CELLULAR AND MOLECULAR BIOLOGYMIDTERM EXAM LATEST 2024 WITH UPDATED QUESTIONS AND DETAILED CORRECT ANSWERS WITH RATIONALES (ALREADY GRADED A+)

CELLULAR AND MOLECULAR
BIOLOGYMIDTERM EXAM LATEST 2024
WITH UPDATED QUESTIONS AND
DETAILED CORRECT ANSWERS WITH
RATIONALES (ALREADY GRADED A+)
There are 20 different amino acids. What makes one amino acid
different from another?
a. the number of carbon atoms in the "backbone" portion of each
amino acid
b. the presence or absence of carboxyl groups attached to an
alpha carbon
c. different side chains (R groups) attached to an alpha carbon
d. the number of hydrogen atoms in the "backbone" portion of
each amino acid
e. different alpha carbons - ANSWER-c
Which of the following statements regarding nucleotides is false?
a. nucleotides can be linked together to form nucleic acids
b. nucleotides have a nitrogenous base backbone
c. nucleotides contain nitrogenous bases
d. nucleotides contain sugar molecules
e. nucleotides contain phosphate groups - ANSWER-b
The tertiary structure of a polypeptide refers to
a. the presence of pleated sheets
b. the number of R groups it contains
c. the overall three-dimensional structure
d. the amino acids of which it is made
e. its size - ANSWER-c
2 | P a g e
Collagen is a protein found in bone tissue. Which of the following
best describes the molecular structure of collagen?
a. a group of six carbon atoms joined in a ring
b. a chain of amino acids folded and twisted into a molecule
c. a set of three fatty acids attached to a molecule of glycerol
d. a sequence nitrogenous bases attached to a sugar-phosphate
backbone - ANSWER-b
Cellulose and starch are examples of:
a. triglycerides
b. proteins
c. phospholipids
d. monosaccarides
e. carbohydrates - ANSWER-e
Many names for sugars end in the suffix ___ - ANSWER-ose
Which of the following statements about animal cell lipids is false?
a. steroids are lipids that function as signaling molecules
b. many lipids function as enzymes
c. phospholipids are important components of cell membranes
d. fats are a form of lipids that function to store energy
e. cholesterol is a type of lipid that is a component of cell
membranes and steroid hormones - ANSWER-b
Which of the following statements about dehydration synthesis is
false?
a. covalent bonds are formed between the monomers
b. one monomer loses a hydrogen atom, and the other loses a
hydroxyl group
c. electrons are shared between atoms of the joined monomers
d. H2O is formed as the monomers are joined
e. all of the above are true - ANSWER-e
In the double helix structure of nucleic acids, cytosine hydrogen
bonds to
3 | P a g e
a. deoxyribose
b. guanine
c. ribose
d adenine
e. thymine - ANSWER-b