A microbe recovered from an environmental sample grows on a medium composed of agar and a mix of salts. The agar is not digested during incubation. The growth rate increases in high CO2 conditions. The organism is likely a(n)
A) autotroph.
B) halophile.
C) heterotroph.
D) chemotroph.
E) The answer cannot be determined from the information provided.
Answer: A) autotroph.
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Microtubules grow from a barrel-shaped organelle called the ____, which remains below the finished array as a ____
a. cilium; motor protein b. cell cortex; centriole c. microfilament; basal body d. centriole; intermediate filament e. centriole; basal body
Complement-fixing antibodies are those that function by:
a. attaching to the surface of pathogens and contributing to their destruction by the lytic action of complement. b. binding to and blocking surface receptors for host cells. c. attaching to the surface of pathogens and making the pathogens more amenable to ingestion by phagocytic cells. d. attaching to the surface of pathogens and contributing to their destruction by che-motaxis.
Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because ________.
A. humans do not use folic acid B. humans synthesize folic acid by a process that is not sensitive to sulfonamides C. humans do not synthesize folic acid but obtain it in their diets D. None of the choices are correct.
When one molecule of glucose is completely oxidized in aerobic respiration, the net amount of ATP
produced is: a. 2 b. 4 c. 22 d. 34 to 36 e. 36 to 38.