microbiology quiz 2

in this illustration of electron transport chain, during aerobic respiration, where is water formed?

(third to right, bottom)

in this illustration of electron transport chain where is ATP produced?

(way right, bottom)

if bacteria have a doubling time of 20 min and you start with two bacterial cells, how many cells will you have after 1 hour?

16

thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. how many viable and culturable cells were in the original sample?

36 per milliliter

most bacteria grow best at pH?

7 (6.5-7.5)

which of the following is not a co-enzyme?

Mn++

which of the following is the best definition of aerobic respiration?

a sequence of carrier molecules with O2 as a final electron acceptor

in the figure, which sections of the graph illustrate a logarithmic change in cell numbers?

b & d) exponential phase & death phase

in the figure, which section (or sections) shows a growth phase where the number of cells dying equals the number of cells dividing?

c) stationary phase

which of the following compounds is NOT an enzyme?

coenzyme A

a culture medium consisting of agar, peptone, and beef heart extract is a?

complex medium

which of the following is an advantage of the standard plate count method?

determines the number of viable cells

the term aerotolerant anaerobe refers to an organism that?

does not use oxygen but tolerates it

which of the statements regarding enzymes is false?

enzymes slow down the reaction

true/false: all bacteria can perform photosynthesis

false

true/false: during aerobic respiration of glucose, the terminal electron acceptor is ATP

false

true/false: during the aerobic metabolism of glucose to CO2, the process that produces the most ATP for the cell is fermentation

false

true/false: in the molecule ATP, useful energy for the cell is stored as hydrogen bonds

false

true/false: light reactions of photosynthesis fix CO2

false

true/false: phototrophs use chemicals as energy source

false

true/false: the use of enzymes is necessary to increase the activation energy requirements of a chemical reaction

false

lactic acid is a product of?

fermentation

for optimal growth conditions halophiles require?

high salt

how would a noncompetitive inhibitor interfere with a reaction involving the enzyme shown?

it would bind to "b"

electron transport chain in animal cells is localized in?

mitochondria

enzymes are usually?

proteins

in this illustration of electron transport chain, the red dotted path is the flow of?

protons

electron transport chain is required for?

respiration

in a cyclic photophosphorylation, excited electrons ultimately?

return to chlorophyll

synthesis of ATP by oxidative phosphorylation occurs in?

the electron transport chain

a bacterium such as Pseudomonas uses nitrate (NO3) as a final electron acceptor in an electron transport system. all the below statements are true EXCEPT?

they require light

true/false: an isolated colony on a streak plate contains millions (or even billions) of identical cells all arising from one initial cell

true

true/false: both respiration and photosynthesis require the use of an electron transport chain

true

true/false: glycolysis is utilized by cells in both respiration and fermentation

true

true/false: in Calvin-Benson Cycle, CO2 is used to synthesize sugars

true

true/false: in general, ATP is generated in catabolic pathways and expended in anabolic pathways

true

true/false: most bacteria reproduce by binary fission

true

true/false: once an enzyme has converted substrates to products, the active site reverts back to its original form

true

true/false: oxidation is a loss of electrons by molecules

true

true/false: thermophiles prefer to grow at high temperatures

true