When is an experiment considered to be double-blind?
A) The hypothesis being tested is not based on previous observations.
B) It has already been performed by different researchers.
C) Neither the subjects nor the researchers know who is in the experimental and control groups.
D) The results of the experiment are only revealed to certain researchers.
C
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Through studies of insect Malpighian tubules, researchers found that K+ accumulated on the inner face of the tubule, against its concentration gradient. What can you infer about the mechanism of transport?
A) Potassium transport is a passive process. B) Movement of potassium into the lumen of the Malpighian tubules is an energy-requiring process. C) Potassium moves out of the tubules at a faster rate than it moves into the lumen of the tubules. D) Sodium ions will follow potassium ions.
Members of the ____ Ecdysozoan phylum include insects, spiders, crustaceans, millipedes, and centipedes
a. Arthropoda b. Onychophora c. Nemertea d. Annelida e. Nematoda
What experiment demonstrated that the 5'-to-3' exonuclease activity of DNA polymerase I was essential for cell viability?
What will be an ideal response?
In replication, once the DNA strands have been separated, reformation of the double helix is prevented by:
a. DNA helicase enzyme. b. single-strand binding proteins. c. DNA polymerases. d. ATP. e. DNA primase.