Which of the following may be used as sources of energy by chemolithotrophs?
A. Hydrogen gas
B. Reduced sulfur compounds
C. Reduced nitrogen compounds
D. All of the choices are correct.
Answer: D
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Upwelling
a. increases productivity by bringing nutrient-rich cool water to the surface of the ocean. b. occurs in cold northern oceans. c. refers to the accumulation of pollution in the North Pacific Ocean. d. occurs when warm ocean currents approach the edge of continents. e. generates the major climatic changes in the Pacific Ocean known as El Niño.
Answer the following questions true (T) or false (F)
1. An organism's genotype influences its phenotype. 2. Gyrase breaks the hydrogen bonds between DNA strands and unwinds the DNA strands while topoisomerases relieve the coiling tension that develops as the helix unwinds. 3. DNA replication is a semiconservative process.
The most specific term usually used to describe a substance in a biological system that increases the rate of a reaction without being permanently changed by the reaction is a(n) ________.
A. enzyme B. rate increaser C. catalyzer D. reductant
Collagen fibers are characteristic of which tissue?
a. muscle b. epithelial c. connective d. nervous e. embryonic