The virus that causes rabies travels up nerve cells to the brain and spinal cord. Which cell structures will allow the virus to move through the nerve cells?
A) Golgi complexes
B) nuclei
C) microtubules
D) pseudopods
C
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In general, repressor proteins that act to inhibit eukaryotic gene expression:
A. interfere with communication between Pol II and DNA-binding transactivators. B. block Pol II-mediated polymerization of ribonucleotides. C. bind to the C-terminal domain of Pol II. D. disrupt HMG protein-DNA interactions.
Assume a portion of the daf-2 gene has the following DNA sequence: TACCCGAAGTTC
Which of the following mutations will likely have the greatest impact on the longevity of elegans? a. TACCCAAAGTTC b. TACCCGAAATTC c. TACGCGAAGTTC d. TACCCGAAGAAA
Experimentally sending sustained stimulation to a muscle fiber causes ________
a. tetanus b. a period of insensitivity to further stimulation c. a twitch d. a forceful contraction
One problem commonly experienced in phylogeny reconstruction arises when two or more of the groups being compared have accumulated far more genetic changes (mutations) than the others in the comparison
This situation often results in a phenomenon known as "long branch attraction," in which the highly mutated lineages end up grouping together in a phylogenetic analysis even if they are distantly related. What do you think causes long branch attraction? How might it be compensated for?