In the 1950s, Earl Sutherland and colleagues discovered that epinephrine ____
a. leads to release of a second messenger that ultimately results in hydrolysis of glycogen to
glucose
b. leads to release of a second messenger that lowers blood glucose by causing it to bind to
liver cells
c. interacts directly with the enzyme glycogen phosphorylase
d. interacts directly with the cell membrane to help transport glucose into the cell
e. is a signaling molecule that does not require a cell surface receptor
A
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Aminoglycoside antibiotics
A. inhibit folic acid biosynthesis. B. inhibit cell wall synthesis. C. bind to bacterial DNA polymerase. D. bind to the 30S ribosomal subunit.
Some animals have no gills when young, but then develop gills that grow larger as the animal grows larger. What is the reason for this increase in gill size?
A) The young of these animals are much more active than the adult, which leads to a higher BMR (basal metabolic rate) and, therefore, a higher need for oxygen. B) Relative to their volume, the young have more surface area across which they can transport all the oxygen they need. C) The young have a higher basal metabolic rate. D) Relative to their surface area, the young have more body volume in which they can store oxygen for long periods of time.
The sex chromosome composition of a person with Klinefelter syndrome is most accurately written as
a. XXX. b. XO. c. XXY. d. XYY. e. YO.
Joints like the hip and shoulder are classified as ____
a. synovial joints b. fibrous joints c. membranous joints d. cartilaginous joints e. hinge joints