BIO 3320 Quiz 1 Chemistry Test Bank (All 23 chapters complete, Questions and Answers with complete solutions

BIO 3320 Quiz 1 Chemistry
Test Bank (All 23 chapters
complete, Questions and
Answers with complete




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solutions


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BIO 3320




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.(When trying to determine which direction the Beta sheet runs) Which direction does the arrow
point? - ANSWER.Towards the C-Terminus.



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.1) Central alpha carbon connected via 4 covalent bonds: to - ANSWER.amino group, carboxyl group,
hydrogen group, R-group
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.A nucleosome is made up of an ______, which is 2 copies of each of H2A, H2B, H3 and H4. -
ANSWER.Octamer
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.About ____- bp form the linker between core particles - ANSWER.50
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.Absence of recognizable secondary structure is called a ______. - ANSWER.Random Coil



.Acetylation of lysine removes the positive charge, leaving the modified lysine _______. -
ANSWER.neutral



.activators have a _____ affinity state, are relaxed - ANSWER.high

,.Active Site - ANSWER.Region of an enzyme surface to which a substrate molecule binds in order to
undergo a catalyzed reaction



.Allosteric activators feed _____ - ANSWER.forward




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.Allosteric inhibitors feed ______ - ANSWER.back



.Allosteric protein - ANSWER.protein that changes its conformation (and often its activity) when it
binds to a regulatory molecule or when it is covalently modified




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.Allosteric regulation - ANSWER.Allosteric enzymes are multimeric proteins in which the catalytic site
is on different subunit from regulated site
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.Allosteric regulation has a conformation switch between ____ and _____ affinity states -
ANSWER.low, high
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.Alpha helix - ANSWER.Common folding pattern in proteins in which a linear sequence of amino
acids fold into a right-handed coil stabilized by internal hydrogen bonding between backbone atoms
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.Antibody - ANSWER.Protein produced by the immune system in response to a foreign molecule or
an invading microorganism



.As concentration increases, velocity ______ - ANSWER.increases
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.Beta sheet - ANSWER.Common structural motif in proteins in which different sections of the
polypeptide chain run alongside eachother and are joined together by hydrogen bonding between
atoms of the polypeptide backbone



.Binding site - ANSWER.The region on the surface of a protein that can interact with another
molecule through noncovalent bonding

, .Bringing molecule X from a low affinity to a high affinity will ________ - ANSWER.speed up a
reaction



.Can enzymes make a thermodynamically unfavorable reaction occur? - ANSWER.No




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.Cell Cycle - ANSWER.The orderly sequence of events by which a cell duplicats its contents and
divides into two



.Cell must make lots of ____ to keep proteins supplied - ANSWER.ribosomes




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.CENP-A - ANSWER.A variant of H3, directs heterochromatin formation at the CENTROMERE
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.Centromere - ANSWER.constricted region of a mitotic chromosome that holds sister chromatids



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.Chromatin - ANSWER.complex of DNA, histones, and non-histone proteins found in the nucleus of a
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eukaryotic cell



.Chromatin remodeling complexes accelerate ______ on DNA - ANSWER.nucleosome exchange
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.Chromosome - ANSWER.structure composed of a very long DNA molecule and associated proteins
that carries part (ora ll) of the hereditary information of an organism
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.Code-writers are most likely to bind to which part of the nucleosome? - ANSWER.The N-terminal
tails of each core histone



.Coenzyme - ANSWER.A small molecule that is tightly associated with a protein catalyst and
participates in the chemical reaction, often by forming a covalent bond to the substrate