BIO 240 Quiz 3

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33 Terms

1

Bacteria are usually autotrophs. (T/F)

True

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2

What 2 other organisms are also autotrophs?

algae and plants

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3

Some bacteria can also be heterotrophs. (T/F)

true

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4

relationship where bacteria and man both benefit from each other

symbiosis

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5

relationship where bacteria may benefit and man receives no real benefit or harm

commensalism

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6

several species of bacteria accomplish together what neither bacterium could accomplish individually

synergism

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7

an organism may be pathogenic to a host if the host's immune system is compromised; often part of host's normal flora

opportunism

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8

relationship where one organism benefits and another is harmed

parasitism

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9

bacteria that grow best at cold temperatures

psychrophiles

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10

bacteria that grow best at moderate temperature

mesophiles

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11

bacteria that grow best at warm temperatures

thermphiles

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12

bacteria that grow in extremely warm/hot temperatures

extreme thermophiles

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13

some organisms that are not thermophiles, but can survive (not necessarily grow) in high temperatures

thermoduric organism

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14

Which organism would likely be most human pathogens?

mesophiles

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15

Would psychrophiles likely be pathogenic to humans?

no, we are too warm

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16

How do we protect our food from becoming a reservoir for mesophilic bacteria that may make us ill?

cooling or heating

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17

Would boiling be an effective method of killing ALL thermophiles?

no, we must use an autoclave

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18

___ require an environment that contains Oxygen

aerobes (obligate)

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19

_____ do NOT require an oxygen environment for growth or reproduction

anaerobes (obligate)

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20

Type of anaerobe that requires absolutely NO Oxygen

Strict anaerobe

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21

___ _____ can grow either in the presence or absence of Oxygen

Facultative anaerobes

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22

What category of the most clinically significant bacteria fall under?

facultative anaerobes

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23

____ grow best in an Oxygen-limited environment

microaerophiles

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24

Most bacteria have an internal pH of approximately _

7

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25

Most bacteria grow best at a pH of _ to _

6;8

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26

What is the exception to bacteria growth pH?

Helicobacter pylori

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27

Bacteria can't grow well in hyperosmotic environments. (T/F)

True

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28

Hugh sugar or salt content tends to draw water out of the organism, thereby ___

Dehydrating

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29

"Salt lover"

Halophiles

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30

What is the one common organism that can survive in salty environments?

Staphylococcus aureus

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31

In mannitol salt agar, it is selective for the growth of the genus:

Staphylococcus

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32

Yellow growth on mannitol salt agar is

Staphylococcus aureus

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33

Any other staphylococcus other than aureus turns the mannitol salt agar ___

Pink

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