The most common cause of community-acquired pneumonia in adults, regardless of age, is:
a. Neisseria meningitidis.
b. S. pyogenes.
c. S. pneumoniae.
d. M. pneumoniae.
C
The most common etiologic agent of community-acquired pneumonia in adults is a bacterial species. Regardless of age or coexisting illness, S. pneumoniae is most prevalent, causing 15% to 80% of all community-acquired bacterial pneumonias.
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DNA methylation is the only known natural modification of DNA. It affects
A. adenine bases. B. guanine bases. C. cytosine bases. D. thymine bases.
Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth. Which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures. B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base. C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay. D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans. E. Mix some amino acids in salt water and cool down to 0? C.
A motor nerve and all the fibers that it controls is called a:
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. Plants are unable to use nitrogen gas directly. 2. Sunlight can actually be so intense that photosynthesis can be stopped. 3. Nitrogen is one of the most abundantly applied fertilizers worldwide. 4. When body temperature drops below normal, a person starts shivering uncontrollably. This is an example of negative feedback.