Microbiology - chapter 5

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Microbiology
Chapter 5
exam questions - chapter 5
updated 6 years ago by marciacaroline
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1

What is the fate of pyruvic acid in an organism that uses aerobic respiration?

it is converted into acetyl CoA

2

Fatty acids are oxidized in

The Krebs cycle

3

Which of the following is the best definition of oxidative phosphorylation?

A proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate ATP

4

Photophosphorylation statements are

a) light liberates an electron from chlorophyll

b) the oxidation of carrier molecules releases energy

c) energy from oxidation reactions is used to generate ATP from ADP

D) It requires CO2

5

A strictly fermentative bacterium produces energy

by glycolysis only

6

In noncyclic photophosphorylation, 02 is released from

C6H12O6

7

Which is the best definition of fermentation

the partial oxidation of glucose with organic molecules serving as electron acceptors

8

In green and purple bacteria, electrons to reduce CO2 can come from

H2S

9

A bacteria are growing on a lipid medium that started at pH 7. The action of lipases case the pH of the medium to

decrease

10

Which of the following uses CO2 for carbon and H2 for energy?

chemoautotroph

11

Which of the following uses glucose for carbon and energy?

chemoheterotroph

12

Which of the following has bacteriochlorophylls and uses alcohols for carbon?

photoheterotroph

13

Cynobacteria are a type of

photoautotroph

14

Which of the following statements are true regarding production of ATP?

a) ATP is a common intermediate between catabolic and anabolic pathways

b) Anaerobic organisms are capable of generating ATP via respiration

c) ATP can be generated by the flow of protons across protein channels

15

Microorganisms that catabolize sugar into ethanol and hydrogen gas would most likely be categorized as

heterolactic fermenters

16

Which of the following statements regarding metabolism is TRUE?

a) Heat may be release in both anabolic and catabolic reactions

b) ATP is formed in catabolic reactions

c) ADP is formed in anabolic reactions

17

Which of the following statements regarding the Entner-Doudoroff pathway is True?

ATP is generated

18

If a cell is starved for ATP, which of the following pathways would most likely be shut down?

pentose phosphate pathway

19

Glycolysis pathway

a) two pyruvate molecules are generated

b) four ATP molecules are generated via substrate-level phosphorylation

c) two NADH molecules are generated

d) two molecules of water are generated

20

A bacterial culture grown in a glucose-peptide medium cases the pH increase. The bacterei are most likely

using the peptides

21

Gallionella bacteria can get energy from the reaction Fe2+ -- Fe3+. This reaction is an example of

oxidation

22

A urease test is used to identify Myobacterium tuberculosis because

M. tuberculosis produces urease

23

Catabolic reactions are generally degradative and hydrolytic?

True

24

The use of enzymes is necessary to increase activation energy requirements of a chemical reaction

False