Which structure surrounds and protects the brain in all vertebrates?
a. pharynx
b. neural crest
c. oral hood
d. notochord
e. cranium
ANSWER: e
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During cell fractionation, the ____ cannot be isolated since it is destroyed when intact cells are lysed
a. lysosomes b. mitochondria c. plasma membrane d. proteins e. nucleic acids
The ____ , located ____ of the transcription start point, is the site at which RNA polymerase associates with DNA to
begin transcription.
a. promoter; upstream b. initiator; downstream c. initiator; upstream d. promoter; downstream e. intron; downstream
An individual who shelters an infectious agent long after recover is called a(n) _____ carrier.
a. incubation b. chronic c. passive d. asymptomatic e. convalescent
What is the function of kinetochores?
a. Kinetochores anchor spindle fibers to the centrioles. b. Kinetochores are the site of DNA synthesis. c. Kinetochores regulate the length of the cell cycle. d. Kinetochores attach to microtubules during mitosis. e. Kinetochores are involved in cytokinesis.