Active Transport

Active Transport

by Ms. Pelcman

Multiple Choice

Which best describes the structure of a cell's  plasma  membrane?

• proteins sandwiched between two layers of  phospholipids

• proteins embedded in two layers of  phospholipids

• phospholipids sandwiched between two layers of  proteins

• a layer of protein coating two layers of  phospholipids

Multiple Choice

The fluid-mosaic model of membrane structure refers  to   .

• the fluidity of phospholipids and the pattern of  proteins in the membrane

• the fluidity of proteins and the pattern of  phospholipids in the membrane

• the ability of proteins to switch sides in the membranes

• the fluidity of hydrophobic regions, proteins, and the  mosaic pattern of hydrophillic regions

Multiple Choice

Active transport moves molecules    .

• against their concentration gradients using energy

• against their concentration gradients without the use  of energy

• with their concentration gradients using energy

• with their concentration gradients without the use of  energy

Multiple Choice

Which protein can be used for both active and  passive  transport?

• carrier protein  

• channel protein

• any integral protein

• any transmembrane protein