How many bases are necessary to complete three complete twists (1080 degrees) of a DNA helix?
A. 5
B. 10
C. 30
D. 60
B
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The sheets of red algae used to wrap sushi are actually what stage of the Porphyra life cycle?
a. sporophyte b. zygote c. gametes d. gametophyte
The tricuspid valve is located between the right atrium and the right ventricle
____________________ Indicate whether the statement is true or false.
Which of the following statements is correct?
A) Prokaryotic cells and eukaryotic cells evolved at the same time. B) Prokaryotic cells evolved a lot earlier (over a billion years) than eukaryotic cells. C) Eukaryotic cells evolved a lot earlier (over a billion years) than prokaryotic cells. D) Scientists do not have any evidence on whether prokaryotic or eukaryotic cells evolved first.
In plants, ammonium is often converted to nitrate before it can be used by the plant. This process is known as
A) nitrogen fixation. B) photosynthesis. C) decarboxylation. D) nitrification. E) denitrification.