Tyrosine: Precursor of Thyroid Hormones
Über den Vortrag
Der Vortrag „Tyrosine: Precursor of Thyroid Hormones“ von Kevin Ahern, PhD ist Bestandteil des Kurses „Amino Acid Metabolism I (Texas A&M FOM II 2020 Exam Unit 1)“. Der Vortrag ist dabei in folgende Kapitel unterteilt:
- Tyrosine is a Precursor of Thyroid Hormones
- Tyrosine Metabolism
Quiz zum Vortrag
Which of the following is true regarding thyroid hormones?
- Thyroid hormones include thyroxine and triiodothyronine.
- They are synthesized within the thyroid cells.
- They are made from thyroglobulin, a precursor derived from glutamate.
- They are derived from the breakdown of carbohydrates.
- Thyromodulin is necessary for the synthesis of thyroid hormones.
Which of the following is true regarding thyroid hormone metabolism? Select all that apply.
- All deiodinases contain selenium.
- All thyroid hormones contain zinc.
- Thyroxine is the most active form.
- Triiodothyronine, with three iodines, is the most active form.
- Iodide ions are imported into thyroid cells from the bloodstream.
What is true regarding tyrosine catabolism dysfunction? Select all that apply.
- It is a factor in phenylketonuria.
- It can be managed by decreasing the intake of leucine.
- There are only two types of tyrosinemias.
- It is treated by reducing the intake of phenylalanine and tyrosine.
- It can result in black urine disease.
Which amino acid is the main precursor of thyroid hormones?
- Tyrosine
- Phenylalanine
- Methionine
- Selenocysteine
- Lysine
Which enzyme converts thyroxine into triiodothyronine?
- Deiodinase
- Tyrosine transaminase
- Aromatic acid decarboxylase
- Dopamine-β-hydroxylase
- 4-fumaryl acetoacetase
Which of the following statements is NOT true?
- Alkaptonuria is a rare inherited genetic disorder in which the body breaks down tyrosine at very rapid rates and leads to the accumulation of fumarate and acetoacetate in the body.
- Thyroglobulin protein participates in the synthesis of T4 and T3 hormones in the thyroid gland.
- The treatment of tyrosinemias and phenylketonuria involves the restriction of intake of amounts of tyrosine and phenylalanine in the individual’s diet.
- Iodide ions, essential for the production of thyroid hormones, are grabbed from the blood and transported into the thyroid follicular cell via sodium-iodide symport.
- There are two types of iodine-containing thyroid hormones: triiodothyronine (T3) and thyroxine (T4).
Which of the following pairs is not correctly associated?
- Phenylketonuria—4-fumarylacetoacetase deficiency
- Tyrosinemia II—tyrosine transaminase deficiency
- Tyrosinemia I—4-fumarylacetoacetase deficiency
- Tyrosinemia III—p-hydroxyphenylpyruvate dioxygenase deficiency
- Alkaptonuria—homogentisate 1,2-dioxidase deficiency
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Dozent des Vortrages Tyrosine: Precursor of Thyroid Hormones
Kevin Ahern, PhD
Dr. Kevin Ahern is a Professor in the Department of Biochemistry and Biophysics at Oregon State University (OSU), USA.
He obtained his PhD in Biochemistry from Oregon State University. Currently, he teaches courses for health sciences students at OSU.
He is co-author of three Open Educational electronic textbooks on Biochemistry and a Guide to Getting Into Medical School.
Due to his achievements, he earned OSU’s highest teaching recognition, the Elizabeth P. Ritchie Distinguished Professor Award in 2017.
Within Lecturio, Dr. Ahern teaches courses on Biochemistry and on "How to Get into Medical School”.
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