A student was given instructions concerning the plasma membrane. He learned that
ID: 177438 • Letter: A
Question
A student was given instructions concerning the plasma membrane. He learned that the membrane prime function is to control the cell integrity. Other functions are __________. controlling the composition of space and compartment. maintain cellular shape cellular mobility a and b are correct only a, b, and c are all correct The composition of the membrane is such that the membrane structure is determined by the _____________, membrane functions are determined largely by ______________. receptors and pores enzymes and carriers lipid bilayer and proteins a, b, and c are all correct A student analyzed the plasma membrane of eukaryotic cells and found that the concentration of cholesterol affects the ____________. structure of the membrane membrane fluidity binding capacity neither answer is correct _________ are protein on the plasma membrane, in the cytoplasm, or in the nucleus that recognized and bind with specific smaller molecules. proteins receptors lipids neither answer is correct The basic component of the membrane is a bilayer of lipid molecules which consist of phospholipids glycolipids cholesterol a, b, and c are correct a is the only correct answer Cells in direct physical contact with neighboring cells are often Interconnected at specialized plasma membrane region called _______. basement matrix cell junctions fibroblasts receptors Cell must communicate with each other to maintain a stable internal environment which is known as ______ cellular communication tight junction homeostasis paracrine Passive diffusion of solute molecules across the plasma membrane occur except for those solute that are too large to diffuse through pores for solute containing charges that are identical to charges that line the ports a and b both are correct neither a or b is correctExplanation / Answer
10.e - All are correct. Plasma membranes are selectively permeable, thus control the composition of the cell and its compartments. Cellular shape and motility is brought about by the cytoskeleton by binding to the plasma membrane.
11.c - Lipid bilayer and proteins. The lipid bilayers form the cell membrane and functional proteins remain embedded within it and often get exposed to either sides with their functional domain.
12. b - Membrane fluidity - At high temperatures, it interacts with the phospholipid chains and makes it rigid. At low temperatures, the cell decreases its number in the lipid bilayer to make it fluid.
13.b - Receptors. Receptors bind to their cognate ligand molecules, get activated and bring about a chain of event that the cell needs to respond.
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