Blood cell development occurs in the bone marrow of mammals during the process of ________.
A. hematopoesis
B. hemostasis
C. hemolysis
D. homeostasis
Answer: A
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Which of the following influence(s) the efficiency of an antimicrobial agent?
A. temperature B. duration of exposure C. concentration of the agent D. All of the choices are correct.
Which reservoir holds the largest volume of Earth’s water?
a. groundwater b. rivers c. lakes d. atmosphere e. polar ice
The backbone of DNA consists of ________
A) nitrogenous bases B) a repeating sugar-nucleotide-sugar-nucleotide pattern C) a repeating sugar-phosphate-sugar-phosphate pattern D) paired nucleotides
The bacterial A-B toxins often consist of a two-chain molecule. The 'B chain' promotes entry of the bacteria into cells, and the 'A chain' has inhibitory activity against some vital function.
a. true b. false