________ 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 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
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