CH 4 end of chapter questions Multiple Choice
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10 Terms
Which of the following is not a distinguishing characteristic of prokaryotic cells?
- They usually have a single, circular chromosome.
- They have 70S ribosomes.
- They have cell walls containing peptidoglycan.
- Their DNA is not associated with histones.
-They lack a plasma membrane.
They lack a plasma membrane.
Which statement best describes what happens when a gram-positive bacterium is placed in distilled water and penicillin?
- No change will result; the solution is isotonic.
- Water will move into the cell.
- Water will move out of the cell.
- The cell will undergo osmotic lysis.
- Sucrose will move into the cell from an area of higher concentration to one of lower concentration.
The cell will undergo osmotic lysis
Which statement best describes what happens when a gram-negative bacterium is placed in distilled water and penicillin?
- No change will result; the solution is isotonic.
- Water will move into the cell.
- Water will move out of the cell.
- The cell will undergo osmotic lysis.
- Sucrose will move into the cell from an area of higher concentration to one of lower concentration.
Water will move into the cell
Which statement best describes what happens when a gram-positive bacterium is placed in an aqueous solution of lysozyme and 10% sucrose?
- No change will result; the solution is isotonic.
- Water will move into the cell.
- Water will move out of the cell.
- The cell will undergo osmotic lysis.
- Sucrose will move into the cell from an area of higher concentration to one of lower concentration.
No change will result; the solution is isotonic
Which of the following statements best describes what happens to a cell exposed to polymyxins that destroy phospholipids?
- In an isotonic solution, nothing will happen.
- In a hypotonic solution, the cell will lyse.
- Water will move into the cell.
- Intracellular contents will leak from the cell.
- Any of the above might happen.
Intracellular contents will leak from the cell.
Which of the following is false about fimbriae?
- They are composed of protein.
- They may be used for attachment.
- They are found on gram-negative cells.
- They are composed of pilin.
- They may be used for motility.
They may be used for motility
Which of the following pairs is mismatched?
- glycocalyx鈥攁dherence
- pili鈥攔eproduction
- cell wall鈥攖oxin
- cell wall鈥攑rotection
- plasma membrane鈥攖ransport
pili鈥攔eproduction
Which of the following pairs is mismatched?
- metachromatic granules鈥攕tored phosphates
- polysaccharide granules鈥攕tored starch
- lipid inclusions鈥攑oly-尾-hydroxybutyric acid
- sulfur granules鈥攅nergy reserve
- ribosomes鈥攑rotein storage
ribosomes鈥攑rotein storage
You have isolated a motile, gram-positive cell with no visible nucleus. You can assume this cell has
- ribosomes.
- mitochondria.
- an endoplasmic reticulum.
- a Golgi complex.
- all of the above
ribosomes
The antibiotic amphotericin B disrupts plasma membranes by combining with sterols; it will affect all of the following cells except
- animal cells.
- gram-negative bacterial cells.
- fungal cells.
- Mycoplasma cells.
- plant cells.
gram-negative bacterial cells