Which blood vessel travels from the small intestine directly to the liver?
a. hepatic portal vein
b. hepatic vein
c. aorta
d. inferior vena cava
e. mesenteric vein
A
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A heritable change in the genetic material is called a mutation
Indicate whether the statement is true or false
What term describes regulation of the trp operon that can occur even in trpR? mutants, thus suggesting that the mechanism is repressor-independent?
A) modulation B) derepression C) attenuation D) amplification
The matrix of connective tissue can be liquid, gel-like or solid.
a. true b. false
What is a characteristic of a hydrostatic skeleton?
a. Hydrostatic skeletons effectively thicken one part of the body while thinning another. b. Hydrostatic skeletons permit very precise and delicate movements. c. Contractile cells of the hydrostatic skeleton work in an antagonistic fashion. d. Contractile cells of the hydrostatic skeleton work in an agonistic fashion. e. Hydrostatic skeletons do not facilitate movement.