Microbiology # 5

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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

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