Methanogens play an important role in sewage treatment.
Answer the following statement true (T) or false (F)
True
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Answer the following statements true (T) or false (F)
1. Photons from light can boost an electron to a higher energy state. 2. Harnessing light and splitting water occurs in both photosystem I and II. 3. The Calvin cycle is only capable of fixing carbon dioxide in the dark. 4. In hot and arid environments, plants that maximize photorespiration produce the most sugars.
One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree. The tree will typically survive that growing season, but will die over the winter. Why wouldn't girdling work on a large grass?
A. Monocots do not have vascular bundles. B. Eudicots do not have vascular bundles. C. Grasses have taproots. D. The vascular bundles are scattered throughout the ground tissue. E. The vascular bundles are in a ring just under the bark.
Transmitter substances
a. are expelled from the presynaptic cells by exocytosis. b. tend to destroy acetylcholine. c. enter the postsynaptic cell to continue the passage of the impulse. d. interact with membrane receptors of the postsynaptic cells. e. are expelled from the presynaptic cells by exocytosis and interact with membrane receptors of the postsynaptic cells.
In places where the public sanitation is poor, people run the risk of getting ____
a. West Nile virus b. cholera c. SARS d. anthrax e. mononucleosis