If the DNA in a cell consists of 20% adenine, it will also have _____ thymine.
a. 30%
b. 80%
c. 40%
d. 20%
e. 10%
Ans: d. 20%
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Mutations in genes that affect __________ may cause morphological shifts in a lineage. Fill in the blank(s) with the appropriate word(s)
The first group to exhibit an amniotic egg was
the a. Aves. b. Amphibia. c. Reptilia. d. Osteichthyes. e. Mammalia.
Wetlands and floodplains control flooding by
A. temporarily storing water. B. diverting water to other drainage basins. C. evaporating most of the water. D. helping rain flow faster into rivers. E. Wetlands and floodplains control flooding by all of the above methods.
What are antigenic shifts?
A. Sudden, significant changes to a major antigen of a pathogen that make the pathogen easier for the immune system to recognize. B. When a pathogen moves the antigens around on its surface to disguise itself from the immune system. C. Gradual changes over time to a major antigen of a pathogen that occur through mutation. D. Sudden, significant changes to a major antigen of a pathogen that usually occur through reassortment and can cause a pandemic.