Which of the following is true of adhesion molecules?
A) They are covalently bound to the T-cell receptor
B) They help bind an antigen to the T-cell receptor
C) both a nor b
D) neither a nor b
B
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Which statement most accurately describes the population control efforts in China?
A) Changing public attitudes about family size through communication, education, counseling, and contraceptives can reduce the population growth rates. B) There is minimal governmental financial support for birth control for all couples. C) Increasing child survival, elevating status and employment levels for women, and increasing literacy in the general population will decrease fertility rates. D) A one-child policy that is enforced through taxation and penalties works best for controlling population. E) A one-child policy that requires all women to work and education for all decreases fertility rates.
Total year-round precipitation for humid subtropical locations usually exceeds that for the seasonally wet Mediterranean locations
a. True b. False Indicate whether the statement is true or false
________ have resulted in mass coral bleaching and ocean acidification (due to absorption of excess CO2), which destroy the coral in the Great Barrier Reef
A) Too many divers and tourists B) Rising sea temperatures C) Bleach spilled from tankers off Australia's coast D) Oil spilled from tankers in the Coral Sea
Which of the following is an example of recycling?
a. collecting and remelting aluminum beer cans and making them into new cans b. cleaning and refilling soft-drink bottles c. selling used clothing at a garage sale d. saving leftovers in a peanut butter jar e. using household water to water a garden