Exam 6: Cell Membranes, Transport, and Communication

All steroid hormones are hydrophobic. Where would you expect the receptor proteins for hormones to be located?

One of the major functions of the plasma membrane is to

Active carrier proteins can transfer molecules into areas of higher concentration.

Passive carrier proteins

You observe a vesicle moving toward the plasma membrane from the inside of a cell. Once it reaches and fuses with the plasma membrane, you will most likely see an example of

Short-lived signaling molecules are most effective for

Cell-to-cell communication in humans involves the brain.

Muscle cells require high concentrations of calcium to function properly. As a result, these cells use _____ transport to move calcium from areas of low concentration outside the cell into the cytoplasm.

Which of the following are found in plants?

Which of the following statements about hormones is false?

Active carrier proteins are not found in the same cells as passive carrier proteins.

To coordinate the functions of specialized cells, those cells must be able to

Steroids are unable to cross the plasma membrane.

The figure below shows the movement of solutes across a plasma membrane in the direction indicated by the arrows. This movement across the membrane

Substances move into a cell by

Even though the amount of water in a cell remains constant in an isotonic solution, water is constantly moving both ways across the plasma membrane by the process of ___________.

Passive carrier molecules often require active carrier proteins to provide amino acids for transport.

The concentration of glucose inside of a cell is higher than the concentration outside of that cell, yet glucose continues to enter the cell. This is an example of

Osmoregulation refers to balancing water concentrations in organisms and cells.

Cell surface receptors of chemical messages are made of