Varieties of Staphylococcus aureus that are resistant to the drug methicillin _____.
A. developed in response to the use of methicillin
B. already existed in the population before methicillin was developed
C. always have an advantage in every environment
D. were strongly selected for as methicillin became widely used to treat bacterial infections
E. The second and fourth answers are correct.
E. The second and fourth answers are correct.
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Which of the following is the portion of the vertebrate skeleton that includes the skull, vertebrae, and ribs?
A. the axial skeleton B. the central skeleton C. the appendicular skeleton D. the trunk
During this phase of the cell cycle the microtubules of the spindle fiber attach to the kinetochore:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
Which of the following are the respiratory openings in insects?
a. spiracles b. trachea c. chitins d. cephalothorax
Given your results from the baby's spit up/vomit, you run an X-ray while the baby is eating. This allows you to determine whether there is a blockage in the organ that generates that enzyme (physical), or if there is a problem with the enzymes themselves (chemical). Which of the following results would help you decide whether the problem is solely physical or chemical?
a. Chemical: The enzyme was spit up, but the digestive path appears normal b. Physical: The enzyme was spit up, but the digestive path appears normal c. Chemical: The enzyme was spit up, but the digestive path has a lump stopping movement of food d. Physical: The enzyme was not spit up, but the digestive path has a lump stopping movement of food e. Chemical: The enzyme was not spit up, and the digestive path appears normal