1. Using a directs an electron beam though a thin-cut section of the specimen an
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Question
1. Using a directs an electron beam though a thin-cut section of the specimen and results in a two dimensional image. a. Light microscope b. Transmission election microscope c. Scanning electron microscope d. Your eyes 2. True or False: Peripheral proteins are imbedded within and extend across bilayer. 3. True or False: Diffusion is a form of passive transport, which does not require energy. 4. Channel mediated transport allows for the movement ofthrough the plamsa membrane a. b. c. d. Small non polar solutes Small ions Small polar molecules Nothing 5. The plasma membrane is composed of a of phospholipids. These molecules areboth water loving and water fearing, which allows for the self-assembling natural arrangement. a. Single layer; Amphipathic b. Double layer; Hydrophobic c. Double layer; Amphipathic d. Double layer; Hydrophilic e. Single layer; Hydrophobic 6. transport is responsible for the movement of small polar molecules across the plasma membrane. a. b. c. d. e. Channel-mediated Carrier-mediated Osmosis Simple diffusion None of the above are correctExplanation / Answer
1.(a) light microscope
Bright-field microscopy produces an image made from light ... exactly one-half wavelength cancel each other and result in no intensity resulting in 2D image
2.False
because Peripheral membraneproteins, or extrinsic proteins, do not interact with the hydrophobic core of the phospholipid bilayer.
3.True
diffusion is movement in high concentration to low concentration, which do not require any additional effoets for movement
4.(b) small ions
Ions pass through channels down their electrochemical gradient, which is a function ofion concentration and membrane potential, "downhill", without the input (or help) of metabolic energy
5.(c) double layer ; amphipathic
The phospholipids of a cell membrane are arranged in a double layer called the lipid bilayer.
The hydrophilic phosphate heads and hydrophobic tail of phospholipids are always arranged so that they are near water.
6.(b) carrier mediated
Molecules from areas of higher concentration to areas of lower concentration. The movement of small, polar molecules across the plasma membrane by a carrier protein is called carrier transport.
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