BIOL 1408-Lesson 6 Quiz

The rate of diffusion is likely to decrease with ____.

A decrease in temperature.

Which type of molecule is most likely to diffuse easily across a cell membrane?

A small hydrophobic molecule.

Which transport method is used when a cell must move molecules against a concentration gradient?

Active transport

Which condition is responsible for the direction in which molecules diffuse?

Concentration gradient

Which statement best differentiates endocytosis from exocytosis?

Endocytosis takes in material and exocytosis releases materials.

Active and passive transport differ in that active transport requires ____.

Energy expenditure by the cell.

The condition in which molecules are evenly distributed within a region is called ____.

Equilibrium.

Stirring a drink after sugar is added to the liquid ____.

Facilitates equilibrium.

The lower concentration inside of a concentration gradient across a membrane is called ____.

Hypoosmotic

A drug that disassembles the cytoskeleton is applied to a sample of cells. Which of the following processes is most likely to be affected?

Intracellular transport

Organisms living in salty environments such as the ocean must protect their cells from ____.

Losing too much water to the environment

Osmosis may best be described as the ____.

Movement of water across a membrane.

A person accidentally waters a plant with salty water and notices that later the plant has begun to wilt. What condition best explains what has happened to the cells to make the plant wilt?

Plasmolysis.

Diffusion may be described as the ____.

Random movement of molecules.

Which term best describes the selective nature of cell membrane transport?

Semi-permeable

Molecules making up liquids and gases ____.

Spread throughout the available space.

Which statement best explains a cell under hypertonic conditions?

The cell contents shrink when placed in a hyperosmotic solution.

A potato cell is isolated and placed into pure water. Which of the following is most likely to occur?

The cell swells but does not burst.

What is likely to happen to a cell placed in hypotonic conditions?

The cell swells.

The energy for transport of molecules through facilitated diffusion is obtained from ____.

The existence of a favorable concentration gradient for the molecule being transported.

In facilitated diffusion, saturation occurs when ____.

There are not enough transporters available to transport all of the molecules.

Facilitated diffusion ____.

Uses protein carriers to transport molecules.

Intracellular transport best explains the following cell function: the movement of ____.

Vesicles from one organelle to another

An animal cell is placed into a solution containing 1% solute. If the animal cell contains 1% solute, which of the following statements is FALSE?

Water will not move across the membrane.

Imagine a cell that requires a high level of chloride ions for a specific function inside the endoplasmic reticulum. Identify the condition(s) in which this cell will require active transport to move chloride ions from the cytoplasm to the ER.

When ion concentration is either equal or lower in the cytoplasm.