Auxins primarily flow downward in shoots and roots and this transport is called:
A. bipolar
B. polar
C. nonpolar
D. tripolar
E. dipolar
B. polar
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Match the following items to the correct phrase.
_______1. Viruses that infect bacteria and cause the lytic cycle to occur. _______2. Term meaning complete viral particles. _______3. Are known to cause some plant diseases, but no animal diseases. _______4. Infectious protein molecules. _______5. Infectious molecules of RNA. _______6. Cause diseases such as Creutzfeldt-Jacob disease, “mad cow disease,” and “scrapie.” a. viroids b. virions c. prions d. temperate phages e. virulent phages
Sponges have a bone-like support system of spicules that are made up of which of the following materials?
a. calcium and hydrogen b. cellulose and silica c. calcium carbonate or silica d. chitin or calcium carbonate
Why must T cell activation take place outside the thymus?
A. An activated T cell could destroy the other maturing T cells. B. An activated T cell could then destroy the thymus gland itself. C. Many T cells are self-reactive and must be eliminated in the thymus before any possibility of activation. D. Other cell types might be accidentally activated in the thymus.
Los Angeles, California, has an average daily temperature between 70°F and 80°F for most of the year. There's very little rainfall except during a rainy season beginning in the fall. What does this describe about the city's conditions?
A) climate B) weather C) biome D) ecosystem