You sprain your ankle at a roller derby practice. How would you treat your injury?
A) First use ice to reduce swelling, and then use heat much later to aid healing.
B) First use heat to aid healing, and use ice later to reduce swelling.
C) Use ice only because it will reduce swelling and increase blood flow to aid healing.
D) Just leave it alone. Ice and heat both make the injury worse.
A
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Consider a tadpole becoming a toad. You would expect to find it changing its form of nitrogenous waste from ________ to __________.
A. ammonia, urea B. urea, ammonia C. uric acid, urea D. urea, uric acid E. uric acid, ammonia
The proportion of individuals in a population that are of a particular genotype is the
A) phenotype frequency. B) genotype frequency. C) allele frequency. D) None of the choices is correct.
Leptin is a circulating hormone that is produced by fat cells and plays a role in body metabolism and obesity. It normally binds to receptors in the brain and inhibits appetite. Studies have demonstrated that when obese mice that are leptin deficient are injected with leptin they quickly lose their excess weight. Interestingly, however, many overweight people have high levels of leptin in their bloodstream. Why do you think that the high levels of leptin in obese individuals are insufficient to curb their appetite?
A. In obese people with high levels of leptin, the leptin is a non-functional second messenger. B. The form of leptin released by obese people may lack protein kinase activity. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. Paracrine signaling may be disrupted in obese people with high levels of leptin.
A substance that can elicit an immune response from a lymphocyte is called a(n) ________
A) defensive protein B) pathogen C) antibody D) antigen