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MCAT BIOCHEMISTRY Questions with Detailed
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a-Helix
Ans: An element of Secondary structure.
Marked by clockwise coiling of Amino Acids around a central axis.
Acetyl-CoA
Ans: An important metabolic intermediate that links glycolysis and B-
oxidation to the citric acid cycle.
can also be converted into ketone bodies.
Activation
Ans: Conversion of a biomolecule to its active or usable form, such as
activating tRNA with an Amino Acid or activating a fatty acid with CoA to
form fatty acyl-CoA
Active Site
Ans: The Catalytically active portion of an enzyme.
Active Transport
Ans: The movement of a molecule against its concentration gradient with
energy investment.
primary active transport uses ATP, whereas secondary active transport uses a
favorable transport gradient of a different molecule.
Sunday, 02 March 2025
, Activity
Ans: Also sometimes called velocity or rate.
this is a measure of the catalytic activity of an enzyme.
it is often measured as a Vmax and may be analyzed after protein isolation.
Adenosine Triphosphate (ATP)
Ans: The Primary energy molecule of the body.
it releases energy by breaking the bond with terminal phosphate to form ADP
and an inorganic phosphate.
Aerobic Respiration
Ans: Energy-producing metabolic processes that require oxygen.
including
the citric acid, electron transport chain. and oxidative phosphorylation.
Allosteric Enzymes
Ans: Enzymes that experience changes in their conformation as a result of
interactions at site other than the active site called allosteric sites.
conformation changes may increase or decrease enzyme activity.
Alternative Splicing
Ans: The production of Multiple different but related mRNA molecules from a
single primary transcript of hnRNA.
Amino Acid
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