Which of the following organisms is part of the normal flora of the skin, nose, throat, and intestines of humans, and is also a leading cause of bacterial disease?
a. Propionibacterium acnes
b. Corynebacterium diphtheriae
c. Staphylococcus aureus
d. Staphylococcus epidermidis
c
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. Which biological process accounts for the oscillating pattern observed in this dataset?
A. photosynthesis B. respiration C. More information would be needed to answer this question.
Sea turtle social behavior is primarily:
a. small family groups. b. formation of hunting groups. c. solitary. d. schooling. e. harems.
All the following antimicrobial agents work by inhibiting protein synthesis except:
A) chloramphenicol. B) erythromycin. C) imipenem. D) tetracycline.
Which of the following it the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate d. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate e. seed coat splits ? water imbibition ? shoot cells divide and elongate ? root cells divide and elongate