Leaky-barrel model
What will be an ideal response?
An analogy for the settling-point model of body-fat regulation
(1) the amount of water entering the hose is analogous to the amount of food available to the subject;
(2) the water pressure at the nozzle is analogous to the positive-incentive value of the available food;
(3) the amount of water entering the barrel is analogous to the amount of energy consumed;
(4) the water level in the barrel is analogous to the amount of energy being expended;
(5) the amount of water leaking from the barrel is analogous to the amount of energy being expended;
(6) the weight of the barrel on the hose is analogous to the strength of the satiety signal
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Which of the following are mechanisms to prevent polyspermy?
_____ altering composition of exterior egg coat _____ change in membrane potential of egg _____ cortical granule enzymes remove sperm receptors from egg _____ special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one _____ toxic molecules exit the egg to attack extra sperm _____ vitelline envelopes lift off surface of egg
Which of the following is caused by nicotine in cigarette smoke?
A) faster heart rate B) constriction of blood vessels C) increased stickiness of platelets D) Nicotine causes all of the above.
Which type of vascular tissue conducts carbohydrates?
A. sclereids B. collenchyma cells C. xylem D. phloem E. fibers
Adding untreated sewage to a freshwater lake would cause the biochemical oxygen demand to
A) increase. B) decrease. C) stay the same. D) The answer cannot be determined based on the information provided.