Exam 3: Cell Structure and Function

You are a researcher specializing in cytology,specifically the cell structures of the skeletal muscle that moves the body.The instrument that you would use to see the fine detail within cells would be the

Plasma membranes allow certain molecules to pass,while blocking others.Membranes with this property are called

Before a cell can divide by mitosis,which of the following must occur?

Amino acids are carried to the ribosomes to be incorporated into polypeptide chains by which molecule?

The membrane proteins that are sensitive to extracellular materials are called

Two solutions are separated by a semipermeable membrane with the same properties as a cell membrane.Solution A is 5 percent glucose and solution B is 10 percent glucose.Under these circumstances,

Which of the following terms is used to define the structure that separates the contents of a human cell from its surrounding medium?

Palytoxin is a very potent toxin from a particular seaweed in Hawaii that locks the carrier proteins of the ion pump system of the cell in an open position.What result would this have on cell function?

The concentration of ________ determines the osmotic pressure of a solution.

Crenation occurs when a blood cell is placed in a(n)

Which of these is an example of carrier-mediated transport that does not require energy input?

When genes are switched off to allow a cell to restrict or specialize its functions,the process is called

Which enzyme is required for the synthesis of mRNA?

A process that requires ATP energy to move a substance independently of its concentration gradient is called

Which of the following is an example of membranous organelles?

Structure #1 represents the

Which substances can pass directly through the plasma membrane?

Synthesis of phospholipids is a function of the

In cells that are not dividing,chromosomes form a loose network of fibers known as

Figure 3-6 Nucleus Use Figure 3-6 to answer the following question: Identify the component of the nucleus in which rRNA synthesis and the assembly of ribosomal subunits occur.