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Cell Structure & Function

The basic structural and functional unit of the human body is

The cell

The watery (and salty) medium that surrounds a cell is known as

Extracellular fluid

Cell membranes are said to be

Selectively permeable

The movement if oxygen from an area of high concentration to an area of low concentration is an example of


The movement of water across a membrane from an area of low solute concentration to an area of higher solute concentration is known as


Water molecules and small ions enter a cell through

Channels in some cell membrane proteins

A solution that contains a lower solute concentration than the cytoplasm of a cell is called


Facilitated diffusion differs from ordinary diffusion in that facilitated diffusion

Limits the rate of molecular movement by the number of available carrier molecules

A process that requires cellular energy to move a substance against its concentration gradient is called

Active transport

What is the correct sequence for -DNA -tRNA -mRNA -protein

-DNA -mRNA -tRNA -protein

All of the triplet codes needed to produce a specific polypeptide chain are found in a


Hemolysis occurs when a blood cell is placed into

Hypotonic solution

If the amount of sodium ion in blood plasma increases

the blood osmotic pressure will increase

When sodium ions are moved across the cell membrane against the concentration gradient

Cellular ATP is used

The classes of membrane proteins that permit water and solutes to bypass the lipid portion of the cell membrane are

Channel proteins

The process that separates solid particles from liquids is known as


The term cancer refers to

-Any of various malignant neoplasms
-Neoplasms that have the tendency to metastasize to new sites
-An illness characterized by malignant cells

Which is NOT a function of the cell membrane?

Controlling movement into the nucleus

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