Cell Structure [3] Flashcards
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
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
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
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
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
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
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
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
In general, swimming is performed with flagella, whereas gliding uses other cellular components such as pili.
A True
B False
A
Chemotaxis is a sensory response affecting the rotational direction of the flagellar motor.
A True
B False
A
Photoreceptors are analogous to chemoreceptors in that they are both proteinaceous sensors.
A True
B False
A
Mitochondria and chloroplasts have their own DNA and ribosomes, which supports the endosymbiosis hypothesis.
A True
B False
A
