"Humans have two options for limiting population growth: We can make a global effort to limit our
own population, or we can wait until the environment does it for us." Briefly address each scenario.
What methods would result in a successful global decline in birthrate? What environmental events are
the alternatives?
What will be an ideal response?
Government-sponsored family planning programs have had great success both in reducing birth rates,
and in improving the health and status of women. Providing medical care in conjunction with such
programs encourages families to have fewer children. In places with high child mortality rates, family
sizes are high. Environmental events that will bring about an uncontrolled decline in population
include war, famine, drought, and exposure to accumulating toxins.
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The two strands of the DNA double helix are held together by
A) 5' to 3' attraction. B) hydrogen bonds between nucleotide bases. C) codons. D) peptide bonds between nucleotide bases.
Burning of carbon-based fuels can produce which one of the following, an odorless gas that competes with oxygen for binding to hemoglobin.
A) carbon monoxide. B) hydrogen peroxide. C) sulfuric acid. D) methane.
The outer part of the enzyme linked receptor has a binding site for a signaling molecule, and the part of
the receptor that extends into the cytosol has a binding site for a specific G protein. __________________ Indicate whether the statement is true or false.
Select the best definition of contraceptives.