Penicillin was discovered by ____________ and was isolated by ________ .
A) Gerhard Domagk; Alexander Fleming
B) Selman Walksman; Ernest Fourneau and Paul Erhlich
C) Ernst Chain and Howard Florey; Paul Erhlich
D) Alexander Fleming; Ernst Chain and Howard Florey
Ans: D) Alexander Fleming; Ernst Chain and Howard Florey
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When plants bend toward or away from a light source, what is this called and which type of light causes the response?
a. phytochromism, far red light b. photoperiodism, red light c. phototropism, blue light d. photosynthism, both red and blue light
An organism that cannot tolerate an oxygen environment is a(n) ________.
A. microaerophile B. obligate anaerobe C. aerobe D. facultative anaerobe E. obligate aerobe
Which is a heart?
a) the structure that is the location for gas exchange b) the muscle that pumps blood through the circulatory system c) the organ that controls all of the other organs in the body d) the organ that breaks down food molecules to obtain energy
What type of symbiotic relationship is exemplified by athlete's foot?
A. Mutualism B. Parasitism C. Atavism D. Commensalism