In order for a protein to be an integral membrane protein it would have to be A)
ID: 100843 • Letter: I
Question
In order for a protein to be an integral membrane protein it would have to be A) hydrophilic. B) hydrophobic. C) amphipathic, with at least one hydrophobic region. D) completely covered with phospholipids. E) exposed on only one surface of the membrane. The primary function of polysaccharides attached to the glycoproteins and glycolipids of animal cell membranes is A) to facilitate diffusion of molecules down their concentration gradients. B) to actively transport molecules against their concentration gradients. C) to maintain the integrity of a fluid mosaic membrane. D) to maintain membrane fluidity at low temperatures. E) to mediate cell-to-cell recognition. Which of these are not embedded in the hydrophobic portion of the lipid bilayer at all? A) transmembrane proteins B) integral proteins C) peripheral proteins D) integrins E) glycoproteins What kinds of molecules pass through a cell membrane most easily? A) large and hydrophobic B) small and hydrophobic C) large polar D) ionic E) monosaccharides such as glucose Which of the following is a characteristic feature of a carrier protein in a plasma membrane? A) It is a peripheral membrane protein. B) It exhibits a specificity for a particular type of molecule. C) It requires the expenditure of cellular energy to function. D) It works against diffusion. E) It has few, if any, hydrophobic amino acids.Explanation / Answer
32) b. Hydrophobic.
This is because is has to be completely embeddednin the sea of lipids present in the plasma membrane which is msdenup of lipid bilayer. Hydrophillic would get repelled, amphipathi with one hydrophobic region is require when the protein has to be a trasmembrane one wher a small portion of the protein spans the membrane while the rest is either facing the outside of the cell or the cytoplasmic side. Phopspholids would bear charge and would be unlikely to be surrounded by lipids of the membrane. Integral means inside and hence can be exposed to any side of the membrane.
33)e. To mediate cell to cell communication. Glycoproteins or glycolipids are generally located on the outer surface of the cell. They bind to molecules of the ECM or the other neighbouring cells in order to interact.
34) c. peripheral proteins. They are temporarily attached to the membrane via integral membranes
35) b. small hydrophobic
Small size allows them to squeeze in through themembrane and since the membrane itself is majorly hydrophobic owing to its lipid by layer it readily welcomes anything that is hydrophobic.
36)b. Exhibits specificity for a particular molecules.
Different molecules have their separate carriers.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.