BIOL 31 - Ch 4 Mastering Questions

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

How do spirochetes and spirilla differ?

A gram-positive bacterium suddenly acquires resistance to the antibiotic methicillin. This trait most likely occurred due to acquisition of new genetic information through

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

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

Fimbriae and pili differ in that

Each of the following statements concerning the gram-positive cell wall is true EXCEPT -it is sensitive to lysozyme. -it is sensitive to penicillin. - it protects the cell in a hypertonic environment. - it maintains the shape of the cell. -it contains teichoic acids.

Which of the following statements about gram-negative cell walls is FALSE? They protect the cell in a hypotonic environment. They are sensitive to penicillin. Their Gram reaction is due to the outer membrane. They are toxic to humans. They have an extra outer layer composed of lipoproteins, lipopolysaccharides, and phospholipids.

You have isolated a motile, gram-positive cell with no visible nucleus. You can safely assume that the cell

Which of the following statements best describes what happens when a bacterial cell is placed in a solution containing 5% NaCl? Water will move into the cell. Sucrose will move into the cell from a higher to a lower concentration. Water will move out of the cell. The cell will undergo osmotic lysis. No change will result; the solution is isotonic.

By which of the following mechanisms can a cell transport a substance from a lower to a higher concentration?

Which of the following is NOT a typical characteristic of most bacterial plasma membranes? contains proteins contains cholesterol is selectively permeable site of energy production composed of a phospholipid bilayer

Which of the following statements is TRUE? Which of the following statements is TRUE? Endospores allow a cell to survive environmental changes by producing a dormant period with no growth. A cell can produce many endospores. A cell produces one endospore and keeps growing. Endospores are easily stained in a Gram stain. Endospores are for reproduction.

Antibiotics that target cell wall synthesis ultimately cause bacterial cell death as a result of

Which of the following is NOT part of the passive transport process? plasma membrane ATP concentration gradient transporter proteins aquaporins

In bacteria, photosynthetic pigments are found in

The difference between simple diffusion and facilitated diffusion is that facilitated diffusion

Where are phospholipids most likely found in a prokaryotic cell?

In a hypertonic solution, a bacterial cell will typically

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

The DNA found in most bacterial cells

Which of the following is NOT a functionally analogous pair? chloroplasts - thylakoids nucleus -nucleiod region 9+2 flagella - bacterial flagella mitochondria - prokaryotic plasma membrane cilia - pili

Which one of the following organisms has a cell wall? Which one of the following organisms has a cell wall? protoplasts animal cells mycoplasmas L forms fungi

Which of the following pairs is mismatched? endoplasmic reticulum internal transport Golgi complex secretion lysosome digestive enzymes centrosome food storage mitochondria ATP production

Which of the following organelles most closely resembles a prokaryotic cell?

Which of the following is NOT found or observed to occur in both mitochondria and prokaryotes? circular chromosome 70S ribosomes ATP-generating mechanism binary fission cell wall