A researcher tests the hypothesis that large, daily doses of vitamin C help protect against catching the common cold. What would be the best experimental and control group to test this hypothesis?
A. Experimental group: takes a large dose of vitamin C daily;
Control group: takes nothing.
B. Experimental group: people with a cold are administered vitamin C daily;
Control group: people without a cold are not administered vitamin C.
C. Experimental group: takes a large dose of vitamin C daily;
Control group: takes a large weekly dose of vitamin C.
D. Experimental group: takes a large, daily dose of vitamin C; Control group: takes a daily dose of a sugar pill disguised as vitamin C.
D. Experimental group: takes a large, daily dose of vitamin C; Control group: takes a daily dose of a sugar pill disguised as vitamin C.
You might also like to view...
What are the three basic steps of transcription?
What will be an ideal response?
How is a plant embryo formed?
What will be an ideal response?
Which statement is true of mitochondria?
a. Mitochondria are found only in prokaryotic cells. b. ATP is formed by reactions that convert carbon dioxide and water into sugars. c. ATP-producing reactions take place in the outer compartment. d. Mitochondria possess their own DNA. e. ATP producing reactions do not require oxygen.
Mitosis is essential for
A) growth of an organisms B) repair of injured tissue C) formation of gametes D) replacement of worn-out cells E) A, B, D are true