Chapter 4 pre-test
You have isolated a cell w/a peptidoglycan cell wall. What other structure can you safely assume the cell has?
A plasma membrane.
You are observing a Gram stain of rectangular-shaped microorganisms that are linked in a chain & stain purple. How would you describe these bacteria using the correct terminology for the cell shape & arrangement?
A Gram stain of a wound reveals purple, spherical-shaped bacteria that divide & remain attach in grapelike clusters. These are referred to as ____.
Which of the following statements does NOT provide evidence for the endosymbiotic theory?
Prokaryotes contain peptidoglycan in their cell walls.
Which of the following statements about a gram-negative cell wall is FALSE?
It contains teichoic acid.
Which of the following processes uses membrane proteins that act as channels or carriers allowing ions or large molecules to move across the plasma membrane without using energy?
Which of the following bacterial structures is necessary for chemotaxis?
Which of the following statements is true?
Endospores are extremely durable structures that can survive high temperatures.
Which one of the following pairs is correctly matched?
Golgi complex-->membrane formation & secretion of proteins.
Which of the following is NOT characteristic of the glycocalyx found in bacteria?
Creates a slimy, slippery coating that prevents bacteria form attaching to surfaces.
Which of the following eukaryotic cells do NOT contain a cell wall?
In prokaryotic cell, all of the following are functions of either the fimbriae or pili EXCEPT _______.
Which of the following membrane transport mechanisms takes place in eukaryotic cells but NOT in prokaryotic cells?
Within the cytoplasm of bacterial cells are reserve deposits where certain nutrients accumulate. These are called _____.
The nucleus of a eukaryotic cell differs from the nucleoid of a prokaryotic cell in all of the following ways EXCEPT which one?
The prokaryotic nucleoid contains DNA combined with histones. Histones are lacking in the eukaryotic nucleus.
Which of the following is true of bacteria that have atypical cell walls, such as those in the genus Mycoplasma?
Bacteria w/atypical cell walls are generally among the smallest bacteria that can reproduce outside a host cell.
Which of the following statements about ribosomes is FALSE?
Antibiotics that interfere w/protein synthesis harm both prokaryotic & eukaryotic ribosomes.
Which of the following is matched correctly?
Spheroplast--> gram-negative bacteria that are exposed to lysozyme but retain some of the outer membrane.
Spirochetes & spirilla are both spiral-shaped bacteria. However, they differ in that spirochtes have ________ & spirilla do not.
endoflagella (axial filaments)
Penicillin specifically interferes with peptidoglycan synthesis. Which of the following cells is most likely to be damaged by penicillin?
Gram-positive bacterial cells.