Microbiology- HW Ch.4

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Tumbles occur when

the flagella rotate clockwise

What type of bacterial cells would have only a single flagellum?

Monotrichous

Peritrichous bacteria make a run when

the flagella turn counterclockwise and become bundled.

Which of the following types of bacterial cells would have flagella located at only one end of the cell?

Lophotrichous and monotrichous

What structural part of a bacterial flagellum is composed of flagellin?

Filament

How are Gram-positive and Gram-negative flagella different?

A Gram-positive flagellum has only two rings in its basal body; Gram-negatives each have four.

The rings

anchor the flagellum to the cell wall.

The basal body is comprised of which structural component(s) of flagella?

Rod and Rings

Pathogenic bacteria

can be identified and classified by differences in their flagellar proteins.

Which of the following scenarios is an example of bacterial motility?

A bacterium moving towards a food source

Axial filaments are found on

spirochetes

Which of the following structures is NOT found in all bacteria?

Capsule

Which of the following is NOT a characteristic of prokaryotic cytoplasm?

Cytoplasmic streaming

Which of these statements is true regarding plasmids?

Prokaryotic plasmids may carry genes that provide antibiotic resistance to the cell.

Which of the following molecules is shared by both Gram-positive and Gram-negative organisms?

N-acetylmuramic acid

Amoxicillin is an antibiotic that inhibits the formation of peptide cross-links. Amoxicillin, therefore, would most likely inhibit the growth of __________.

both Gram-positive and Gram-negative organisms

Porins are present in ______________bacteria because, in these organisms, molecules entering the cell must pass through an extra layer of ___________.

Gram-negative; membrane

Why is no energy required in passive transport?T T

The concentration gradient drives the movement.

Once equilibrium is reached,

molecules move, but there is no net movement in a particular direction

Which statement regarding the structure or function of ribosomes is correct?

In eukaryotes, the ribosomes found in chloroplasts and mitochondria are 70S ribosomes, which are similar to the size of prokaryotic ribosomes.

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