In the process of forming a root nodule, species of Rhizobium differentiate to form a type of cell called a ________.
A. nucleoid
B. vesicle
C. lymph node
D. bacteroid
Answer: D
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What is the minimum number of phage that can initiate the development of a plaque in a bacterial lawn?
A. 25 B. 10 C. 1 D. 5
What is the function of the temporomandibular joint?
A. It allows the teeth of the upper and lower jaws to fit together precisely. B. It increases the overall strength of the jaws. C. It increases the speed at which the jaws can close. D. It allows the jaw to be more flexible so that large prey items can be consumed. E. It allows the lower jaw to open and close.
Which statement about primate chromosomes is
false? a. Thirteen of twenty-three pairs of human chromosomes are nearly identical with chimpanzee and gorilla chromosomes. b. One human chromosome matches two chimp chromosomes. c. Inversions, translocations, and duplications may have contributed to differences among primates. d. Chimpanzees and gorillas have twenty-three pairs of chromosomes. e. During human evolution, two chromosomes permanently fused.
Ouabain is a chemical used on poison arrows in Africa. It works by inhibiting the sodium-potassium pump. What effect does this chemical have on an action potential?
A) It prevents the stimulation of an action potential by removing sodium from the cell. B) It immediately causes an action potential to be generated. C) There is no direct effect because the pump is used to maintain ion distributions, not to cause an action potential. D) It causes the release of a neurotransmitter that causes an action potential.