Membrane structure and function

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1.
FLASHCARD QUESTION
Front
Which of the following macromolecule types are NOT found in the cell membrane? Glycolipids, Polysaccharides, Proteins, Nucleic Acids
Back
Nucleic Acids
2.
FLASHCARD QUESTION
Front
Which of the following best describes the structure of the phospholipids in the plasma membrane? Options: Hydrophobic phosphate heads align in the center of a double layer; hydrophilic tails point out towards the aqueous interior and exterior., Phospholipids form a single layer with the hydrophilic heads pointing towards the exterior of the cell., Phospholipids form two layers. Hydrophilic phosphate heads point to the aqueous interior and exterior; hydrophobic tails point towards each other in the center., Phospholipids form a single layer with the hydrophobic tails pointing towards the exterior environment and the hydrophilic heads pointing towards the interior of the cell.
Back
Phospholipids form two layers. Hydrophilic phosphate heads point to the aqueous interior and exterior; hydrophobic tails point towards each other in the center.
3.
FLASHCARD QUESTION
Front
Certain membrane proteins connect the extracellular matrix to the internal cytoskeleton. Which of the following must be true about this type of protein?
Back
It must be an integral protein.
4.
FLASHCARD QUESTION
Front
Why do we describe the membrane as a “fluid mosaic”?
Back
The membrane is made out of phospholipids, proteins, cholesterol, and carbohydrates which all float fluidly around the membrane.
5.
FLASHCARD QUESTION
Front
The diagram below shows the trans-membrane portions of a membrane-bound protein. Which of the following could be said about parts A, B, and C of the protein?
Back
A and C are hydrophilic, B is hydrophobic.
6.
FLASHCARD QUESTION
Front
Which of the following play a role in providing stability and fluidity at BOTH warm and cold temperatures? Saturated fatty acids, Unsaturated fatty acids, Cholesterol, Glycoproteins
Back
Cholesterol
7.
FLASHCARD QUESTION
Front
How do larger substances like amino acids, sugars, and ions enter and leave the cell?
Back
They pass through the membrane barrier with the help of protein channels, transporters, and/or pumps.
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