Why are mycorrhizal fungi superior to plants at acquiring mineral nutrition from the soil?
A) Hyphae are one hundred to one thousand times larger than plant roots.
B) Hyphae have a smaller surface-area-to-volume ratio than do the hairs on a plant root.
C) Mycelia are able to grow in the direction of food.
D) Fungi secrete extracellular enzymes that can break down large molecules.
Answer: D
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Which of the following is true about the role normal microbiota plays in maintaining host health?
A. They provide a surface that is incompatible for attachment of an invader. B. They establish competition for nutrients and vitamins. C. They produce antimicrobial substances. D. They stimulate the immune system. E. All of the choices are true.
What is the result of crossing over?
a. mutation b. sex selection c. recombination d. gene linkage
Which amoebozoan spends most of their life cycle as a multinucleated mass that streams along surfaces, feeding on microbes and organic matter?
a. all slime molds b. cellular slime molds c. plasmodial slime molds d. amoebas e. spore-bearing fruiting bodies
Which of the following would have the smallest number of hydrogen ions (H+)?
A. A solution with the pH 2 B. A solution with the pH 6 C. A container of acetic acid (vinegar) D. A container of a strong base