During which phase does crossing-over occur?
a. interphase
b. prophase I
c. metaphase I
d. prophase II
e. metaphase II
B
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A current problem in modern medicine is the development of drug resistance mutations. This occurs when a mutation arises in a disease-causing microbe making it resistant to a drug and thus rendering the drug useless in treating a specific disease. Many useful drugs are competitive inhibitors of specific enzymes, and the drug-resistance mutations prevent the binding of the drug. These types of mutations, in addition to preventing competitive inhibitor binding, can also sometimes reduce the activity of the enzyme. Why is that the case?
A. Binding to the competitive inhibitor is essential for the function of the enzyme B. These mutations most likely affect an allosteric site on the enzyme C. These mutations lower the activation energy of the reaction catalyzed by the enzyme D. These mutations most likely change the shape of the active site of the enzyme Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about enzymes and how their activity is regulated? How does this drug affect enzyme activity under normal circumstances? What other information is related to the question? Choose Answer Do you have all necessary information to analyze how drug resistance would reduce enzyme activity? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Describe the makeup of the phospholipid bilayer. Include molecular orientation and proteins as well
What will be an ideal response?
Concerning catabolism and anabolism,
A. they refer to reactions solely dealing with the metabolism of lipids. B. the intermediates of one serve as the reactants in the other. C. the energy gathered in one is utilized in the other. D. they refer solely to the reactions involved in synthesis of carbohydrates. E. the intermediates of one serve as the reactants in the other AND the energy gathered in one is utilized in the other.
The relationship between DNA and RNA is ____
a. antagonistic
b. opposite c. exact duplicate d. complementary e. unrelated