An elderly patient with no recent hospitalizations presents with shortness of breath, chest pain, a deep productive cough, and evidence of consolidation. Acid-fast and Gram stains are performed on a sputum sample. No acid-fast bacteria are detected but
Gram-negative, non-encapsulated bacteria are observed. A likely diagnosis is
A) Legionnaire's disease.
B) Streptococcus pneumoniae.
C) influenza.
D) nontypable Hemophilus influenzae B.
E) Mycobacterium avium.
Answer: D
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Electron microscopy has greater ________ than light microscopy, because the wavelengths of visible light are much larger than the wavelengths of electrons
A) contrast B) magnification C) resolution D) penetration
What is the steep and sudden decline in a population size as birth rates plummet and death rates soar?
A) carrying capacity B) a "boom and bust" cycle C) demographic momentum D) a population crash
In order to maintain homeostasis, parathyroid hormone would stimulate what response to low blood calcium levels?
A) prompt bones to store calcium B) reduce urine production at the kidneys C) stimulate the hunger drive D) prompt bones to release stored calcium E) stimulate the thirst drive
Lysosomes maintain an acidic environment by actively pumping protons into their interior.
Answer the following statement true (T) or false (F)