Caribou are adapted to live in the Arctic, which means their cells are functional in extreme cold. Based on your knowledge of cell membranes, which prediction would you make about the lipid bilayer of caribou cells?

Proteins run on SDS-PAGE gels are separated based on their size (mass) because SDS maintains intrinsic charge and beta-mercaptoethanol preserves three-dimensional structure.

Cell biological experiments carried out in a dish are said to be “in vitro.”

For each of the following sentences, fill in the blanks with the best word or phrase selected from the provided lists. Not all words or phrases will be used; each word or phrase should be used only once. Action potential Active Transport Antiporters Aquaporins Electrochemical gradient Ligand-gated channels Mechanically-gated channels Membrane depolarization Membrane potential Osmosis Passive TransportSelectivity filters Symporters Uniporters Voltage-gated channels

The specificity of membrane function is predominantly due to its protein composition.

The non-transcribed regions of the genome (e.g. introns) will not be present in genomic libraries.

Phagocytosis and macropinocytosis allow a cell to engulf and degrade obsolete organelles or macromolecules from their own cytoplasm.

What are GEFs and GAPs? Define each acronym and briefly explain how they regulate Ras family GTPase activity.

Use the drop down menu to select the best word or phrase matching each description, or matching the colored structure in each image. Not all words or phrases will be used; each word or phrase will match only one image or description. [answer1] [answer2] [answer3]   A GTPase that forms a spiral around the neck of a budding clathrin-coated vesicle, constricting to allow membrane fusion and vesicle release. [answer4] Coiled-coil proteins that form long tethers with Rab binding sites, these are distinct on each Golgi stack to capture different vesicles. [answer5]

This family of proteins, which includes Sar1, inserts into the membrane where they bind coat proteins and cargo during coated vesicle formation.