BCH 3025 ACTUAL EXAM 1|BRAND NEW EXAM QUESTIONS AND CORRECT ANSWERS ALL GRADED A+|GUARANTEED SUCCESS
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BCH 3025
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BCH 3025
BCH 3025 ACTUAL EXAM 1|BRAND NEW EXAM QUESTIONS AND CORRECT ANSWERS ALL GRADED A+|GUARANTEED SUCCESS
What type of covalent bond is responsible for holding together the secondary structure of proteins?
A) Disulfide bonds
D) Ionicbonds
B) Hydrogen bonds
E) None of the above
C) A...
BCH 3025 ACTUAL EXAM 1|BRAND
NEW EXAM QUESTIONS AND
CORRECT ANSWERS ALL GRADED
A+|GUARANTEED SUCCESS
What type of covalent bond is responsible for holding together the secondary
structure of proteins?
A) Disulfide bonds
D) Ionicbonds
B) Hydrogen bonds
E) None of the above
C) Amide bonds - ANSWER-✅
what are the most abundant biological elements and what is their tier? - ANSWER-
✅C, N, O, H, 1st tier
what are the four types of unit molecules and what are the characteristics of each? -
ANSWER-✅1) Amino Acids- contain an amino group and a carboxylic acid group,
contains at least two ionizable groups (+ and -)
2) Carbohydrates- C(H2O)n, multiple -OH groups, convertible between closed (ring)
and open forms
3) Nucleotides- 5 carbon sugar with N counting base ring, phosphate groups
4) Lipids- amphipathic (both polar and non polar), mostly hydrophobic
condensation is usually involved in what? - ANSWER-✅modular construction of
macromolecules
monomers in polymers are called what? - ANSWER-✅residues
name the three types of polymers and the bonds that form them. - ANSWER-✅1)
proteins- polymers of Amino Acids formed by peptide bonds/amino bonds
2) Nucleic acids- DNA or RNA, polymers of nucleotides formed by phophodiester
bonds
3)polysaccharides- polymers of carbs joined by glycosidic bonds
, What biological molecule cannot form polymers and why? - ANSWER-✅lipids
cannot form polymers because they lack a common functional group to be joined by.
G - ANSWER-✅Gibbs free energy, energy able to be used on a system for work, -
deltaG= spontaneous exergonic energy released ,+deltaG= non spontaneous
endergonic energy absorbed
H - ANSWER-✅Enthalpy, heat of system, += energy absorbed, -= heat released
T - ANSWER-✅entropy, disorder of the system
DeltaG=0 - ANSWER-✅equilibrium, living systems are never at equilibrium, they
work towards homeostasis which is a stable condition of non equilibrium where
deltaG is <0 (neg)
what type of reaction are most metabolic reactions? - ANSWER-✅most metabolic
reactions are oxidation-reduction reactions
what are the three domains of life? - ANSWER-✅bacteria, archaea and eukaryotes.
prokaryotes are bacteria and archaea
what is the principal of coupling reactions? - ANSWER-✅Spontaneous biochemical
reactions can be coupled with unfavorable reactions to net negative change in free
energy
metabolic reactions can be catalyzed by what? - ANSWER-✅mostly proteins, some
RNA
Amino functional group - ANSWER-✅NH3+
deprotonated carboxylate functional group - ANSWER-✅
carboxylate functional group - ANSWER-✅
amide functional group - ANSWER-✅
hydroxyl functional group - ANSWER-✅
Ester Functional group - ANSWER-✅
Ether functional group - ANSWER-✅
carbonyl functional group - ANSWER-✅
sulfhydryl functional group - ANSWER-✅
which of the following processes are spontaneous?
, a) a reaction that occurs with any size decrease in enthalpy and any size increase in
entropy
b) a reaction that occurs with a small increase in enthalpy and a large increase in
entropy
c) a reaction that occurs with a large decrease in enthalpy and a small decrease in
entropy
d) a reaction that occurs with any size increase in enthalpy and any size decrease in
entropy - ANSWER-✅A, B, and C
Atomic orbital - ANSWER-✅where we are most likely to find an electron. can
combine to form hybrid orbitals needed for molecular bonding interactions
Covalent bond - ANSWER-✅strongest bond, two atoms share valence electrons,
atomic orbitals overlap, shortest bond length-> strongest bond
ionic bond - ANSWER-✅electrons transferred from one atom to another, low
electronegativity of one atom is complemented by high electronegativity of another
atom, all ionic bonds have some degree of covalence none are PURELY ionic
van der waals - ANSWER-✅distance from nucleus to surface, orbitals as close as
possible without overlapping, no bond, dipole-dipole interactions-> between two
polar molecules, london dispersion forces-> between non polar molecules
Hydrogen bond - ANSWER-✅electronegative element covalently bonded to H atom
and electrostatically attracted to second H atom.
about what percent of the human body is water? - ANSWER-✅60%
what type of bonds is in one water molecule? how many sets of unpaired electron
are there? - ANSWER-✅two hydrogens covalently bonded to an oxygen atom. too
pairs of unpaired electrons causes water to be polar,unequal sharing of electrons
what makes a hydrogen bond strong or weak? - ANSWER-✅liner alignment makes a
hydrogen bond stronger, confers geometric constraints
how many other molecules can one H2O bind to by H bonding ? - ANSWER-✅4
properties of water: - ANSWER-✅highly cohesive, can bond to four other water
molecules at one time by H bonding,
what bonds are involved in Hydrogen bonding interaction? - ANSWER-✅covalent
and hydrogen bonds, H atom tugged between two electronegative molecules
order the bond interactions from strongest to weakest - ANSWER-✅1) covalent
bond
2) ionic bond
3) hydrogen bond
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