Cell Biology TTU - Exam 1 Questions
& Answers (Grade A+)
"Three-dimensional relationship of the different polypeptide chains
in a multi-subunit protein or protein complex" -
correct answer ✅Quaternary structure
primary structure -
correct answer ✅The linear sequence of amino acids within a
protein
Ex: Hemoglobin
Secondary Structure -
correct answer ✅Alpha-helices and beta-sheets; which are held
together by hydrogen bonds on the polypeptide backbone
Tertiary Structure -
correct answer ✅how it folds in on itself (side-chain interactions)
Which one of the following properties of an enzyme is responsible
for its saturation behavior; that is. a maximum rate insensitive to
further increase in substrate concentration?
(i) The enzyme does not change the overall equilibrium constant for
a reaction.
,Cell Biology TTU - Exam 1 Questions
& Answers (Grade A+)
(ii) The enzyme lowers the activation energy of a chemical reaction.
(iii) The enzyme is a catalyst that is not consumed by the reaction.
(iv) The enzyme has a fixed number of active sites where the
substrate binds
(v) The product of the enzyme reaction usually inhibits the enzyme.
-
correct answer ✅(iv) The enzyme has a fixed number of active
sites where the substrate binds; b/c the enzyme has a fixed number
of active sites when full it can't take anymore.
ex: Ice tea.
Region of an enzyme surface to which a substrate molecule binds in
order to undergo a catalyzed reaction is called? -
correct answer ✅Active Site
Rate-limiting structure that forms transiently in the course of a
chemical reaction and has the highest free energy of any reaction
intermediate is called a -
correct answer ✅Transition State
Protein that changes its conformation (and often its activity) when
it binds a regulatory molecule or when it is covalently modified is
, Cell Biology TTU - Exam 1 Questions
& Answers (Grade A+)
called -
correct answer ✅Allosteric Protein
Most of the interactions between macromolecules could be
mediated just as well by covalent bonds as by non-covalent bonds.
(TRUE or FALSE, and then explain) -
correct answer ✅False. Many of the functions that
macromolecules perform rely on their ability to associate and
dissociate readily, which would not be possible if they were linked
by covalent bonds. By linking their macromolecules non-covalently,
cells can, for example, quickly remodel their interior when they
move or divide, and easily transport components from one
organelle to another
-Noted that some macromolecules are linked by covalent bonds,
but only when extreme structural stability is required, such as
bacteria, fungi, plants, and the extracellular matrix.
Each strand in a β sheet is a helix with two amino acids per turn.
(TRUE or FALSE, and then explain) -
correct answer ✅True; beta sheets are rotated so that not
everything is on one side.
Alternately positioned above and below the sheet.
& Answers (Grade A+)
"Three-dimensional relationship of the different polypeptide chains
in a multi-subunit protein or protein complex" -
correct answer ✅Quaternary structure
primary structure -
correct answer ✅The linear sequence of amino acids within a
protein
Ex: Hemoglobin
Secondary Structure -
correct answer ✅Alpha-helices and beta-sheets; which are held
together by hydrogen bonds on the polypeptide backbone
Tertiary Structure -
correct answer ✅how it folds in on itself (side-chain interactions)
Which one of the following properties of an enzyme is responsible
for its saturation behavior; that is. a maximum rate insensitive to
further increase in substrate concentration?
(i) The enzyme does not change the overall equilibrium constant for
a reaction.
,Cell Biology TTU - Exam 1 Questions
& Answers (Grade A+)
(ii) The enzyme lowers the activation energy of a chemical reaction.
(iii) The enzyme is a catalyst that is not consumed by the reaction.
(iv) The enzyme has a fixed number of active sites where the
substrate binds
(v) The product of the enzyme reaction usually inhibits the enzyme.
-
correct answer ✅(iv) The enzyme has a fixed number of active
sites where the substrate binds; b/c the enzyme has a fixed number
of active sites when full it can't take anymore.
ex: Ice tea.
Region of an enzyme surface to which a substrate molecule binds in
order to undergo a catalyzed reaction is called? -
correct answer ✅Active Site
Rate-limiting structure that forms transiently in the course of a
chemical reaction and has the highest free energy of any reaction
intermediate is called a -
correct answer ✅Transition State
Protein that changes its conformation (and often its activity) when
it binds a regulatory molecule or when it is covalently modified is
, Cell Biology TTU - Exam 1 Questions
& Answers (Grade A+)
called -
correct answer ✅Allosteric Protein
Most of the interactions between macromolecules could be
mediated just as well by covalent bonds as by non-covalent bonds.
(TRUE or FALSE, and then explain) -
correct answer ✅False. Many of the functions that
macromolecules perform rely on their ability to associate and
dissociate readily, which would not be possible if they were linked
by covalent bonds. By linking their macromolecules non-covalently,
cells can, for example, quickly remodel their interior when they
move or divide, and easily transport components from one
organelle to another
-Noted that some macromolecules are linked by covalent bonds,
but only when extreme structural stability is required, such as
bacteria, fungi, plants, and the extracellular matrix.
Each strand in a β sheet is a helix with two amino acids per turn.
(TRUE or FALSE, and then explain) -
correct answer ✅True; beta sheets are rotated so that not
everything is on one side.
Alternately positioned above and below the sheet.
