You would predict to see the fewest amino acid sequence substitutions in a protein between a human and a(n) ________.
A. bird
B. bacterium
C. fish
D. snake
E. orangutan
Answer: E
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Within the transcription bubble, the 9 most recently added nucleotides in the newly synthesized RNA strand temporarily form a helix with the template DNA strand. How might transcription be affected if helix formation did not occur?
A. Rewinding the DNA molecule would be inhibited. B. Unwinding the DNA molecule would be inhibited. C. The position of the 5' end of the RNA would be unstable, inhibiting elongation. D. The position of the 3' end of the RNA would be unstable, inhibiting elongation. E. The position of the 5' end of the RNA would be unstable, stimulating elongation.
In streams and rivers, most of the microbial biomass is ________.
A. metabolically inactive B. floating on the surface C. buried in bottom sediments D. attached to surfaces
Humans have different thermoreceptors for heat and cold
Indicate whether the statement is true or false.
Which microscope is used to see intracellular detail in a living cell?
A) fluorescence microscope B) two-photon microscope C) atomic force microscope D) transmission electron microscope E) brightfield microscope