15) The CFTR protein directly transportsions A) Na+ B) OH- C) Cl D) H+ E) Both C
ID: 213634 • Letter: 1
Question
15) The CFTR protein directly transportsions A) Na+ B) OH- C) Cl D) H+ E) Both CI- and Na+ 5) ons across the plasma membrane of epithelial cells. 16) Which molecule(s) shown below would be ionized in the cytoplasm of a cel? 16) A. B. C. C-OH D. E. A) A, B and C B) B and D C) A, D and E D) D and E E) All of the molecules would be ionized. 17) glycol (PEG) and then immediately placed at 0°C. What would you expect happens to the mouse and human marker proteins? 17) A mouse cell and a human cell with different cell-surface protein markers are fused using polyethylene A) The mouse and human markers will migrate little and remain confined to their original membrane regions. B) Both the mouse and human marker proteins will rapidly disperse evenly throughout the fused C) Both mouse and human markers will be endocytosed by the fused cell and destroyed in the fused cell. D) Only the mouse cell marker proteins will disperse throughout the fused membrane; the human marker proteins will remain confined to the original human region of the fused membrane. E) The mouse and human markers will migrate to opposite poles of the fused membrane. 18) The coding sequence of a gene contains the following codon: S-ATA-3. If a point mutation occurred in 18) which the thymine was converted to adenosine, what would result in the corresponding mutant polypeptide sequence? A) an acidic amino acid would be replaced by a nonpolar amino acid B) a polar uncharged amino acid would be replaced by a basic amino acid C) a basic amino acid would be replaced by a nompolar amino acid D) a nonpolar amino acid would be replaced by a basic amino acid E) a polar uncharged amino acid would be replaced by a nonpolar amino acid. 19) In the equation AG- AH-TAS, G stands for A) enthalpy B) entropy C) free energy D) the products E) the reactantsExplanation / Answer
15. CFTR or cystic fibrosis transmembrane conductance regulator genes or proteins transport Cl- ions.
16. Option A is correct.
17. The mouse and human markers will migrate little and remain confined to their original membrane regions.
18. Here 5'-ATA-3' (Isoleucine) will become 5'-AAA-3'( Lysine) so a non-polar amino acid would be replaced by basic amino acid.
19. In the equation, Delta G = Delta H - T delta S, G stands for free energy, Delta H for enthalpy and Delta S for entropy i.e. measure of disorderliness.
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