What type of microscope uses magnetic lenses to bend beams of electrons?
a. compound microscope
b. confocal microscope
c. scanning electron microscope
d. transmission electron microscope
e. light microscope
ANSWER: d
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What feature of genetic mutations can eventually lead to the evolution of new species?
A. Mutations always produce harmful effects. B. Mutations never affect protein structure or function. C. Mutations are not a mechanism through which biological evolution occurs. D. Mutations always produce beneficial effects. E. Mutations produce changes in the DNA sequence of a gene.
The standard or housekeeping sigma factor used most often by E. coli RNA polymerase under normal growth conditions is called sigma ________.
A. S B. E C. 70 D. 32
A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
A) It is a strong acid that dissociates completely in water. B) It is a strong base that dissociates completely in water. C) It is a weak acid. D) It is a weak base.
You are viewing a blood vessel under the microscope. You see three distinct layers, one of which is a thick muscular layer. The layers are separated by extensive elastic tissue. This vessel is most likely a(n)
A) capillary B) arteriole C) vein D) artery