Which of the following pairs is mismatched?
A) DNA polymerase — makes a molecule of DNA from a DNA template
B) RNA polymerase — makes a molecule of RNA from an RNA template
C) DNA ligase — joins segments of DNA
D) transposase — insertion of DNA segments into DNA
E) DNA gyrase — coils and twists DNA
B
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Cells of Staphylococcus aureus are cocci measuring about 1 ?m in diameter. In a textbook image of S. aureus, each cell measures about 1 cm. The magnification of the image on the page is ________.
A. 0.001X B. 10,000X C. 0.0001X D. 1,000X E. 100X F. 0.01X G. This is impossible to calculate without more information.
The synthesis of ATP in the chloroplast by ATP synthase depends on different concentrations of hydrogen ions in the lumen of the thylakoid and in the stroma
Compare these two compartments of the chloroplast in terms of both actual hydrogen ion concentration and pH scale values. What will be an ideal response?
What happens in the third step of the type I topoisomerase reaction?
A. The enzyme changes to the open conformation. B. The unbroken DNA strand passes through the break in the first strand. C. Active-site tyrosine acts as a nucleophile and attacks one strand to form an enzyme-linked intermediate. D. The enzyme changes to the closed form. E. The 3' OH of the broken strand attacks the link between the active site tyrosine and the 5' end of the broken strand, resulting in religation of the broken strand.
The Pill
a. reduces menstrual cramps. b. can cause serious cardiovascular disorders especially in smokers. c. increases the risk of breast, cervical, and liver cancers. d. is the most common fertility control method in the United States. e. includes all of these.