The most economically useful unicellular fungi are
A. basidiomycetes.
B. actinomycetes.
C. yeasts.
D. mushrooms.
C. yeasts.
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Antigen presented within Type I MHC molecules will activate T________ cells, while antigens presented within Type II MHC molecules will activate T ________ cells.
A. cytotoxic; helper B. CD4+; CD8+ C. helper; cytotoxic D. regulatory; cytotoxic
Which of the following statements regarding diffusion is false?
A) Diffusion is a result of the thermal energy of atoms and molecules. B) Diffusion requires no input of energy into the system. C) Diffusion occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated. D) Diffusion occurs even after equilibrium is reached and no net change is apparent.
Which of the following plants are given credit for being the first plants to live on land?
a) liverworts b) Cooksonia c) club mosses d) Gnetum e) whisk ferns
The reduction of nitrogen gas to ammonia is called nitrogen (fixation/cycling/oxidation).
Fill in the blank(s) with the appropriate word(s).