What was the first substance produced by microorganisms to be used pharmaceutically?
A) penicillin
B) streptokinase
C) phenylalanine
D) rennin
E) erythromycin
A
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Rabbits introduced to Australia overpopulated because in their new habitat, ____
a. people rarely hunted them b. they had no natural diseases c. they had no natural predators d. their food supply was larger e. there were few herbivorous competitors
What is the half-life of an element?
a. The distance from the atomic nucleus to where 50 percent of its electrons can be found b. Half of the length of time required for an element to completely decay into another element c. The period of time required for 50 percent of an element to decay into another element d. The quantity of an element sufficient to kill half of the organisms to which it is exposed
Fiber in your eye are ____ when you are looking at something close.
Fill in the blank(s) with the appropriate word(s).
Individuals with the disorder xeroderma pigmentosum are hypersensitive to sunlight. This occurs because their cells cannot_____
A) replicate DNA B) undergo mitosis C) exchange DNA with other cells D) repair thymine dimers