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

Biology & Microbiology

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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

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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.

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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.

Biology & Microbiology

Which part of HIV facilitates attachment of HIV to TH cells?

A. Integrase B. Fusion promoter C. GP-120 D. Protease E. Capsid proteins

Biology & Microbiology