A major organism involved in associative nitrogen fixation in the rhizosphere of many plants is ________.
A. Rhizobium
B. Frankia
C. Azospirillum
D. Pseudomonas
Answer: C
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How are trypanosome diseases similar to malaria?
A) They are transmitted by insect vectors. B) They cause intermittent fevers. C) They are acute, self-limiting diseases. D) They are all endemic to Africa.
Which of the following is not considered a macronutrient?
A. Cobalt (Co) B. Calcium (Ca) C. Potassium (K) D. Carbon (C)
All of the following protect the skin and mucous membranes from infection EXCEPT
A) multiple layers of cells. B) tears. C) saliva. D) HCl. E) the "ciliary escalator."
Which of the following statements is correct?
A. Asexual reproduction requires the production of eggs and sperm. B. The sperm and egg have twice as many chromosomes as the parental cells. C. Geneticists use the terms "son" and "daughter" to distinguish between cells resulting from cell division. D. Meiosis results in gametes that are used in reproduction.