Which of these are functions of membrane proteins 1 to send signals across the cell membrane 2 to produce the lipids that make up the membrane 3 to serve as identification for the cell 4 to help molecules across the membrane

Which is NOT a general function of the cellular cytoskeleton?     Regulation of intracellular transport     Regulation of cell motility and cellular contraction     Assembly of DNA into chromatin     Separation of the chromosomes during mitosis     Structural support for the cell

Descibe each process and how it transports across plasma membrane. Selectively permeable Carrier-mediated vs. noncarrier-mediated transport Passive vs. active transport

The diagram below shows three different proteins embedded in a cell membrane, as well as the concentration gradient surrounding the cell high concentration channel protein carrier protein lipid bilayer 1 21 3 low concentration Which of the following statements correctly states the process shown in the diagram? O The process labeled 1 shows how cells can easily move molecules with the concentration gradient using high energy molecules. The process labeled 2 shows how cells move molecules against the co entration gradient without needing hic energy molecules The process labeled 3 shows how cells use energy to facilitate the active transport of molecules against the concentration gradient All three processes show how molecules freely move in and out of the cell regardless of the concentration gradient or available en Previous

Item17       Item 17 Which is a passive transport process? Multiple Choice   Phagocytosis   Pinocytosis   Receptor-mediated endocytosis   Osmosis   Ion pump Item18       Item 18 The type of vesicular transport by which large molecules or large amounts of substances are secreted from a cell is _________. Fill in the blank Fill in the blank   Item19       Item 19 Materials tend to move less rapidly when their concentrations are significantly different between two compartments. Group startsTrue or False   Item19       Item20       Item 20   As potassium diffuses down its concentration gradient, it moves out of the cell. However, this movement is resisted by the accumulating negative charge outside the cell.   Group startsTrue or False

A cell junction is connecting the cell's cytoskeleton to the basement membrane. This is a ______ cell junction which uses the ____ adhesion molecule.     desmisome ; integrin     desmisome ; cadherin     hemi-desmisome ; integrin     hemi-desmisome ; cadherin

Which one of the following will have the most difficulty in crossing the plasma membrane?     Na+ ions     oxygen     "small, nonpolar, hydrophobic molecules such as fatty acids"     carbon dioxide

In vertebrates, which cell-cell junction allows for direct chemical communication between adjacent cell cytoplasms, without contact with the extracellular fluid, and is composed of the transmembrane protein connexin? O Desmosome O Gap junctions O Adherens junctions O Tight junctions O Focal adhesions

100% Normal text Verdana 10 %3D Which of the following would allow for communication between neighboring cells, so that the involved cell's could cdordinate a specific activity? desmosomes and gap junctions desmosomes tight junctions gap junctions étv4 Aa ok Pro

The non polar portion of the plasma membrane are composed of:     phosphate headgroups     phosphate tails     fatty acid headgroups     fatty acid tails