Tetrodotoxin is a potent poison, produced by some newts, pufferfish, and blue-ringed octopus that affects sodium transport involved with the voltage gates in neurons. A friend swimming in the Caribbean is pricked by a pufferfish and gets very sick. The most likely action the poison takes is
A. Mimicking a symporter and allowing sodium to rush out and potassium to rush in.
B. Mimicking an antiporter and allowing sodium to rush out.
C. Blocking an antiporter so sodium cannot rush in.
D. Blocking a symporter and keeping sodium from rushing in.
C
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Which of the following steps of translation does not specifically require the hydrolysis of GTP?
A. release of EF-Tu from the aminoacyl-tRNA inserted at the A site B. the peptidyl transferase reaction C. the movement of the ribosome one codon toward the 3' end of the mRNA D. dissociation of certain release factors during termination
Why is it advantageous for transcription factors to be multimeric and for their binding sites to be clustered?
A) The strength of the DNA-protein interactions is increased. B) The DNA sequence specificity of each DNA-protein interaction is increased. C) Each DNA-protein complex is better able to bind to RNA polymerase. D) Competition for binding between different transcription factors for the same regulatory region is decreased.
Brachiate primates include:a
humans. b. gibbons. c. chimpanzees. d. spider monkeys. e. gorillas.
An atom can get rid of vacancies by participating in a ___________.
A. cell bond B. physical bond C. chemical bond D. magnetic bond E. electric bond