Bio 1100 Midterm 1 Exam Questions and Correct Answers
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Course
ECU BIO 1100
Institution
ECU BIO 1100
Which of the following statements is true? a) there are four macromolecules found in all cells b) macromolecules are formed by the formation of covalent bonds between building blocks c) the three-dimensional structure of proteins and nucleic acids is determined by noncovalent bonds d) nonpolar amin...
Bio 1100 Midterm 1 Exam Questions and
Correct Answers
Which of the following statements is true?
a) there are four macromolecules found in all cells
b) macromolecules are formed by the formation of covalent bonds between building
blocks
c) the three-dimensional structure of proteins and nucleic acids is determined by
noncovalent bonds
d) nonpolar amino acids tend to be found in the interior of proteins
e) all of the above are true ✅E) all of the above are true
Which of the following statements about the basic chemistry of cells are true?
a) all cells contain exactly the same proteins
b) all proteins fold up into similar three-dimensional shapes
c) all genetic instructions in cells are stored in the DNA
d) all organisms contain the same genes
e) all of the above are true ✅C) all genetic instructions in cells are stored in DNA
Proteins can be modified by reaction with acetate resulting in the addition of an acetyl
group to lysine side as shown below. the bond indicated in the box is: ✅A) a covalent
bond
DNA is negatively charged at physiological pH. A protein Z binds to DNA through
noncovalent ionic interactions involving lysines. What will be the effect of acetylation of
the lysine side chains (see figure above) in protein Z on the strength of this binding:
✅b) it should decrease it because the acetylated lysine will form fewer ionic interations
with the DNA
Membrane lipids are _____ molecules because one end of the molecule is _____ while
the other end is _____ ✅A) amphipathic/hydrophobic/hydrophilic
Cellular membranes or lipid bilayers are composed of molecules best described as:
✅B) amphipathic molecules held together by noncovalent, hydrophobic interactions
Chemical bonding occurs when _____ are shared between atoms. Sharing occurs to fill
the _____ shell: ✅C) electrons/valence
The assembly of atoms into the biological molecules is the result of bonding between
atoms. We use the valence of an atom to describe the number of covalent bonds it can
make. Please identify the correct valence for these common atoms used in biology
the valence of carbon is ✅D) 4
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