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Magazine Problem 1
Cell membranes consist mainly of a ________ a. carbohydrate bilayer and proteins b. protein bilayer and phospholipids c. lipid bilayer and proteins
Problem 2
In a lipid bilayer, _______ of all the lipid molecules are sandwiched between all the ________. a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails
Problem 4
Most membrane functions are carried out by ________. a. proteins b. phospholipids c. nucleic acids d. hormones
Problem 5
Organelle membranes incorporate _________. a. transport proteins b. adhesion proteins c. recognition proteins d. all of the above
Problem 7
Diffusion is the movement of ions or molecules from a region where they are ________ (more/less) concentrated to (more/less) concentrated to _______ (more/less) concentrated.
Problem 8
Name one molecule that can readily diffuse across a lipid bilayer.
Problem 9
Some sodium ions cross a cell membrane through transport proteins that first must be activated by an energy boost. This is an example of _______ a. passive transport b. active transport c. facilitated diffusion d. a and \(c\)
Problem 10
Immerse a living cell in a hypotonic solution, and water will tend to _______. a. move into the cell b. move out of the cell c. show no net movement d. move in by endocytosis
Problem 11
Fluid pressure against a wall or cell membrane is called _________.
Problem 13
Put the following structures in order according to an exocytic trafficking pathway. a. plasma membrane b. Golgi bodies c. endoplasmic reticulum d. post-Golgi vesicles
