Exam 4: Membrane Structure and Function

Our body recognizes the foreign nature of a parasite or disease agent and we soon build up antibodies.A few parasites can change their identity to evade our immune system.How could cells do this on a regular basis?

Certain individuals with a Y chromosome develop into females because testosterone is not able to induce the formation of male sexual characteristics.This is most likely due to a defect in

The same signaling molecule that binds to the receptor on the outside of the cell is used to alter gene expression in the nucleus.

The pressure that is generated when water flows through a differentially permeable membrane is termed

Which component of the extracellualr matrix is responsible for forming proteoglycans?

Which of the following statements is true regarding the inside and outside of the plasma membrane?

The plasma membrane is composed of

When an intestinal cell ingests substances inside very small vesicles that can only be seen with an electron microscope,this is

If 0.9% NaCl were isotonic to a cell,then

When you cut into most active plant tissue,water appears almost immediately because plant cells contain

The term hypertonic means

One way to determine whether something is being actively transported across a membrane is to compare its rate of transport with and without a chemical that blocks ATP production.

An isotonic solution means that the solute concentration outside the cell

In certain cancerous cells,the cell divides continuously even in the absence of a growth factor (signaling molecule)that indicates the cell should divide.Which of the following could NOT explain this?

The number of mitochondria in a cell would be a general indicator of the extent of

Which is true of facilitated transport by carrier proteins?

Once a solute and a solvent are evenly distributed in a solution,they will

Macrophages,a type of white blood cells,are able to remove bacteria from our bloodstream and tissues by

Which intercellular junction allows for the rapid movement of small molecules or ions to flow from one animal cell to the next?

What will happen to dye crystals if placed in the bottom of a beaker of water over a long period of time?