Dr. Ferguson explained that in a condition known as situs inversus, the internal organs are reversed in their orientation. Thus, the apex of the heart would be oriented to the ________.
A. left
B. middle
C. back
D. right
E. front
Answer: D
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A pathologist claims it's much easier to determine the causative agent of meningitis than an infection of the skin or intestines. Is this true? Why or why not?
A. It's not true-an infection is an infection, and it's always difficult to track down the exact causative agent. The organ system involved in the illness has nothing to do with identification of the causative agent. B. It's true-because the central nervous system (CNS) is generally microbe free, whereas the skin and intestines have a diverse normal flora. Separating out a pathogenic causative agent from the normal microbiota in these areas would be much harder to do than in the central nervous system (CNS). C. It's not true-the ventricles of the brain can provide a direct route for microbes to enter the central nervous system (CNS) from the bloodstream/extracellular fluid. Therefore, it would be just as likely to find a pathogenic microbe in the central nervous system (CNS) as it would be in the skin or intestines. D. It's true-there are only 1 or 2 microbes that can cause meningitis, yet there are hundreds (if not thousands) that can cause skin/intestinal infections. This makes it much easier to determine the causative agent for a case of meningitis.
Introduction of nonnative marine species often occurs through release of ballast water in ports of call
Indicate whether the statement is true or false
The bacterium Brucella abortus imports and uses the unusual sugar erythritol. The concentration of erythritol within the B. abortus cell is 10 mM, but the external erythritol concentration is much lower at 0.20 mM
What is the energy requirement (?G inward in kcal/mol) for the inward transport of erythritol at 37°C under these conditions? What will be an ideal response?
What is the effect of cofilin on an actin microfilament?
A) caps the microfilament plus end B) caps the microfilament minus end C) increases turnover of ATP-actin at the microfilament plus end D) increases turnover of ADP-actin at the microfilament plus end E) increases turnover of ADP-actin at the microfilament minus end