In a randomized, controlled, double-blind study:
A) neither the experimenter nor the subject know whether the subject is in a control group or an experimental group.
B) individuals will be assigned to an experimental or control group depending on whether or not they took part in a pilot study.
C) experimental subjects are blindfolded when given the experimental treatment.
D) all experimental groups are filled randomly using no particular criteria.
E) the experimenter knows which subjects are in the experimental group but not the control group.
A) neither the experimenter nor the subject know whether the subject is in a control group or an experimental group.
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
Which group of mammals lays eggs that have a leathery shell? a. Marsupials b. Placental c. All mammals lay eggs
d. None of the mammals lay eggs. e. Monotremes
Which of the following animals did Darwin
study that helped form his ideas on evolution?
a. dogs b. armadillos c. glyptodons d. finches e. all of these were animals Darwin studied
Does cytokinesis differ between plant and animal cells?
What will be an ideal response?