How many codons do not code for any amino acid?

A. 0 D. 3
B. 1 E. 4
C. 2


D

Biology & Microbiology

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Individuals that are heavy smokers may eventually have trouble clearing the mucous from their lungs because the structures that move fluid along the epithelial lining of the lung become damaged over time. What are these structures called?  

A.  Pili B.  Flagella C.  Cell walls D.  Cilia

Biology & Microbiology

Which of the following is found in angiosperms but not in gymnosperms?

A) seeds B) pollen C) cones D) microsporangia E) anthers

Biology & Microbiology

By volume, what percentage of cells in blood are white blood cells?

a. 15 percent b. 50 percent c. 1 percent d. 85 percent

Biology & Microbiology

If all the following DNA fragments were analyzed on an electrophoresis gel, which one would migrate farthest from the negative electrode?

A. 5000 base pairs B. 750 base pairs C. 1000 base pairs D. 250 base pairs E. 2500 base pairs

Biology & Microbiology