Chapter 4

Which of the following statements is TRUE? A cell produces one endospore and keeps growing. A cell can produce many endospores. Endospores are for reproduction. Endospores allow a cell to survive environmental changes. Endospores are easily stained in a Gram stain.

Endospores allow a cell to survive environmental changes.

Which of the following statements is INCORRECT regarding prokaryotic cells? They lack a plasma membrane. They typically have a circular chromosome. They reproduce by binary fission. They lack membrane-enclosed organelles. Their DNA is not enclosed within a membrane.

They lack a plasma membrane.

Functions of the glycocalyx include all of the following EXCEPT increased virulence. biofilm formation. protection against dehydration. source of nutrition. binary fission.

binary fission.

Which structure acts like an "invisibility cloak" and protects bacteria from being phagocytized?

capsule

Which of the following is NOT a typical characteristic of most bacterial plasma membranes?

contains cholesterol

In Figure 4.3, which diagram of a cell wall is a gram-negative cell wall?

figure b

You have isolated a motile, gram-positive cell with no visible nucleus. You can safely assume that the cell lives in an extreme environment. has cilia. has 9 pairs + 2 flagella. has a cell wall. has a mitochondrion.

has a cell wall.

The DNA found in most bacterial cells is found in multiple copies. is circular in structure. utilizes histones for chromosomal packaging. is surrounded by a nuclear membrane. is linear in structure.

is circular in structure.

Which of the following terms best describes the cell in Figure 4.2?

lophotrichous flagella

Which one of the following pairs is mismatched? sulfur granules - energy reserve gas vacuoles - flotation metachromatic granules - phosphate storage lipid inclusions - energy reserve ribosomes - protein storage

ribosomes - protein storage