As new enzymes are discovered, the EC system for naming enzymes is to be used. The names are to be based on which of the following criteria?
A) the name of the substrate
B) a description of substrate function
C) an indication of the size of the substrate
D) the six major classes of enzyme function
E) the size of the enzyme
Answer: D
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Microorganisms in the human colon are more often being described as mutualistic with human hosts rather than commensalistic. Why has this change in the definition of a symbiotic relationship occurred?
A. As we learn more about the ecology of the human microbiome, we have learned that these organisms are dependent on the nutrients that we provide for their survival. B. As we learn more about the ecology of the human microbiome, we recognize our dependence on these organisms for immunity, vitamin production, and other essential processes. C. As we learn more about the makeup of the human digestive tract, we realize that some microorganisms are potentially pathogenic while others are not. D. All of the choices are correct.
Sucralose is a non-caloric artificial sweetener. Its structure is similar to sucrose, but with three of sucrose's hydroxyl groups replaced by chloride. How do you predict sucralose behaves in the body?
A. Sucralose enters cells by diffusion. B. Sucralose is unable to bind conventional sugar transporters and is excreted. C. Sucralose binds to glucose transporters and is metabolized by normal metabolic pathways. D. Sucralose does not enter the body.
Arthroscopic surgery is used to repair damage to the knee. What sorts of things can go wrong that can lead to damage in someone's knee?
What will be an ideal response?
The first leaves produced by an embryo while still inside the seed are
A) cotyledons. B) epicotyls. C) coleoptiles. D) endosperms. E) embryo sacs.