What is the purpose of double-blind experiments?
A) to ensure that the hypothesis is scientifically testable
B) to see if the experimental group responds differently than the control group
C) to help the subjects in an experiment understand the treatment they are receiving
D) to minimize the effects of human bias on the results
D
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If a DNA fragment is 21,000 bp long, about how many DNA fragments would result after incubation with EcoRI?
A. 3 B. 5 C. 10 D. 20 E. 100
Four of the five answers listed below are
produced by the same germ layer. Select the EXCEPTION.
a. nervous system b. muscle system c. circulatory system d. reproductive system e. excretory system
Cocklebur will not flower if exposed to 8 hours of dark and 16 hours of light. It will flower if exposed to 16 hours of dark and 8 hours of light. However, if the 16 hours of dark is interrupted with a brief period of light, the cocklebur will not flower. Which of the following will trigger cocklebur to flower?
A. short dark periods B. short light periods C. long dark periods D. None of the answer choices is correct. E. long light periods
Some bacteria attach to surfaces of other cells with short outgrowths called ________.
Fill in the blank(s) with the appropriate word(s).