ECPI BIO 111 Chap 3 CERTIFICATION GUIDE
FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
Changing a single amino acid in a protein consisting of 433 amino acids would - always
alter the primary structure of the protein and sometimes alter its tertiary structure or function
If cells are grown in a medium containing radioactive 32P, which of these molecules will be
radioactively labeled? - nucleic acids
How many peptide bonds are present in a polypeptide that contains 45 amino acids? - 44
If a DNA sample were composed of 15% adenine, what would be the percentage of guanine? -
35
If a DNA sample were composed of 15% adenine, what would be the percentage of thymine? -
15
Which of the following large biological molecules will self-assemble into a bi layer when mixed
with water? - phospholipids
Lactase is an enzyme composed of a single polypeptide that hydrolyzes the disaccharide lactose
to produce monosaccharides. The optimal pH for lactase activity is 6. Transfer of lactase to pH 5
results in a substantial decrease in enzyme activity, likely due to the disruption of - the
secondary and tertiary structure of the enzyme.
Quartery - structure is the result of two or more protein subunits assembling to form a
larger, biologically active protein complex.
Secondary - structure describes the alpha-helices and beta-sheets that are formed by
hydrogen bonding between backbone atoms located near each other in the polypeptide chain.
Primary - structure is the sequence of amino acids in a protein.
FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
Changing a single amino acid in a protein consisting of 433 amino acids would - always
alter the primary structure of the protein and sometimes alter its tertiary structure or function
If cells are grown in a medium containing radioactive 32P, which of these molecules will be
radioactively labeled? - nucleic acids
How many peptide bonds are present in a polypeptide that contains 45 amino acids? - 44
If a DNA sample were composed of 15% adenine, what would be the percentage of guanine? -
35
If a DNA sample were composed of 15% adenine, what would be the percentage of thymine? -
15
Which of the following large biological molecules will self-assemble into a bi layer when mixed
with water? - phospholipids
Lactase is an enzyme composed of a single polypeptide that hydrolyzes the disaccharide lactose
to produce monosaccharides. The optimal pH for lactase activity is 6. Transfer of lactase to pH 5
results in a substantial decrease in enzyme activity, likely due to the disruption of - the
secondary and tertiary structure of the enzyme.
Quartery - structure is the result of two or more protein subunits assembling to form a
larger, biologically active protein complex.
Secondary - structure describes the alpha-helices and beta-sheets that are formed by
hydrogen bonding between backbone atoms located near each other in the polypeptide chain.
Primary - structure is the sequence of amino acids in a protein.
