Which of the following is NOT a class of antibody?
a. IgA
b. IgB
c. IgM
d. IgG
e. IgE
Ans: b. IgB
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Why is Hardy-Weinberg such a valuable tool when examining populations?
A. It enables us to predict phenotype frequencies. B. It enables us to identify if a population is evolving. C. It enables researchers to identify beneficial mutations. D. It enables researchers to determine if an allele is dominant or recessive.
The most common number of carbons in fatty acid hydrocarbon chains of membrane phospholipids is
A) 7. B) 10. C) 16. D) 19. E) 24.
Inhibitors of enzymes can be either reversible or irreversible. In addition, most reversible inhibitors are either competitive or noncompetitive
Based on what you know about enzyme inhibition, classify the following examples as irreversible, competitive, or noncompetitive enzyme inhibition. A) competitive B) noncompetitive C) irreversible 1) Diisopropyl fluorophosphate binds to acetylcholinesterase and permanently inactivates the enzyme. Paralysis results. 2) A drug binds to the active site of an enzyme but disassociates and leaves the enzyme active. 3) A toxin binds to the surface of an enzyme. The enzyme then binds the substrate, but no product is produced. The toxin may disassociate and the enzyme will become active again. 4) Vitamin K is a coenzyme involved in blood clotting. An anticoagulant drug binds at the site of vitamin K bonding, blocking vitamin K binding and preventing clotting. Clotting resumes after the patient stops taking the drug. 5) Aspirin binds to prostaglandin synthetase and permanently stops its ability to produce prostaglandin.
Atoms that have the same number of protons but differ in their number of neutrons are ________.
Fill in the blank(s) with the appropriate word(s).