In some studies that use observational rather than experimental data, investigators develop ____, which conceptually
predict what they would see if a particular factor had no effect.
a. control treatments
b. null models
c. experimental controls
d. null treatments
e. experimental models
ANSWER: b
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In translation the joining of amino acids is catalyzed by the enzyme ____
a. RNA polymerase b. reverse transcriptase c. peptidyl transferase d. polyadenylase e. aminoacyl-tRNA synthetase
Which of the following enzymes unwind and open the DNA double helix at the start of DNA replication?
a. DNA Polymerase b. Telomerase c. Helicase d. DNA Ligase
You are viewing a blood vessel under the microscope. You see three distinct layers, one of which is a thick muscular layer. The layers are separated by extensive elastic tissue. This vessel is most likely a(n)
A) capillary B) arteriole C) vein D) artery
Which of the following statements regarding the surface of the skin is false?
A. It has sebum as a coating. B. It has normal microbiota. C. It has goblet cells. D. It is salty. E. It is acidic.