Vitamin A: Introduction
Über den Vortrag
Der Vortrag „Vitamin A: Introduction“ von Kevin Ahern, PhD ist Bestandteil des Kurses „Vitamins“. Der Vortrag ist dabei in folgende Kapitel unterteilt:
- Vitamin D and Vitamin A
- Vitamin A - Rods and Cones
Quiz zum Vortrag
Which statement regarding vitamin A is true?
- It has 3 primary forms: retinol, retinal, and retinoic acid.
- It is water-soluble.
- It is stored in the kidney.
- It has 2 forms: retinol and retinal.
- Its primary form is retinol.
Which statement regarding vision is true?
- Double bonds play critical roles in light detection.
- Retinol is the light-sensing pigment.
- Light detection occurs as a result of rotation of a single bond.
- Triple bonds play critical roles in light detection.
- The absorption of a photon leads to the conversion of 11-trans retinal to 11-cis retinal.
Which statement regarding specialized retinal cells is true?
- They contain opsin, which holds retinal.
- They are devoid of opsin.
- They are devoid of photopigments.
- They include cones, which detect light.
- Stimulated optic nerve cells are unpolarized.
Which statement regarding rod cells is true?
- They become hyperpolarized when stimulated by light.
- They contain the protein opsin, which isomerizes in the light.
- They start out all-trans-retinal.
- They become depolarized when stimulated by light.
- Rod cells need at least 10 photons to detect light.
Which statement regarding vitamin A is correct?
- Vitamin A plays an important role in gene expression and cell differentiation during the developmental phase.
- Vitamin A does not play any role in human vision.
- Vitamin A plays an important role in hearing and taste.
- Vitamin A is not fat-soluble, and therefore, an excess of this vitamin can lead to toxicity.
- β-carotene blocks vitamin A synthesis.
Dozent des Vortrages Vitamin A: Introduction
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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