genotypes.
B. increase in size.
C. increase in rare genotypes.
D. have no variation in genotype frequencies.
E. decrease in genetic variability.
Answer: C
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If it were found that all animals except the Parazoa had a particular set of genes, one could conclude
A. that those genes are not useful in interpreting phylogeny. B. that Darwin was incorrect in his idea about descent with modification. C. that the Parazoa are not animals. D. that those genes probably are related to the embryonic formation of tissues. E. that those genes are related to cell wall formation.
The difference between diffusion and passive transport is that during diffusion molecules move ________ and in passive transport they move ________
a. through passive transporters / across the lipid bilayer b. down concentration gradients / up concentration gradients c. through active transporters / through passive transporters d. across the lipid bilayer / through passive transporters
The appearance of gram-negative bacteria after addition of the decolorizing agent in the Gram stain.
a. Purple b. Red c. Colorless d. Brown
An organism that produces catalase enzyme is protected from the harmful effects of
A) singlet oxygen (1O2). B) hydroxyl radical (HO.). C) peroxide anion (O22-). D) superoxide radical (O2-). E) molecular oxygen (O2).