Which of the following statements about siderophores is FALSE?
A) Siderophores are considered as bacterial virulence factors.
B) Siderophores increase permeability of the outer membrane for G- bacteria.
C) Siderophores bind iron and transport it into the bacteria.
D) Siderophores compete for iron from host proteins transferrin and lactoferrin.
E) none of the above.
Ans: B) Siderophores increase permeability of the outer membrane for G- bacteria.
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You are investigating an abnormal eukaryotic cell line that makes all of its mRNAs much longer than the mRNAs from normal cells (that is, they have more nucleotides than usual). Intrigued, you examine the proteins in these abnormal cells and note that
many of them are either much longer or much shorter than the normal proteins from nonmutant cells. Assuming there is just one mutant defect in these cells, what is that defect? A. A stop codon is mutated. B. RNA polymerase does not recognize the terminator sequence. C. Release factor is defective. D. The spliceosome is nonfunctional. E. The enzyme that adds the poly-A tail is defective.
The C-value paradox is the:
A. disconnect between genome size and organismal complexity. B. disconnect between genome size and gene ratio. C. disconnect between genome size within the same species. D. disconnect between genome size and gene size. E. disconnect between genome size and protein ratio.
The process by which the major land masses have shifted their positions, changed shapes and separated from each other, is known as
A. Cotranslational sorting. B. Continental drift. C. Depolarization of land masses. D. Differential land movement. E. Cyclic land drift.
The transfer of polypeptides into the ER is called
A) transit sequence import. B) post-translational import. C) cotranslational import. D) endoplasmic import. E) ribosomal import.