What is a characteristic of savannas?
a. Frequent fires
b. Vertical layering of vegetation
c. Long, cold winters
d. Dense, deciduous trees
a. Frequent fires
Frequent fires is a characteristic of savannas.
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The virus structure indicated by the arrow labeled A is the
Use the labeled arrows to answer questions related to these five viruses.
A. genetic material, DNA or RNA.
B. the bacteriophage.
C. the bacterial membrane.
D. the lipid-rich envelope.
E. the protein coat, or capsid.
How many hydrogen bonds are there between cytosine and guanine?
a. none b. one c. two d. three
The first organisms used in recombinant DNA technology were ___________
A. fungi D. cows B. bacteria E. humans C. sheep
What are the characteristics of red light, which is absorbed by chlorophylls?
A. Its photons have the shortest wavelength in the visual spectrum. B. Its photons have the highest energy in the visual spectrum. C. It is not considered a part of the visual spectrum. D. Its photons have the longest wavelength in the visual spectrum.