Restriction enzymes were originally isolated from bacteria, which used them to protect themselves from viruses. How might a restriction enzyme defeat a virus?
What will be an ideal response?
Viruses infect cells by inserting their DNA into the cell where they are expressed. Restriction enzymes cut up DNA at specific sequences and could therefore cut up the viral DNA before it could be translated and transcribed.
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One reason angiosperms are more successful than gymnosperms is because gymnosperms lack _____
a. seeds b. megaspores c. fruits d. leaves e. wood
Anemia refers to ____
a. too many or abnormal red blood cells b. too few or abnormal white blood cells c. too few or abnormal red blood cells d. too many or abnormal white blood cells e. a form of leukemia
The ability to maintain a constant internal environment is
a. metabolism. b. homeostasis. c. development. d. physiology. e. thermoregulation.
Which of the following would most likely diffuse across a synapse?
a. insulin b. NO c. histamine d. acetylcholine e. prostaglandins