___ are a type of internal signal molecule used in controlling the cell cycle.
Fill in the blank(s) with the appropriate word(s).
Answer: Kinases
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For the process of diffusion to occur, molecules must
A. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached. B. move from areas of low concentration to areas of higher concentration until an equilibrium is reached. C. remain stationary until their molecular motion allows for an equilibrium to be reached. D. move from areas of high concentration to areas of lesser concentration until facilitated transport can assist the molecular equilibrium. E. move from areas of high concentration to areas of lesser concentration until an equilibrium is reached by active transport.
Which cells are found in lymph nodes to clear away bacteria and other unwanted substances?
a. T cells b. B cells c. dendritic cells d. macrophages e. platelets
Poliovirus initially multiplies in the ________.
A. nasopharynx B. intestine C. central nervous system D. lymphoid tissue E. basal ganglia
A 67-year-old diabetic man develops intense pain and swelling on his calf, which acquires a bronze discoloration and develops significant tissue necrosis with hemorrhagic bullae and gas production (gas gangarene). Which of the following is the important contributing agent?
A. Clostridium perfringens B. Clostridium difficile C. Clostridium botulinum D. Clostridium tetani