Active transport is transport
a. in an energetically unfavorable direction always driven by hydrolysis of ATP.
b. in an energetically unfavorable direction always coupled to another reaction or source of energy.
c. in an energetically unfavorable direction driven only by the flow of another molecule across a membrane.
d. in an energetically favorable direction coupled to the hydrolysis of ATP.
Ans: b. in an energetically unfavorable direction always coupled to another reaction or source of energy.
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A. depending on their oxygen utilization pattern, organisms will grow differently on it. B. thioglycolate has a carbon-sulfur bond that many microbes cannot break enzymatically. C. it has multiple ingredients for a broad range of nutrients. D. both yeast extract and pancreatic digest of casein are not chemically defined.
Organisms producing beta-lactamase are usually susceptible to which beta-lactamase inhibitor?
A) Rifampin B) Penicillin C) Nalidixic Acid D) Clavulinic Acid
The largest blood vessel in the human body is the
A) superior vena cava. B) pulmonary vein. C) aorta. D) pulmonary artery.
Proteins in psychrophilic cells generally have ________ than proteins found in cells that grow optimally at higher temperatures
a. fewer ?-helices and more ?-sheets b. fewer hydrogen bonds c. more ?-helices and fewer ?-sheets d. more hydrogen bonds