Alexander Fleming discovered the compound penicillin in 1928 after his observations on the antibacterial effects of the mold Penicillium chrysogenum on which of the following microbes?
A) Staphylococcus aureus
B) Escherichia coli
C) Saccharomyces cerevisiae
D) Salmonella enterica
A) Staphylococcus aureus
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The combined function of the malleus, incus, and stapes is to ____
a. convert the mechanical vibration of the tympanic membrane into a pressure wave in the cochlear duct b. amplify the vibrations of the ear drum c. equalize the pressure on both sides of the tympanic membrane d. convert the oval window's vibrations into vibrations of the tympanic membrane e. dampen the vibrations of the tympanic membrane
Which of the following statements about bird
song is false? a. It is an instinctive behavior. b. The bird nervous system is prewired to recognize the species song. c. A sparrow that is not tutored early in his life can learn the correct song as an adult. d. Rendition of the species song is influenced by acoustic input during a sensitive period. e. All of these are true
If heat energy is absorbed by the system during a chemical reaction, the reaction is said to be:
A) at equilibrium. B) endergonic. C) endothermic. D) exergonic. E) exothermic
One of the ways smooth endoplasmic reticulum (ER) differs from rough endoplasmic reticulum is that rough ER is covered by
a. the extracellular matrix. b. the Golgi apparatus. c. ribosomes. d. the cytoskeleton. e. mitochondria.