All blood cells originate from the
A. erythrocyte.
B. leukocytic stem cell.
C. eosinophilic stem cell.
D. hematopoietic stem cell.
D
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In June 2001 an announcement was made that a draft sequence of the ____________________ nucleotides in the human genome had been finished
a. 350 million b. 990 million c. 1.1 billion d. 3.2 billion e. 56 billion
Which component of a negative feedback mechanism is responsible for producing the result that counteracts the original environmental change away from homeostasis?
a. an integrator b. a sensor c. an effector d. a stimulus
Which of the following domains contains organisms that are adapted to life in harsh environments?
(a). Domain Archaea (b). Domain Bacteria (c). Domain Eukarya (d). Domain Animalia (e). Domain Plantae
Alcohol acts as a surfactant and a protein coagulant. Which of the following statements are true concerning its mechanism of action?
A. 100% ethanol is a better microbicide than lower concentrations since the more concentrated it is, the more effective the activity. B. 70% ethanol is a better microbicide than 100% alcohol since water molecules are necessary to coagulate proteins. C. Ethanol is a better microbicide than isopropyl alcohol. D. Despite not killing endospores, ethanol is still considered a sterilizing agent.