Changes in what are the basis for microevolution?
a. genes
b. behavior
c. physiology
d. mitosis
e. phenotypes
ANSWER: a
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The main reason certain seeds germinate when brought to the soil surface, when the soil is disturbed, might be because:
A. They need additional oxygen. B. They are then more aware of their surroundings. C. They require light to germinate. D. They have water deprivation. E. They are sensitive to the cold temperatures of the soil.
Biologists believe that whooping cranes suffer from a high rate of developmental deformities of the spine and trachea
because of ____.
a. biological magnification of DDT b. exposure to hormone-mimicking pollutants from plastics c. a population bottleneck and loss of genetic variability d. conservation biologists saving chicks that would have died at hatching e. exposure to PCBs used as insulators in electronics
Ricin is toxic because it
a. binds to eukaryotic DNA. b. binds to eukaryotic mRNA. c. blocks food from entering the cell. d. inactivates ribosomes. e. binds to nerve tissue and causes paralysis.
The first commercial product made with recombinant DNA techniques was ____________________. Fill in the blank(s) with the appropriate word(s)