The distinction between cytochrome c of chickens and humans versus chickens and ducks was a difference determined by
A. sequencing of mtDNA.
B. sequencing of rDNA.
C. DNA-DNA hybridization.
D. sequencing of amino acids.
E. immuno-rejection of antibodies.
Ans: D. sequencing of amino acids.
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What happens to air as it is cooled?
a. It rises. b. It sinks. c. It moves toward higher latitudes. d. It moves along a pressure gradient. e. It moves toward lower latitudes.
________ is a hormone produced by the seminiferous tubules that inhibits FSH from stimulating the production of sperm cells
Fill in the blank(s) with correct word
Which one of the following diagnostic imaging techniques does NOT expose the patient to additional radiation?
A) X- rays and ultrasounds B) ultrasounds and PET scans C) ultrasounds and MRI D) PET scans and MRI E) PET scans and X-rays
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. The form of leptin released by obese people may lack protein kinase activity. B. Paracrine signaling may be disrupted in obese people with high levels of leptin. C. Obese people who have high levels of leptin may have a leptin receptor with decreased sensitivity. D. In obese people with high levels of leptin, the leptin is a nonfunctional second messenger.