A transplantation patient suffers an organ rejection within hours after the procedure. What type of rejection occurred?
A. Hyperacute
B. Acute
C. Chronic
D. Graft-versus-host disease
Ans: A. Hyperacute
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In your biology lab, you are given a vial that contains fish urine. Your assignment is to predict whether the urine came from a fresh- or salt-water species. You discover that the urine contains a high concentration of salts. What is your prediction for the fish's habitat? What is the concentration of solutes in the fish relative to its environment?
A. Freshwater, hypoosmotic B. Freshwater, hyperosmotic C. Marine, hypoosmotic D. Marine, hyperosmotic
Answer the question using the accompanying figure. In the internal leaf structure, the item labeled "5" is ____
a. a vascular bundle b. spongy mesophyll c. epidermis d. a stoma e. palisade mesophyll
Which of the following statements concerning HIV infection is false?
1.HIV infects cells in the immune system. 2.HIV uses reverse transcriptase to copy its genome. 3.HIV becomes a provirus. 4.HIV never produces viral particles. 5.HIV can infect other cells in the immune system for years.
Compounds that inhibit receptors by preventing the natural messenger from binding are known as
A) agonists. B) arrestins. C) sildenafils. D) syndecans. E) antagonists.