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BIO 353 - FINAL OE COMPLETE QUESTIONS AND ANSWERS (VERIFIED)
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BIO 353 - FINAL OE COMPLETE QUESTIONS AND ANSWERS (VERIFIED)
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BIO 353 - FINAL OE COMPLETE QUESTIONSAND ANSWERS (VERIFIED)
negative feedback regulation in physiological control systems postulates (means that..):
a. the value of the controlled variable never changes
b. the set-point for a controlled variable is kept at a lower value than the actual value for the variable
c. the set-point value assumes the value of the controlled variable
d. the value of the controlled variable fluctuates around a narrow range of the set-point value
e. the set-point value tracks the value of the controlled variable
ANSWER = d. the value of the controlled variable fluctuates around a narrow range of the set-point
value
homeostasis is describes as:
a. every deviation in the value of a physiological parameter is corrected by negative feedback regulation
b. the body's internal environment is constantly changing
c. the tendency of organisms to maintain a relatively constant internal environment
d. the product of a chemical reaction negatively feeds back to inhibit its own production
e. physiological parameters don't change
,ANSWER = c. the tendency of organisms to maintain a relatively constant internal environment
human blood glucose concentrations are regulated by the pancreas. After eating, blood glucose
concentrations increase. In response insulin secretion causes blood glucose to decrease towards
concentrations of 90mg/100ml of blood by stimulating glucose uptake. In the terminology of
physiological feedback regulation, which is correct?
a. blood glucose concentration = controlled variable; insulin = pathway (to effectors); storage tissues =
effectors
b. blood glucose concentration = controlled variable; insulin = effector; storage tissues = sensor
c. blood glucose concentration = effector; insulin = controlled variable; storage tissues = sensor
d. blood glucose concentration = effector; insulin = controlled variable; storage tissues = pathway
e. none of the above
ANSWER = a. blood glucose concentration = controlled variable; insulin = pathway (to effectors);
storage tissues = effectors
which of the following best describes the ion concentrations in the ICF versus ECF?
a. Na+, A- (protein anions), and K+ high in ICF
b. Na+ and A- high in ICF; K+ high in ECF
c. Na+ and A- high in ECF; K+ high in ICF
d. Na+ high in ECF; K+ and A- high in ICF
e. Na+, K+, and A- high in ECF and low in ICF
ANSWER = d. Na+ high in ECF; K+ and A- high in ICF
,plasma membranes with a composition of high lipid and low protein are likely to occur in cell types that:
a. function in thermal insulation
b. perform the same function as cells with membrane with a high protein to lipid ratio
c. associate themselves with the axons of neurons to electrically insulate their ICF from the ECF
d. function in lipid storage
e. perform transport functions across epithelia
ANSWER = c. associate themselves with the axons of neurons to electrically insulate their ICF from the
ECF
which characteristic enhances passive diffusion of molecules across cell membranes?
a. high molecular weight
b. high water solubility
c. high positive charge
d. high lipid solubility
e. b and c
ANSWER = d. high lipid solubility
facilitated diffusion across cell membranes:
a. depends on the hydrolysis of ATP
b. depends on the direction of the concentrations gradient
c. increases with the magnitude of the concentration gradient
, d. reaches saturation at high concentrations
e. b, c, and d
ANSWER = e. b, c, and d
according to fick's law the diffusion rate of a substance through a cell membrane decreases with:
a. a smaller concentration gradient of a substance across the membrane
b. a high permeability of the membrane for the substance
c. the gas constant
d. a high lipid solubility of the substance
e. a and b
ANSWER = a. a smaller concentration gradient of the substance across the membrane
steroid hormones (like testosterone) are high lipophilic and diffuse readily across membranes. Which of
the following about their diffusion rate is correct?
a. net diffusion rate will be lower when the concentration gradient across the membrane is 1 vs 10 nM
than when the gradient is 10 vs 100 nM
b. the rate of diffusion will increase with a 100-fold increase in the concentration gradient across the
membrane
c. net diffusion rate approaches 0 when concentrations have reached equilibrium
d. a and b
e. b and c
ANSWER = e. b and c
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