Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. Are phages a density-dependent or a density-independent regulating factor?
A. density-independent
B. density-dependent
Answer: B
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Urine and fecal specimens require
A. sterile collection conditions. B. incubation in selective media. C. incubation in differential media. D. Both sterile collection conditions and incubation in differential media are correct. E. Both incubation in differential media and incubation in selective media are correct.
You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Indicate which of the following statements are true and which are false. ______ The wound is swollen and red due to vasoconstriction
______ The wound breached the first level of the patient's innate immune system: the skin. ______ The wound may require both the innate and the adaptive immune system in order to heal. ______ The wound is swollen and red due to vasodilation. ______ Cells in the wound are secreting antihistamines . What will be an ideal response?
________ stochasticity is the random variation in birth and death rates that occurs in populations from year to year as a result of natural disasters and other annual variations in the environment
Fill in the blank(s) with correct word
Carpal tunnel syndrome is caused by an inflammation of tendons passing through the carpal tunnel of the wrist. What causes this inflammation and pain?
A) The tendons become stretched out and ultimately tear away from the bone. B) Certain continuous hand motions cause the tendons to repeatedly rub against bone. C) The associated muscles are too weak and begin to spasm, leading to inflammation. D) The muscles eventually fatigue and become swollen, thus swelling the tendon.