Efflux pumps can be used to pump antibiotics out of a cell once they enter to protect the cell. This will be done against the concentration gradient of the antibiotic. Which of the active transports would most likely be used?
a. Symport
b. Antiport
c. Uniport
Answer: c. Uniport
Biology & Microbiology
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Which of the following scientists demonstrated
for the first time that molecules of life could have come from nonliving entities (gases, water, and spark discharge)?
a. Crick and Orgel b. Wallace c. Miller and Urey d. Chargaff e. Cuvier and Lyell
Biology & Microbiology
Which of the following is NOT dependent on the
others as a source of food? a. carnivores b. herbivores c. producers d. detritivores e. decomposers
Biology & Microbiology
During mitosis, the rate of microtubule turnover
a. decreases. b. stays the same. c. doubles. d. increases five- to tenfold.
Biology & Microbiology
The structural and functional unit of nervous tissue is the
A) dendrite. B) axon. C) neuron. D) nerve.
Biology & Microbiology