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Cells 2
Cell Membranes
Question | Answer |
---|---|
Cell plasma membrane is a fundamental part of every living | True |
Fluorescently labelling the molecules of interest, bleaching the label in one small area, and then measuring the speed of signal recovery as molecules migrate back into the bleached area. What is this method called? | FRAP |
What chemical property characterizes the interior of phospholipid bilayer? | It is hydrophobic |
Ion channels are examples of active transporters | False |
How are active transport and coupled transport related? | Coupled transport uses the concentration gradient established by active transport to move molecules |
Peptide bonds are polar and thus must be covalently modified before proteins can be inserted into the membrane | False |
Which of the following statements is TRUE | Membrane lipids diffuse within the plane of the membrane |
The principal intracellular cations in the cytosol are | potassium ions |
A ___________ solution bounded by a differentially permeable membrane has proportionately fewer water molecules and more solute molecules than the adjacent solution. | hypertonic |
The relative molar concentrations of potassium inside the cells of a certain red algae growing in sea water is much higher than in the surrounding water. In order to do this, the cells must use: | ATP as an energy source |
Active transport requires the input of energy into a system so as to move solutes against their electrical and concentration gradients (electrochemical). Which of the following is NOT one of the common ways cells perform active transport? | K+-coupled |
Which of the following has the lowest rate of diffusion across an artificial membrane? | glucose |
Which region of the phospholipid are hydrophilic “water-loving”? | the phosphate group |