Celiac disease is a condition in which the lining of the small intestine is damaged. Which of
the following is most affected by this disease?
a. villi
b. gallbladder
c. bile secretion
d. salivary glands
A
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Imagine you conduct a parabiosis experiment with two strains of mice, one of which lacks a functional leptin gene (ob strain) while the other lacks a functional receptor for this hormone (db strain). Which of the following outcomes would you observe?
A. no weight change in the ob mouse B. no weight change in the db mouse C. increased body weight in the ob mouse D. decreased body weight in the ob mouse E. decreased body weight in the db mouse
The ________ cells are those body cells of humans that contain 23 chromosomes
Fill in the blank(s) with correct word
No two people are genetically identical, except for identical twins. The chief cause of genetic variation among human individuals is
A) new mutations that occurred in the preceding generation. B) the reshuffling of alleles in sexual reproduction. C) genetic drift due to the small size of the population. D) geographic variation within the population. E) environmental effects.
Each antibody molecule consists of
A) two light and two heavy protein chains. B) one light and one heavy protein chain. C) a "heavy" protein chain. D) a "light" protein chain. E) various combinations of light and heavy protein chains.