Which one of the following is TRUE regarding the lymphatic system?
A) The lymphatic system removes microorganisms from body fluid.
B) Lymph flows from lymph capillaries to larger lymphatic vessels to the heart and lungs.
C) Lymphatic capillaries absorb lipid droplets from plasma.
D) Lymph is excreted from the body.
E) Lymphatic capillaries produce interstitial fluid.
A
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Control of a physiological state by a negative feedback loop differs from control by a positive feedback loop in that only in the case of negative feedback
a. does the physiological state tend to remain close to constant. b. does an effector respond to change by increasing output. c. is the effector controlled by some form of sensory input. d. is the response likely to be helpful to an organism's fitness. e. c and d.
When testing the antimicrobial susceptiblity of heaemophilus influenza strains by disk diffusion, the recommended medium is
A. buffered charcoal yeast extract agar B. chocolate agar C. Mueller-Hinton agar with X and V factors D. Mueller- Hinton agar with 5% sheep blood
Which of the following characteristics distinguishes coronaviruses from rhinoviruses?
A) replicate best at 33°C B) transmitted via respiratory droplets C) cause common colds D) envelope is present E) virions contain single-stranded positive RNA
The government runs an experiment where a random sample of 200 adults over 40 get a 5% tax cut and a random sample of 200 adults under 40 get no tax cut. Their results show that spending, on average, increased 8% with a 5% tax cut. They conclude that a 5% tax cut for all adult Americans will increase spending by 8%. Why is this logic flawed?
A. The measured effect of the treatment on the treated may be biased. B. A 5% tax cut for all Americans suffers from selection bias. C. The effect of the treatment on the treated may not be the average treatment effect. D. The logic is not flawed.