Exam 3: Cell Structure and Function

In an experiment in the laboratory, a small colored molecule is injected into one cell. Within minutes, the molecule has entered the adjacent cells. What type of junctions connect these cells?

Why type of junctions must there be between cells to form a barrier?

In developing embryos such as a chicken, what restores the amount of surface area needed for exchange requirements?

Viruses are not made up of cells. According to cell theory, this means what?

Which of the following can cross the plasma membrane because of its selective permeability?

Which of the following structures are present in both eukaryotes and prokaryotes?

Centrosomes are associated with

Only glucose can be used as an energy source in the human body.

What are the folds in mitochondrial membranes called?

Explain the functions of adhesion junctions, gap junctions, and tight junctions in human cells.

Because bacteria are prokaryotes, they do not have DNA.

Whose work proved conclusively that spontaneous generation of life from nonlife was not possible?

During a hurricane, salt water invades fresh water marshes causing many of the plants to die. The plants are killed because the salt water solution is __________________ to the plants, drawing water from their cells.

Angela would like to look at living algae from pond water. What type of equipment should she use?

The first day of football practice was rough on the squad. During practice the players complained of cramps and sore muscles. The reason for their complaints was that there was a __________________ build up in their muscles.

If you could remove all the phosphate in the cell, what would happen to the ATP cycle?

Which of the following is not a function of the plasma membrane?

Brett needs to distinguish two points that are 0.5 mm apart. What is the easiest way to do this?

Which organelle can be likened to a post office?

What is the function of cholesterol in the plasma membrane?