MCAT 2024-2025: THE ENDOCRINE
SYSTEM Exam 2026 Questions and
Answers
Peptide Hormones - Correct answer-Composed of amino acids and are derived
from larger precursor proteins that are cleaved during posttranslational
modification.
What is the chemical precursor for Peptide Hormones? - Correct answer-Amino
Acid
What is the chemical precursor for Steroid Hormones? - Correct answer-Cholestrol
What is the location of the receptor for Peptide Horomones? - Correct answer-
Extraceullular
What is the location of the receptor for Steroid Horomones? - Correct answer-
Intracellular or intranuclear
Peptide hormones method of travel in the bloodstream? - Correct answer-
Dissolves/travels freely
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, Steroid hormones method of travel in the bloodstream? - Correct answer-Binds to
carrier protein
Speed of onset and duration of action of Peptide Hormones? - Correct answer-
Quick & short-lived
Speed of onset and duration of action of Steroid Hormones? - Correct answer-Slow
& long-lived
How are amino acid-derivative hormones synthesized? - Correct answer-By
modifying amino acids
Direct Hormone - Correct answer-Secreted into bloodstream & travel to a target
tissue where they have direct effects
Tropic Hormone - Correct answer-Cause secretion of another hormone that then
travels to target tissue to cause an effect
Which two hormones are primarily involved in calcium homeostasis? - Correct
answer-Calcitonin and PTH (Parathyroid Hormone)
Where does the calcitonin hormone come from and what effect does it have on
blood calcium concentrations? - Correct answer-Calcitonin comes from the
parafollicular (C-) cells of the thyroid decreases blood calcium concentration
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
SYSTEM Exam 2026 Questions and
Answers
Peptide Hormones - Correct answer-Composed of amino acids and are derived
from larger precursor proteins that are cleaved during posttranslational
modification.
What is the chemical precursor for Peptide Hormones? - Correct answer-Amino
Acid
What is the chemical precursor for Steroid Hormones? - Correct answer-Cholestrol
What is the location of the receptor for Peptide Horomones? - Correct answer-
Extraceullular
What is the location of the receptor for Steroid Horomones? - Correct answer-
Intracellular or intranuclear
Peptide hormones method of travel in the bloodstream? - Correct answer-
Dissolves/travels freely
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, Steroid hormones method of travel in the bloodstream? - Correct answer-Binds to
carrier protein
Speed of onset and duration of action of Peptide Hormones? - Correct answer-
Quick & short-lived
Speed of onset and duration of action of Steroid Hormones? - Correct answer-Slow
& long-lived
How are amino acid-derivative hormones synthesized? - Correct answer-By
modifying amino acids
Direct Hormone - Correct answer-Secreted into bloodstream & travel to a target
tissue where they have direct effects
Tropic Hormone - Correct answer-Cause secretion of another hormone that then
travels to target tissue to cause an effect
Which two hormones are primarily involved in calcium homeostasis? - Correct
answer-Calcitonin and PTH (Parathyroid Hormone)
Where does the calcitonin hormone come from and what effect does it have on
blood calcium concentrations? - Correct answer-Calcitonin comes from the
parafollicular (C-) cells of the thyroid decreases blood calcium concentration
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
