Which of the following correctly describes the interactions between antigens, class II MHC molecules and T cells?
A) Antigens bound to class II MHC molecules and interact with helper T cells
B) Antigens bound to class II MHC molecules and interact with killer T cells
C) both a and b
D) neither a nor b
A
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The most important reason why summers in the Southern Hemisphere are not warmer than summers in the Northern Hemisphere is that
a. ?Earth is closer to the Sun in January. b. ?Earth is farther from the Sun in July. c. ?over 80 percent of the Southern Hemisphere is covered with water. d. ?the Sun's energy is less intense in the Southern Hemisphere. e. ?ice from Antarctica prevents it from getting very hot.
Read carefully through the following sentence and decide which of the options is correct: In
industrialized countries, personal perspectives of environmental issues are realistic because environmental problems develop close to home as resources are collected and used locally. a. The word "realistic" should be replaced by "warped." b. The word "industrialized" should be replaced by "developing." c. The word "resources" should be replaced by "wastes." d. The word "environmental" should be replaced by "geological." e. The word "home" should be replaced by "rivers."
The group of marine mammals that are named because of their fanciful resemblance to mermaids is order Carnivora
Indicate whether the statement is true or false
Quartz forms at a lower temperature than olivine
Indicate whether the statement is true or false