Which of the following pairs is mismatched?
A) ionizing radiation — hydroxyl radicals
B) ozone — takes electrons from substances
C) plasma sterilization — free radicals
D) supercritical fluids — CO2
E) ultraviolet radiation — desiccation
E
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Which phylum is most closely related developmentally to the first vertebrates?
a. Echinodermata b. Arthropoda c. Mollusca d. Annelida e. Chelicerata
What is the highest possible frequency of recombination between linked genes that can be generated by any type of crossover event?
What will be an ideal response?
Which of the following most accurately describes selective permeability?
A) An input of energy is required for transport. B) Lipid-soluble molecules pass through a membrane. C) There must be a concentration gradient for molecules to pass through a membrane. D) Only certain molecules can cross a cell membrane.
Which factor is fundamentally responsible for the character of arctic tundra soils?
A) secretion of acid by lichens and plant roots B) permafrost C) warm, wet summers D) abundant winter snow