To which system do the kidneys and bladder belong?
What will be an ideal response?
urinary
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A particular gene has a mutation in its NFR that causes it to bind abnormally tightly to histones. What effect would you expect this mutation has on the expression of this gene?
A. The expression of the gene would be abnormally high. B. The effect on gene expression is impossible to predict. C. The gene would encode a different protein instead. D. The expression of the gene would be abnormally low or absent E. The promoter of the gene will be constantly available to transcription factors and RNA polymerase.
Cyanobacteria are ____
a. chemoautotrophs only b. chemoheterotrophs c. photoautotrophs d. photoheterotrophs only e. chemoautotrophs and photoheterotrophs
Which of the following is the most serious toxin involving acetylcholine?
a. Botulinum b. Prairie rattlesnake venom c. Hemicholinium-3 (HC-3) d. Black widow spider venom
The damage caused by main-chain scission, cross-linking, and point lesions is permanent.
a. true b. false