Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W
and Y are true?
I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies.
II) Species W and Y have more genetic similarity with each other than either did with the other two species.
III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations.
A) Only I is correct.
B) Only II is correct.
C) Only III is correct.
D) I, II, and III are correct.
Answer: D
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DNA polymerases
a. are enzymes. b. add new nucleotides to a strand. c. catalyze hydrogen bonding. d. assemble new strands in a specific direction. e. are all of these.
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.
Which of the following statements regarding an inactivated vaccine is FALSE?
A) It can be produced with deactivated whole microorganisms. B) It can be produced from antigenic fragments of a pathogen. C) It is safer than an attenuated vaccine. D) It is made from mutated forms of the pathogen. E) It is made from pathogens that cannot replicate.
Which statement about glycolysis is false?
A) It results in the oxidation of glucose. B) It requires oxygen. C) It occurs in the cytoplasm of the cell. D) It generates ATP. E) It leads to the formation of pyruvate.