BIO 1A03 Test 2 Exam 2026 Questions
and Answers
one gene-one enzyme hypothesis - Correct answer-each gene contains the
information needed to make an enzyme
What did George Beadle and Edward Tatum research? - Correct answer-
Relationship between genes and proteins using the Neurospora Crassa
One gene-one enzyme hypothosis (Neuroposa Example) - Correct answer-
Neurospora can grow well on minimal medium (simple sugar, vitamins, inorganic
salts), and therefore it must have enzymes produced by a certain gene that that
transform these materials into amino acids and vitamins needed for growth.
Metabolic pathway of Arginine - Correct answer-Precursor, Ornithine, Citrulline,
Arginine
Adrian Srb and Norman Horowitz - Correct answer-Radiation treated neurospora
to create mutations in DNA code. They identified three mutants
Medium supplemented with arginine - Correct answer-POSITIVE CONTROL
(Growth)
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,Non-supplemented medium - Correct answer-No Growth
Exceptions to one gene one enzyme hypothesis - Correct answer-More than one
protein can be produced from a single gene - post translational modification of
proteins allows for the production of diverse proteins with specific roles
What allows of the synthesis of a polypeptide chain during translation? - Correct
answer-GTP-dependent factors
Where does the majority of glucose absorption take place? - Correct answer-
Microvilli cells of the small intestine
How many amino acids are translated from the insulin gene - Correct answer-110
amino acids
How many chains is a functional insulin protein made of? - Correct answer-2
(alpha and beta)
Alpha chain - Correct answer-21 amino acids
Beta chain - Correct answer-30 amino acids
Preproinsulin - Correct answer-Protein cleaved to become proinsulin which is
cleaved to become insulin
How do you get from preproinsulin to proinsulin - Correct answer-Cleavage of the
n-terminal signal sequence
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, Proinsulin to insulin - Correct answer-Undergoes folding, goes from rough ER to
Golgi, where cleavage of c-chain occurs
List postranslational modifications - Correct answer-Cleavage, phosphorylation,
methylation, acetylation
Phosporylation - Correct answer-The adding of a phospate to a molecule using
kinase enzyme
Receptors - Correct answer-Proteins that receive and interpret messages from
signalling molecules
dimerization - Correct answer-pairing of two receptor-hormone complexes
glucose transporters - Correct answer-proteins that assist in the transport of glucose
molecules across cell membranes
location of translation - Correct answer-cytoplasm
Number of anticodon loops on tRNA - Correct answer-3
Direction of Anticodon - Correct answer-3' to 5'
What is the point of attachment for the amino acid to the tRNA - Correct answer-
terminal adenine
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and Answers
one gene-one enzyme hypothesis - Correct answer-each gene contains the
information needed to make an enzyme
What did George Beadle and Edward Tatum research? - Correct answer-
Relationship between genes and proteins using the Neurospora Crassa
One gene-one enzyme hypothosis (Neuroposa Example) - Correct answer-
Neurospora can grow well on minimal medium (simple sugar, vitamins, inorganic
salts), and therefore it must have enzymes produced by a certain gene that that
transform these materials into amino acids and vitamins needed for growth.
Metabolic pathway of Arginine - Correct answer-Precursor, Ornithine, Citrulline,
Arginine
Adrian Srb and Norman Horowitz - Correct answer-Radiation treated neurospora
to create mutations in DNA code. They identified three mutants
Medium supplemented with arginine - Correct answer-POSITIVE CONTROL
(Growth)
©COPYRIGHT 2025, ALL RIGHTS RESERVE 1
,Non-supplemented medium - Correct answer-No Growth
Exceptions to one gene one enzyme hypothesis - Correct answer-More than one
protein can be produced from a single gene - post translational modification of
proteins allows for the production of diverse proteins with specific roles
What allows of the synthesis of a polypeptide chain during translation? - Correct
answer-GTP-dependent factors
Where does the majority of glucose absorption take place? - Correct answer-
Microvilli cells of the small intestine
How many amino acids are translated from the insulin gene - Correct answer-110
amino acids
How many chains is a functional insulin protein made of? - Correct answer-2
(alpha and beta)
Alpha chain - Correct answer-21 amino acids
Beta chain - Correct answer-30 amino acids
Preproinsulin - Correct answer-Protein cleaved to become proinsulin which is
cleaved to become insulin
How do you get from preproinsulin to proinsulin - Correct answer-Cleavage of the
n-terminal signal sequence
©COPYRIGHT 2025, ALL RIGHTS RESERVE 2
, Proinsulin to insulin - Correct answer-Undergoes folding, goes from rough ER to
Golgi, where cleavage of c-chain occurs
List postranslational modifications - Correct answer-Cleavage, phosphorylation,
methylation, acetylation
Phosporylation - Correct answer-The adding of a phospate to a molecule using
kinase enzyme
Receptors - Correct answer-Proteins that receive and interpret messages from
signalling molecules
dimerization - Correct answer-pairing of two receptor-hormone complexes
glucose transporters - Correct answer-proteins that assist in the transport of glucose
molecules across cell membranes
location of translation - Correct answer-cytoplasm
Number of anticodon loops on tRNA - Correct answer-3
Direction of Anticodon - Correct answer-3' to 5'
What is the point of attachment for the amino acid to the tRNA - Correct answer-
terminal adenine
©COPYRIGHT 2025, ALL RIGHTS RESERVE 3
