8/16/2019 Bacteria in the Digestive System Quiz Answers

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Bacteria in the Digestive System Quiz Answers

1. True or False: There are more bacterial cells in your body than

human cells.

true

. True or False: There could be as many as 1!""" s#ecies o$

bacteria in your digestive system.

true

%. &hich two vitamins are #roduced by bacteria in the gut'

vitamin B12 and vitamin K 

(. &hat ty#e o$ relationshi# do gut bacteria have with theirhuman hosts'

 The relationship that we have with the gut bacteria is mutualism, atype of symbiotic relationship.

). *ow many bacteria live in your digestive system'

It is estimated that 100 trillion bacteria live in the gut.

+. &hich bacteria hel# us digest #lant $ood'

a  Lactobacillus

b  Bacteroides

c   E. coli

d probiotic bacteria

,. Bacteria live in all areas o$ the gastrointestinal tract e-ce#t

the

a large intestine.

b small intestine.

c stomach.

d mouth.

8/16/2019 Bacteria in the Digestive System Quiz Answers

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. &hy are gut bacteria not attac/ed by the host immune

system'

a Because the bacteria appear as digestive system cells.

b Because the bacteria are covered sugars produced by the digestive

system cells.

c Because the immune system does not see these cells as foreign.

d all of the above

0. &hat is a role o$ digestive system bacteria'

a Brea! down "bers and some starches.

b Brea! down poisons in the stomach.

c #ontrol the growth of helpful bacteria.

d $ll of the above are roles of digestive system bacteria.

1". There are some #lant $oods that we cannot digest on our

own. *ow do bacteria hel# us digest these $oods'

a Bacteria produce en%ymes that digest proteins in plant cells.

b Bacteria produce en%ymes that digest lipids in plant cell walls.

c Bacteria produce en%ymes that digest carbohydrates in plant cell

walls.

d Bacteria produce en%ymes that digest carbohydrates in plant cell

membranes.