Which ion is present at higher concentration outside a neuron at rest?
A. sodium
B. potassium
C. calcium
D. chloride
A
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In which form are electrons transferred during typical redox reactions such as the oxidation of glucose?
A. as free electrons B. as hydrogen atoms C. as oxygen atoms D. as carbon atoms E. as phosphate groups
Chromosomes condense during what phase of mitosis?
a. prophase b. prometaphase c. metaphase d. anaphase
The studies of alkaptonuria provided the first evidence of a connection between genes and metabolism. Who conducted these studies?
a. Archibald Garrod b. Watson and Crick c. Frederick Griffith d. Beadle and Tatum
A friend asks you how exocrine glands differ from endocrine glands. She knows that both form from invaginated epithelium. How do you respond?
A. Exocrine and endocrine glands are essentially the same, both produce products that are secreted to the skin's surface. B. The liver is an endocrine gland that secretes directly into epithelial tissues. The pituitary gland is an exocrine gland that secretes into the blood stream. C. Exocrine glands are found in the thoracic cavity while endocrine glands are located in the pleural cavity. D. Endocrine glands produce hormones which enter the blood stream, while exocrine glands secrete sweat and oil directly to the surface of the skin. E. Exocrine glands produce hormones which enter the blood stream, while endocrine glands secrete sweat and oil directly to the surface of the skin.