CELLULAR AND MOLECULAR
BIOLOGYMIDTERM EXAM LATEST 2024 WITH
UPDATED QUESTIONS AND DETAILED CORRECT
ANSWERS WITH RATIONALES (ALREADY
GRADED A+)
Which of the following statements about hydrocarbons is false?
hydrocarbons can form straight, branched or ringed structures
hydrocarbons contain only carbon and hydrogen atoms
hydrocarbons consist of atoms linked by single and double bonds
hydrocarbons are composed of a linked chain of carbon atoms, called a
carbon skeleton
hydrocarbons are inorganic compounds - ANSWER-e
polysaccharides, nucleic acids, lipids, and proteins are similar in that they
are synthesized from monomers by the process of hydrolysis
are synthesized from monomers by dehydration reactions
all contain nitrogen in their monomer building blocks
are decomposed into their subunits by dehydration reactions
2 | P a g e
are decomposed into their subunits by the addition of a water molecule -
ANSWER-e
Cellulose differs from starch in that
starch is made of glucose monomers, whereas cellulose is made of fructose
monomers
cellulose is highly branched, whereas starch is unbranched
the monomers of cellulose are held together by covalent bonds, whereas the
monomers of starch are held together by hydrogen
starch is formed by plants and cellulose by animals
most animals cannot break down cellulose, whereas starch is easily digested
- ANSWER-e
Membrane phospholipids
have hydrophilic tails that face outward and are exposed to water
form a bilayer in which hydrophilic portions of the phoslipid face the inside of
the membrane
3 | P a g e
remain fluid because they are tightly packed against one another
have hydrophobic heads that face the center of the membrane and are
shielded from water
have a hydrophilic head that interacts with eh aqueous solutions inside and
outside the cell - ANSWER-e
Which of the following enzymes catalyzes the separation of a DNA
molecule?
helices
DNA polymerase
ligase
single-stranded binding protein
primase - ANSWER-a
DNA polymerase moves in which direction along the DNA template?
5' -> 3' along the single strand DNA template
3' -> 5' along the double stranded DNA template
5' -> 3' along the double stranded DNA template
3' -> 5' along the single stranded DNA template
none of the above - ANSWER-d
At which level of protein structure are interactions between the components
4 | P a g e
of the polypeptide backbone most important?
quaternary
primary
secondary
tertiary
all of the above - ANSWER-c
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