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biochem1a
biochem test
16
Biology
Undergraduate 4
09/23/2009

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Term
A dynamic steady state results when
Definition
the rate of intake or synthesis of a molecule equals the rate of its disappearance
Term
An open system is one
Definition
that exchanges both matter and energy with its surroundings
Term
What is true about the energy from sunlight
Definition
Photosynthetic cells use light energy to drive electrons from one molecule to another
Term
What is true about carbon bonding
Definition
Carbon atoms can form covalent bonds with up to four other atoms
Term
The difference between phototrophs and chemotrophs is
Definition
their energy source
Term
Both prokaryotic and eukaryotic cells possess which of the following
Definition
a plasma membrane
Term
How can thermodynamically unfavorable reactions, such as the synthesis of DNA and protein polymers, occur in cells
Definition
Cells couple thermodynamically unfavorable reactions to the hydrolysis of ATP
Term
Under what conditions is a carbon atom a chiral center
Definition
if it has four different substituent groups
Term
What is true about stereoisomers
Definition
They have different configurations
Term
what is not a macromolecule composed of many subunits
Definition
proteome
Term
Paralogs and orthologs differ in that
Definition
Paralogs exist in the same species and orthologs exist in different species
Term
Supramolecular complexes of proteins, nucleic acids, and polysaccharides are not held together by
Definition
covalent bonds
Term
What is not part of the current theories describing the evolution of multicellular organisms from inorganic molecules
Definition
Enzymes did not appear until after the first cells appeared
Term
[image]
The amino acid alanine shown, contains all of the following functional groups except
Definition
an ester group
Term

 

Which of the following is true about the two molecules shown

[image]

Definition
They are diastereomers of each other
Term

What is true about the two molecules shown

 

[image]

Definition
They are geometric isomers
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