In which of the following conditions is(are) microbial infection often implicated as a cause?
A. female infertility
B. coronary artery disease
C. gastric ulcers
D. cervical cancer
E. All of these choices are correct.
Answer: E
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Dynein motor proteins use ATP energy to:
A. carry vesicles along a microtubule within a cell in a minus-to-plus direction. B. carry vesicles along a microfilament within a cell in a minus-to-plus direction. C. carry vesicles along a microtubule within a cell in a plus-to-minus direction. D. carry vesicles along a microfilament within a cell in a plus-to-minus direction. E. slide along microfilaments to contract muscle cells.
Why is repairing a single-stranded break easier to repair than a double-stranded break?
What will be an ideal response?
Which of the following properties of RNA is most directly responsible for its ability to form complex shapes?
A) the presence of uracil instead of thymine B) the fact that RNA is primarily double-stranded C) the relative instability of RNA compared to DNA D) the fact that RNA is primarily single-stranded E) the substitution of deoxyribose in DNA with ribose in RNA
Enzymatic digestion of proteins starts in the
A. mouth. B. esophagus. C. stomach. D. small intestine.