The most widely used light microscope transmits light through a live specimen to produce an image where the specimen is darker than its surroundings. What type of microscope is this?
A) bright-field
B) dark-field
C) differential interference
D) electron
Answer: A) bright-field
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Most known methanogens are nonhalophilic
A) psychrophiles. B) mesophiles. C) thermophiles. D) extremophiles (at either the psychrophilic or thermophilic end).
Microbes are sometimes used in secondary treatment of wastewater to
A) convert heavy metals into carbon dioxide. B) remove organic matter. C) remove large particles. D) convert heavy metals into carbon dioxide, remove organic matter, and remove large particles.
The acrosomal reaction is the ____
a. activation of a sperm cell through attachment of an acrosome b. release of digestive enzymes from the acrosome after the initial attachment of a sperm to an egg c. fusion of sperm and egg nuclei using enzymes from the acrosome d. use of enzymes from the acrosome to block the attachment of other sperm cells to the egg e. initial binding of the sperm to the zona pellucida
The event that initiated biological evolution was the flow of information from DNA to RNA to protein.
a. true b. false