Thomas Malthus proposed that
a. species gradually improved over generations because of an inherent drive toward perfection
b. humans reproduce beyond the capacity of their environment to sustain them.
c. the food supply and populations multiplied at the same rate.
d. artificial selection was the key to evolution.
e. natural selection was the key to evolution.
b
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Name the three yeast proteins required for the control of gene expression by galactose. What is the function of each?
What will be an ideal response?
If the F2 generation illustrates a lack of fitness, this is an example of
a. behavioral isolation. b. gametic isolation. c. hybrid breakdown. d. crossing over. e. hybrid sterility.
Which of the following is not true about the interaction of biofilms on teeth?
A) Brushing teeth twice daily and flossing will physically remove superficial plaque layers. B) Bacterial growth within deeper biofilm layers and new bacteria entering the mouth quickly reestablish what was removed from brushing. C) Limiting dietary fats reduces lactic acid production by the bacteria in dental plaque and decreases the risk for dental caries, D) When plaque calcifies into tartar it must be scraped off the teeth. E) Dentists recommend a twice-yearly dental cleaning and checkup to limit caries and periodontal disease,
If you were analyzing tree rings how might you distinguish between fires that occurred in the spring
versus fires that occurred in the summer, assuming the fires left fire scars?
What will be an ideal response?