Which of the following is false concerning
stem cells?
a. They are undifferentiated cells.
b. They arise from a fertilized egg.
c. They can be coaxed to differentiate.
d. They are obtained from a portion of a plant
body.
e. They may help mend damaged tissue
D
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synaptic signals use ______ for communication
Fill in the blank(s) with the appropriate word(s).
__________ percent of American adults are
overweight or obese. a. 30 b. 40 c. 50 d. 60 e. 70
You are doing research on a bacterial species, trying to determine the shape, distribution, and arrangement of a number of filamentous structures that protrude from the cell surface. Which type of microscopy would best enable you to do this?
A. bright-field microscopy B. scanning electron microscopy C. dark-field microscopy D. transmission electron microscopy
Cushing's syndrome causes weight gain, excessive sweating, and muscle weakness. It can result from either the production of abnormally high levels of cortisol by the body or overuse of glucocorticosteroid drugs. You are an endocrinologist working with a Cushing's syndrome patient. She is on hormonal birth control pills and takes an occasional ibuprofen.Results from lab tests reveal abnormally high endogenous hormone levels, and you suspect a possible tumor. What regions will you ask the MRI technician to focus on?
A. Hypothalamus and posterior pituitary B. Adrenal cortex only C. Anterior and posterior pituitary D. Hypothalamus, anterior pituitary, and adrenal cortex