The production of interferons at an infection site is critical for chemotaxis
Indicate whether the statement is true or false
FALSE
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The antiparallel arrangement within DNA molecules refers to
A. a purine always bonding to a pyrimidine. B. each base bonding at the 1' position of the sugar. C. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. D. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule.
Both thermogenin and 2,4-dinitrophenol (DNP) uncouple oxidation from ATP synthesis. Thermogenin is expressed in the mitochondria of brown fat cells in newborn animals and adult mammals that hibernate
DNP was marketed in the 1930s as a diet pill, but in addition to causing weight loss it sometimes caused death. a. Compare the mechanisms by which these uncouplers affect ATP synthesis. b. What function does thermogenin serve for brown fat cells? c. Why is the rationale for DNP as a diet drug? d. Considering locations of the effects in an animal and the possibility for allosteric regulation, suggest why thermogenin is advantageous and DNP dangerous for humans?
Which of the following is a fundamental characteristic of the Notch pathway?
A) It works through nuclear signals involving the lac operon. B) It works through direct cell-to-cell contact. C) It allows mRNAs to accumulate in the posterior portion of the Drosophila embryo. D) It provides symmetry to plant flowers. E) It directs mRNAs to antisense systems in the posterior portion of all organisms.
If a cell's splicesomes were mutated so they no longer functioned normally, what consequences would result?
A. Introns would remain in the mature mRNA. B. Transcription would cease. C. Exons would be missing in the mature mRNA. D. RNA processing would remain intact. E. A functional protein would still be produced.