The ____ contain Gram-positive and Gram-negative species
a. Archaea
b. Bacteria
c. Archaea and Bacteria
d. extremophiles
e. methanogens
ANSWER: c
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Which of the following is suggested by the fact that all eukaryotes have either functional mitochondria or mitochondria-like organelles?
a. Mitochondria evolved before plastids. b. Plastids evolved before mitochondria. c. Mitochondria and plastids are both chloroplasts. d. Chloroplasts are related to mitochondria but not plastids.
Mammalian red blood cells:a
are phagocytic. b. contain a lobed nucleus. c. have a one-day lifespan. d. are produced in the liver. e. are produced in response to erythropoietin
GPCRs are receptor proteins found in the plasma membrane that are important for cellular communication. What cellular structure makes GPCRs?
A) the smooth endoplasmic reticulum B) the rough endoplasmic reticulum C) Golgi apparatus D) mitochondria
Which of the following factors does not affect the efficiency of a germicide?
A) how the object is used B) what infectious agents are most likely present C) the number of microbes to be killed D) the presence of excessive organic substances like blood, soil, or fecal matter E) the presence of excessive inorganic substances like minerals and salts in hard water