The figure below shows a three-dimensional model of the enzyme lysozyme and a map of the location of the important binding and catalytic amino acids that participate at the active site
Why are the amino acids of an enzyme that participate in substrate binding and in
catalytic activity widely separated on the polypeptide chain, rather than being close together in the primary sequence?
What will be an ideal response?
Answers will vary.
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In 1959, doctors began using the powerful antibiotic methicillin to treat infections of
A. Staphylococcus aureus, but within two years, methicillin-resistant strains of S. aureus (MRSA) appeared. How did the resistant strains of S. aureus emerge? Staphylococcus aureus bacteria that were able to synthesize cell walls using a protein that was not affected by methicillin survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. B. In response to treatment of Staphylococcus aureus infections with methicillin, some bacteria began to synthesize cell walls using a protein that was not affected by methicillin. These bacteria survived the methicillin treatments and reproduced at higher rates than did other individuals. Over time, these resistant individuals became increasingly common. C. In response to treatment of Staphylococcus aureus infections with methicillin, bacterial populations gradually began to synthesize cell walls using a protein that was not affected by methicillin.
What is the name for a molecule that accepts hydrogen atoms and electrons that are being removed
from other molecules and transfers them to other sites for further use? a. enzyme b. coenzyme c. protein d. lipid e. steroid
Which of the following describes the offspring of asexually produced spores?
a. They have a different mating type from the parent fungus. b. They are clones of the parent fungus. c. They are unable to reproduce. d. They have no mating type.
What was the drug used to treat individuals exposed to Bacillus anthracis endospores in 2001?
A) Amphotericin B B) Sulfonamides C) Methicillin D) Ciprofloxacin E) Isoniazid