________ normally prevent mitosis and are activated by DNA damage to stop cell division.
A. Oncogenes
B. Protooncogenes
C. Tumor suppressor genes
D. Growth factors
E. Mutagens
Answer: C
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Under which of the following conditions would T-cell activation be LEAST likely to occur?
A. Macrophages are incubated with antigen, then fixed with paraformaldehyde, then incubated with antigen-specific T cells. B. Macrophages are fixed with paraformaldehyde, then incubated with antigen, then incubated with antigen-specific T cells. C. Macrophages are fixed with paraformaldehyde, then incubated with digested antigen, then incubated with antigen-specific T cells. D. Macrophages are incubated with digested antigen, then fixed with paraformaldehyde, then incubated with antigen-specific T cells. E. Macrophages are incubated with antigen and then incubated with antigen-specific T cells.
What is the anatomical name for the big toe?
A. pollicis B. digiti minimi C. hallux D. digiti maximi
The danger associated with a ruptured spleen is its ability to:
A. Twist the abdominal wall and then restrict the supply of blood to the pelvic cavity B. Splint itself and then produce a delayed hemorrhage C. Cause a hematoma to develop under the fascial tissue surrounding the rectus abdominis muscle D. Produce a transitory paralysis of the diaphragm
What are zeitgebers (German for "time-givers")? Choose the correct option
A) Cellular mechanisms that serve as internal biological clocks B) Free running biological clocks C) Environmental cues that help biological clocks become entrained to the 12-hour day-night cycle and the 24-hour day D) Fluctuations in physiological functions with circadian rhythms