Which of the following is true of nitrogen?
A. N2 is scarce in the atmosphere, therefore, plants must obtain other sources of nitrogen.
B. Animals require nitrogen from the food they eat for the synthesis of carbohydrates and lipids.
C. Nitrogen-fixing bacteria convert N2 into compounds plants can utilize.
D. Nitrogen is plant food and, therefore, provides plants with energy.
C. Nitrogen-fixing bacteria convert N2 into compounds plants can utilize.
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Which of the following is classified as a flatworm?
a. trematodes b. polyps c. medusa d. rotifers
Which of the following structures contain
oxygen-poor blood?
a. left ventricle b. left atrium c. aorta d. pulmonary arteries e. pulmonary veins
The ability to extract oxygen from the environment and use it to make energy is called
A) photosynthesis. B) comparative biochemistry. C) anaerobic metabolism. D) self-replication. E) aerobic metabolism.
A strain of Neisseria gonorrhea has a mutation which has caused it to lose the ability to produce fimbriae and become less virulent as a consequence. What function has this pathogen lost?
A) the ability to adhere to cells of the body B) the ability to move from one location in the body to another C) the ability to produce an endotoxin D) the ability to establish a latent infection E) the ability to prevent phagocytes killing it