Cell Structure [3] Flashcards Preview

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Flashcards in Cell Structure [3] Deck (12):
1

The terms "run" and "tumble" are generally associated with
A clustering of certain rod-shaped bacteria.
B eukaryotic cells.
C nutrient transport.
D chemotaxis.

D

2

Using phase contrast microscopy on a wet mount of live cells, you observe motile bacilli moving rapidly and randomly through the field of view, changing directions after a brief tumble and taking off in a different direction. These cells are exhibiting ________ motility.
A twitching
B swimming
C twitching or gliding
D gliding

B

3

Which of the following statements is FALSE?
A In flagellar motion, the basal body acts as a motor.
B The hook is the wider region at the base of the flagellum.
C A flagellar protein subunit is flagellin.
D Flagellar rotation generates ATP.

D

4

One of the many types of proteins found in the cytoplasmic membrane is involved in the chemotactic response and is called a
A hydrolytic enzyme.
B porin.
C binding protein.
D chemoreceptor.

D

5

All eukaryotes contain
A a nucleus, mitochondria, and hydrogenosomes.
B a membrane-enclosed nucleus.
C hydrogenosomes.
D mitochondria.

B
HYDROGENOSOMES: ARE MEMBRANE BOUND ORGANELLES WHICH LIKELY EVOLVED FROM MITOCHONDRIA AND PERFORM ANAEROBIC RESPIRATION USING AN ELECTRON TRANSPORT TRAIN TCA CYCLE SYSTEM

6

Based on the table of attributes given below, which of the following statements are FALSE about the two organisms?

Characteristic Bacterium A Bacterium B
Endospore formation yes no
Capsule no yes
Type IV pili yes no
Flagella no no
Morphology bacillus bacillus
A Bacterium A is more resistant to heat and ultraviolet light.
B Bacterium B is likely to exhibit motility.
C Bacterium B likely forms a slime layer better than Bacterium A.
D Both bacteria may attach to surfaces.

B

7

Type IV pili are involved in
A twitching motility.
B attachment of cells to surfaces.
C pathogenesis.
D attachment to surfaces, twitching motility, and pathogenesis.

D

8

Which list contains the correct components of a bacterial flagellum?
A filament, hook, basal body
B filament, anchor, basal body
C filament, anchor, rotator
D filament, hook, rotator

A

9

In general, swimming is performed with flagella, whereas gliding uses other cellular components such as pili.
A True
B False

A

10

Chemotaxis is a sensory response affecting the rotational direction of the flagellar motor.
A True
B False

A

11

Photoreceptors are analogous to chemoreceptors in that they are both proteinaceous sensors.
A True
B False

A

12

Mitochondria and chloroplasts have their own DNA and ribosomes, which supports the endosymbiosis hypothesis.
A True
B False

A