Your aim is to sterilize prosthetic devices like heart valves and artificial joint structures before being used in the patient. Considering where they will be placed and the probable composition of the devices, what would be the best chemical to use?
A. Iodine
B. Bleach
C. Crystal violet dye
D. Quaternary ammonium compounds
Answer: D
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During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings
One student answered that sensory receptors had fired and triggered a neuronal reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which statement best describes these explanations? A) The first explanation is correct, but the second is incorrect. B) The first explanation refers to proximate causation, whereas the second refers to ultimate causation. C) The first explanation is biological, whereas the second is philosophical. D) The first explanation is testable as a scientific hypothesis, whereas the second is not. E) Both explanations are reasonable and simply represent a difference of opinion.
Changes in temperature and pH can decrease an enzymes activity by breaking ________.
A. chemical bonds. B. covalent bonds. C. ionic bonds. D. hydrogen bonds. E. none of the above is correct.
True or false: most of the fluid in the body is located within the extracellular compartment
a. true b. false
Sexual dimorphism has arisen as a result of
a. stabilizing selection. b. heterozygote superiority. c. kin selection. d. sexual selection. e. directional selection.