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%

Biology & Microbiology

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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)

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The first group to exhibit an amniotic egg was

the a. Aves. b. Amphibia. c. Reptilia. d. Osteichthyes. e. Mammalia.

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Wetlands and floodplains control flooding by

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Biology & Microbiology

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.

Biology & Microbiology