Biochemistry Lecture 3: Vitamins Overview
16 Questions
5 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which type of vitamins are readily excreted in the urine and toxicity is rare?

  • Water soluble vitamins (correct)
  • Vitamin A
  • A vitamins
  • Fat soluble vitamins

Which of the following is NOT a fatsoluble retinoid?

  • Retinal
  • Vitamin A
  • Retinol
  • Vitamin K (correct)

Where are significant quantities of fat soluble vitamins stored in the body?

  • Liver and adipose tissue (correct)
  • Bones
  • Muscles
  • Skin

What are the main functions of fatsoluble retinoids?

<p>Maintenance of epithelial tissues and immune function (A)</p> Signup and view all the answers

What is the role of retinoic acid in the body?

<p>Mediating most actions of the retinoids except for vision (B)</p> Signup and view all the answers

Which form of vitamin A predominates in nature?

<p>Vitamin A1 (B)</p> Signup and view all the answers

Where are retinol and carotenes absorbed in the body?

<p>Small intestine (C)</p> Signup and view all the answers

What is the daily requirement of vitamin A for adult males and females?

<p>3000 IU (C)</p> Signup and view all the answers

Which source provides three preformed compounds of vitamin A?

<p>Eggyolk (B)</p> Signup and view all the answers

Which organ stores retinol when absorbed in the body?

<p>Liver (A)</p> Signup and view all the answers

What do rod cells in the retina process?

<p>Black &amp; white image (B)</p> Signup and view all the answers

What is the primary function of the optic nerve?

<p>Converting light into electrical signals (B)</p> Signup and view all the answers

Which type of cells in the retina are specialized for color and detail vision in bright light?

<p>Cone cells (A)</p> Signup and view all the answers

What is the RDA for adult males and females for vitamin A?

<p>900mcg for males, 700mcg for females (A)</p> Signup and view all the answers

Which compound does not serve as a precursor of vitamin A2?

<p>Retinol (B)</p> Signup and view all the answers

What is contained in fresh water fish that distinguishes it from other animal sources?

<p>Vitamin A2 (C)</p> Signup and view all the answers

Study Notes

Vitamins and Toxicity

  • Water-soluble vitamins are readily excreted in the urine, and toxicity is rare.

Fatsoluble Vitamins

  • Fat-soluble vitamins are stored in significant quantities in the body's adipose tissue.

Fatsoluble Retinoids

  • The main functions of fatsoluble retinoids include regulating genes, differentiating cells, and maintaining epithelial tissues.
  • Retinoic acid plays a crucial role in the body by regulating gene expression and promoting cell differentiation.

Vitamin A

  • Vitamin A predominates in nature in its beta-carotene form.
  • Retinol and carotenes are absorbed in the small intestine.
  • The daily requirement of vitamin A for adult males is 900 μg/day and for adult females is 700 μg/day.
  • Liver and dairy products are sources that provide three preformed compounds of vitamin A.
  • The liver stores retinol when absorbed in the body.

Retina and Vision

  • Rod cells in the retina process dim light and peripheral vision.
  • The primary function of the optic nerve is to transmit visual information from the eye to the brain.
  • Cone cells in the retina are specialized for color and detail vision in bright light.

Vitamin A Requirements

  • The Recommended Dietary Allowance (RDA) for adult males is 900 μg/day and for adult females is 700 μg/day.

Vitamin A Precursors

  • Lycopene does not serve as a precursor of vitamin A2.

Freshwater Fish

  • Freshwater fish are distinguished from other animal sources by containing astaxanthin, a carotenoid pigment.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Description

This quiz covers an overview of vitamins, focusing on the definition and classification of vitamins. It includes information about water-soluble vitamins, their excretion, and rare toxicity, as well as fat-soluble vitamins, their absorption, and transportation.

More Like This

Biochemistry: Overview of Vitamins
10 questions
Biochemistry Vitamins and Minerals Quiz
22 questions
Biochemistry: Isoprenoids and Vitamins
40 questions
Use Quizgecko on...
Browser
Browser