Explain how a vaccine works.
What will be an ideal response?
Vaccines protect us from disease by making use of the acquired immune system's "memory" for pathogens it has encountered in the past. Vaccines expose the body to antigens of a particular pathogen, but do so without introducing the pathogen itself. Most vaccines contain either dead or very weak strains of the pathogen, or use only a part of the pathogen-perhaps a bacteria's flagellum or part of its cell wall. The acquired immune system then responds to antigens in the vaccine the same way it would respond to the real pathogen-by making antibodies and the associated memory cells. The next time the pathogen is encountered, the acquired immune system is ready.
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Acid deposition can affect forests by
a. Leaching out essential plant nutrients b. Diminishing the supply of Oxygen available to the tree c. Releasing ions that are toxic to the trees d. A and B are correct e. A and C are correct
Near-infrared radiation represents what proportion of the total energy emitted by the sun?
A) 1/10 B) 1/4 C) 1/2 D) 3/4
Polar bears are ________.
A. hunted by native peoples B. managed by international agreement C. top predators of Arctic marine food chains D. protected by the U.S. Marine Mammal Act E. All of these are correct.
Plants can reduce the risk of flooding by consuming water, keeping soil loose and permeable and slowing surface runoff.
Answer the following statement true (T) or false (F)