Which of the following countries has the
smallest ecological footprint?
a. Mexico
b. China
c. United States
d. India
e. Canada
D
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Deciduous trees in North America are dormant during winter months because ____
a. they receive no precipitation during winter b. photosynthesis cannot occur during winter c. this offers a way to survive the extended drought-like conditions d. the cold temperatures would otherwise damage leaves and buds e. they have no leaves during winter months
The DNA polymerase proofreading mechanism maintains a low mutation rate in eukaryotic genes
Indicate whether the statement is true or false
Because steroid hormones are lipid soluble, they
A) dissolve easily in water. B) must bind to receptor proteins on the surface of the plasma membrane. C) only affect muscle cells with high lipid content. D) are repelled by the plasma membrane. E) can pass through the plasma membrane.
What is the best way to protect the population against Haemophilus influenza type b infections?
A) Since the chances of complications are rare, no treatment is required. B) antibiotic treatment after onset of symptoms C) antitoxin treatment when exposure has occurred D) use of the Hib vaccine in young children E) IV fluids are commonly prescribed due to loss of fluids.