A plant pathologist, a scientist who studies plant diseases, examines a tree that has burnt leaves, is mineral deficient,
and has several diseases. The plant pathologist concludes the tree’s symptoms are most likely the direct result of ____.
a. biological magnification
b. desertification
c. ozone depletion
d. acid rain
e. deforestation
ANSWER: d
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The air pressure in Denver, Colorado, is about 83% of the air pressure in Miami Beach, which is at about sea level. Given that the air pressure in Miami Beach is 760 mm Hg and oxygen makes up 21% of the air in Miami Beach,
what are the percentage of oxygen and the partial pressure of oxygen in Denver, respectively? A) 21%; 21 mm Hg B) 21%; 132 mm Hg C) 17.4%; 132 mm Hg D) 17.4%; 21 mm Hg
Several fluorogenic dyes can be used simultaneously in a sample as long as they each emit light at a different measurable wavelength
Indicate whether the statement is true or false.
A person sensitive to bee stings may die minutes after a sting due to
a. a collapse of the immune system. b. a clogging of the capillaries. c. a release of excessive fluids from the capillary beds. d. respiratory distress caused by excessive mucus. e. the extremely sharp rise in blood pressure.
Which part of HIV facilitates attachment of HIV to TH cells?
A. Integrase B. Fusion promoter C. GP-120 D. Protease E. Capsid proteins