The hole in the ozone layer is most dramatic over ____.
A. Antarctica
B. North America
C. Asia
D. Europe
E. Africa
Answer: A
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When comparing the actual number of genes, the organism with the highest number is
A. rice. B. human. C. fruit fly. D. yeast.
Xanthophyll is a pigment found in plants that helps protect the photosynthetic protein D 1 from:
A. water reactions B. chlorophyll C. damage by high temperatures D. damage by excess light energy E. membranes
What has been a consequence of the disease caused by the chytrid Batrachochytrium dendrobatidis?
a. the extinction of many species of frogs b. the killing of trees in temperate forests c. sexual transmission in humans d. the killing of millions of humans each year
Myocardial infarction, also called a heart attack,
A) is caused by excessive blood pressure in the heart. B) actually causes no permanent damage to the heart. C) is unrelated to cigarette smoking. D) is the damage or death of cardiac muscle tissue.