Exam 3: The Cellular Level of Organization

The stage in a cell's life cycle in which the cell performs its normal functions and prepares for division is called

The triplet codes needed to specify a specific polypeptide chain are found in the

Which of the following best describes osmosis?

_______ cells are all of the cells of the body except the reproductive cells (sperm and oocytes).

The cytoplasm contains the fluid cytosol and the suspended

Breathing faster and deeper eliminates more carbon dioxide from the body than normal breathing.Under these circumstances,

Masses of insoluble material that are sometimes found in cytosol are known as

Which of the following transport processes always requires metabolic energy?

Microtubules have which of the following functions?

An alternate term for tumor is

In order to maintain cellular homeostasis,an exchange pump ejects ________ ions from the cell and imports ________ ions.

A carbohydrate that cannot cross plasma membranes is often administered to patients suffering blood loss is

Cell membranes are said to be ________ because they allow some substances to pass but not others.

A(n)________ is a mutant of a regulatory gene that causes cancer.

Assume that the transport of a particular amino acid across the plasma membrane is observed (1)to occur only down its concentration gradient and (2)to slow when a similar amino acid is added to the extracellular fluid.The movement of the amino acid through the membrane is most likely by

A mature red blood cell lacks a nucleus; therefore,it

Before a cell divides,its DNA must be replicated to

Renewal or modification of the cell membrane is a function of the

Figure 3-1 The Anatomy of a Representative Cell Use Figure 3-1 to answer the following questions: -The structure labeled "1" permits the cell to

If a cell lacked the enzyme DNA polymerase,it could not