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25 terms

Microbiology # 5

STUDY
PLAY
The enzyme-regulated energy requiring reactions are mostly involved in
Anabolism
In living cells, the enzyme-regulated chemical reactions that release energy are generally involved in
Catabolism
Which organism is NOT correctly matched to its ENERGY source
Photoautotroph -- CO2
Which of the following uses glucose for carbon and energy?
Chemoheterotroph
Apoenzymes are inactive by themselves and must be activated by
Cofactors
Cyanobacteria are a type of
Photoautotroph
Why is ATP an important molecule in metabolism?
It provides energy coupling between exergonic and endergonic reactions
What term is used to describe the transfer of free energy from catabolic pathways to anabolic pathways?
energy coupling
which of the folloiwng statements is true concerning catabolic pathways?
THey are usually coupled with anabolic pathways to which they supply energy in the form of ATP
How would a noncompetitive inhibitor e interfere with a reaction involving the enzyme shown in Figure 5.3?
It would bind to b.
How would a competitive inhibitor d interfere with a reaction involving the enzyme shown in Figure 5.3?
It would bind to a.
For substrate c to get transformed into the end products, it would bind
to site a of the enzyme
A urease test is used to identify Myobacterium tuberculosis because
M. tuberculosis produces urease
How many molecules of ATP can be generated from the three phases in the respiration of one molecule of glucose in the Prokaryotes?
38
Reactants capable of interacting to form products n a chemical reaction must first overcome a thermodynamic barrier known as the reaction's
activation energy
which of the following statements regarding enzymes is ture
Enzymes increase the rate of a reaction
The active site of an enzyme is the region that
is inovolved in the catalytic reaction of the enyzme
The products of Catabolic reactions provide building blocks for
Anabolic Reactions
all of the following are the end-products of fermentation except?
Pyruvic Acid
Increasing the substrate concentration in an enzymatic reaction could overcome which of the following?
competitive inhibition
Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a
cofactor necessary for enzyme activity
How does a noncompetitive inhibitor decrease the rate of an enzyme reaction?
by changing the shape of an enzyme
The mechanism in which the end product of a matabolic pathway inhibits an ealier step in the pathway is known as
feedback inhibition
Assume you are growing a yeast culture that produces ethyl alcohol. The yeasts are growing well on the maltose medium but are not producing alcohol. The most likely explanation is
O2 is entering in to the medium in some way
A strictly fermentative bacterium produces energy
Ony by glycoysis