Brachiopods possess __________ germ layers.
a. no
b. one
c. three
d. two
e. four
Answer: c. three
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Which of the following methods is used to amplify RNA sequences?
A. PCR with RNA primers that anneal to repetitive DNA sequences B. reverse transcriptase-PCR using DNA primers C. quantitative PCR using RNA primers D. RNA polymerase I with DNA primers E. All of these choices are correct.
Some organisms are not able to live in an environment where there is oxygen; these types of organisms are called
obligate anaerobes. Which explanation is most plausible for how they survive without oxygen?
a. They are able to survive using less energy than aerobes. b. All of their ATP is imported into the cell from an external source. c. Sulfur is used instead of oxygen because it is chemically similar. d. These organisms use photosynthesis to produce energy. e. Their mitochondria are damaged, and consequently they are short-lived.
The living portion of the pathway through which water travels through a root is called the symplastic
pathway.
Indicate whether the statement is true or false.What are the two main branches of prokaryotic evolution?
A. autotrophs and heterotrophs B. viruses and bacteria C. bacteria and archaea D. fungi and protists