BIOS 105 Chapter 4 - otic cells? A) Their DNA is not enclosed within...

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BIOS 105 Chapter 4

• Which of the following is NOT a distinguishing characteristic of prokary-

otic cells?

• Their DNA is not enclosed within a membrane.
• They lack membrane-en- closed organelles.
• They have cell walls containing peptidoglycan.
• Their DNA is not associ- ated with histones.

E) They lack a plasma membrane.:

Answer E) They lack a plasma membrane.

• Which of the following statements about a gram-positive cell wall is

false?

• It maintains the shape of the cell.
• It is sensitive to lysozyme.
• It protects the cell in a hypertonic environment.
• It contains teichoic acids.

E) It is sensitive to penicillin.:

Answer C) It protects the cell in a hypertonic environment.

• Which of the following statements best describes what happens when a

bacterial cell is placed in a solution containing 5% NaCl?:

Answer water will move out of the cell wall

4. The best definition of osmotic pressure is:

Answer the force in which a solvent moves across a semi permeable membrane

• By which of the following mechanisms can a cell transport a substance

from a lower to a higher concentration?:

Answer active transport

• Which of the following is NOT a characteristic of the plasma membrane?
• Maintains cell shape
• Is composed of a phospholipid bilayer 1 / 2

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• Contains proteins
• Is the site of cell wall formation

E) Is selectively permeable:

Answer A) Maintains cell shape

• Which of the following have a cell wall?
• Protoplasts
• Fungi
• L forms
• Mycoplasmas

E) Animal cells:

Answer B) Fungi

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

E) A cell can produce many endospores.:

Answer B) Endospores allow a cell to survive environmental changes.

• Which of the following pairs is mismatched?
• Endoplasmic reticulum — internal transport
• Golgi complex — secretion
• Mitochondria — ATP production
• Centrosome — food storage

E) Lysosome — digestive enzymes:

Answer D) Centrosome — food storage

• Which of the following organelles most closely resembles a prokaryotic

cell?

• Nucleus
• Mitochondrion
• Golgi complex
• Vacuole
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