Describe the use of combination drugs and why they are effective. Provide examples
What will be an ideal response?
Answer: The efficacy of some antibiotics can be retained if they are given with compounds that inhibit antibiotic resistance. Several β-lactam antibiotics can be combined with β-lactamase resistant microorganisms. For example, ampicillin can be mixed with a β-lactamase inhibitor that binds irreversibly, preventing degradation of the ampicillin. Also, the use of sulfamethoxazole-trimethorprim prevents the loss of efficacy through mutation and selection of resistance.
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In humans, XO individuals are females with Turner syndrome and XXY individuals are males with Klinefelter syndrome. Which of the following events cannot give rise to a Klinefelter male?
A) nondisjunction at meiosis I in the mother B) nondisjunction at meiosis II in the mother C) nondisjunction at meiosis I in the father D) nondisjunction at meiosis II in the father E) All of the choices could give rise to a Klinefelter male.
A covalent bond is formed between an anion and a cation.
Answer the following statement true (T) or false (F)
Small populations on islands can be said to have experienced a form of genetic drift called the
founders effect.
Indicate whether the statement is true or false.If adenylyl cyclase were inhibited in animal cells
a. binding of epinephrine to beta receptors would have no affect on cyclic AMP levels. b. binding of epinephrine to beta receptors would increase cyclic AMP levels. c. an increase in mRNA for cyclic AMP would occur. d. an increase in mRNA for more beta receptors would occur. e. epinephrine would not be able to bind to beta receptors.