Mammals have opposing groups of muscles at a joint; for example, the ________ flexes the forearm and the ________ extends it
a. biceps / triceps
b. triceps / deltoid
c. deltoid / pectoralis
d. pectoralis / triceps
a
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Consider the genes that encode the light chain of antibody molecules in a particular mammal. There are five V regions, three J regions, and one C region. How many different light chain sequences could be formed based on combinatorial joining?
A. 9 B. 2 C. 15 D. 8
Destruction of the corpus luteum results from a
__________ levels if pregnancy does NOT occur. a. decline in chorionic gonadotropin b. decline in LH c. surge in progesterone d. spike in LH e. spike in estrogen
An atom is called an ion when it has
a. either lost or gained electrons. b. either lost or gained protons. c. more neutrons than protons. d. lost its nucleus.
The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?
A) nitrogen fixation B) osmotic pressure C) pH D) hydrostatic pressure E) quorum sensing