Nitrogen-fixing bacteria convert atmospheric nitrogen (N2 gas) into ammonium (NH4). Why is this conversion important for life on Earth?
A. Nitrogen gas is toxic.
B. Ammonium is an important cleaning agent.
C. Nitrogen gas leads to global warming.
D. Ammonium is a very important plant nutrient.
Answer: D
You might also like to view...
Which of the following allows water to move much faster across cell membranes?
A) the sodium-potassium pump B) ATP C) peripheral proteins D) aquaporins
Tetrads fail to separate correctly during anaphase in this process.
a. Crossing-over b. Inversion c. Translocation d. Nondisjunction e. Deletion
Which of the following concepts of community organization suggests that a community is merely a fortuitous association of species whose adaptations and requirements enable them to live together under the physical and biological conditions of a particular place?
A) holistic concept B) individualistic concept C) neither of the above
Which of hte following would be a position held by someone that believed in the punctuated equilibrium theory?
a. Most evolutionary change occurs during relatively short times of dramatic change or enviromental challenges. b. There is a continuous slow gradual change from one species to another species c. One should expect to find many transitional fossils left by organisms in the process of forming a new species d. Natural selection plays a very minor role in the mechanism of evolution e. Given nough time, most existing species will gradually evolve into mew species