To begin transcription, RNA polymerase must bind to a segment of DNA called the ____.
A. initiation site
B. primer
C. inducer
D. promoter
E. transcription bubble
D. promoter
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Pathogenicity islands are
A. enzymes like proteases and hemolysins that promote pathogenesis. B. gene clusters that confer the ability to become pathogenic. C. a lymphoid tissue present in the small intestine. D. closely related groups of pathogenic enteric organisms.
____ are involved in all aspects of growth, development, and function in plants. They often work together, with synergistic or opposing effects on cells
a. Enzymes b. Starches c. Sugars d. Peptides e. Hormones
At one end of a tRNA molecule is a sequence of 3 nucleotides called an anticodon that ____
a. signals the production of a ribosome b. signals the unwinding of the DNA coils c. initiates the movement of mRNA out of the cell nucleus and into the cytoplasm d. binds to its anti-complementary tRNA codon e. binds to its complementary mRNA codo
When evolutionary biologists examine DNA sequences of protein-coding genes, they observe that every third nucleotide changes more rapidly over time compare to other nucleotides. Based on the properties of the genetic code, why might this occur?
What will be an ideal response?