During replication, which enzyme unwinds the two strands of the DNA molecule from one another?
A. Helicases
B. Ligases
C. Unwindases
D. Primases
Answer: A
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A certain species of flea drinks only the blood of elephants. How would you best describe this flea's trophic level?
A) producer B) primary consumer C) secondary consumer D) decomposer
The function of which of the following organelles directly requires oxygen?
A. Ribosome B. Mitochondrion C. Nucleus D. Centriole E. Golgi apparatus
Why is snail fever a common name for infections with Schistosoma?
A) The worms look like snails. B) They are contracted by eating snails. C) Snails are the intermediate host. D) Physical contact with snails may result in infection. E) The larval stage looks like a snail.
Answer the following questions true (T) or false (F)
1. Except for the period during which the bubonic plague occurred, the human population demonstrated logistic growth from the Middle Ages until about 50 years ago. 2. The total fertility rate is defined as the average number of children born to each woman in a population. 3. Per capita use of resources and CO2 emissions may be just as important as population size when considering stress to the global environment.