The standard error tells
A. how often the examiner made an error.
B. how often the experimental variable was tested.
C. how uncertain a particular value is.
D. the relationship between the control and test groups.
E. whether or not the research has been published in a scientific journal.
Answer: C
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Sensory receptors found in the ear are
(a) chemoreceptors. (b) mechanoreceptors. (c) photoreceptors. (d) none of the above.
Heterozygotes for the sickle cell trait have an adaptive advantage in areas where malaria is prevalent. This is an
example of ____.
a. a fixed allele b. genetic drift c. a balanced polymorphism d. sexual selection e. disruptive selection
Hershey and Chase tagged the DNA of viruses with radioactive phosphorus, and their protein coats with radioactive sulfur. When the viruses were allowed to infect bacteria, what did the viruses transfer to the bacteria?
A. radioactive phosphorus B. neither radioactive phosphorus nor sulfur C. radioactive phosphorus and sulfur D. radioactive sulfur
Which of the following is not used as an antiseptic?
A. Chlorhexidine B. 3% hydrogen peroxide C. Aqueous glutaraldehyde D. Iodophor E. Merthiolate