48 Questions
What is the recommended dietary allowance (RDA) of Vitamin A for men?
700 µg RAE/d
Which form of Vitamin A is mainly stored in the liver and adipose tissue?
Retinol
What is the biological activity of β-carotene compared to retinol activity equivalent (RAE)?
~ 12µg = 1µg retinol/RAE
What is the main function of Vitamin A in the body?
Vision
What is the RAE of Vitamin A for lactating females?
950 µg/d
What is the efficiency of retinol absorption compared to carotene?
70-90%
Which food item provides the highest amount of Vitamin A per serving?
Beef liver, pan fried, 3 ounces
What is the primary source of Vitamin A for the body?
Carotenoids
What is the RAE of Vitamin A for males aged 11-14?
600 µg/d
What is the main metabolic function of Vitamin A?
Participates in the conversion of light into nerve impulses
What is the efficiency of carotene absorption compared to retinol?
5-60%
What is the main cause of Vitamin A deficiency?
Poor absorption
Which of the following is a symptom of vitamin A deficiency?
Impaired production of rhodopsin
What is the function of retinoic acid in gene expression?
Regulates the expression of structural proteins
Which of the following is a measure of vitamin A status?
Dark adaptation time
What is a potential consequence of vitamin A toxicity?
Liver and bone damage
Which receptors bind to the retinoic acid response element (RARE) on DNA?
$\alpha,\beta,\gamma$ retinoic acid receptor (RAR)
What is the direct measure of vitamin A status?
Liver biopsy
What is the main function of retinoic acid in epithelial cells?
Cell differentiation
What is the role of carotenoids in the body?
Function as antioxidants
What is the recommended upper limit of dietary intake for vitamin A in pregnant women?
3000-3300 µg
What is the measure used to assess vitamin A status after vitamin A ingestion?
Relative Dose Response test
What is a potential consequence of vitamin A deficiency?
Xerophthalmia
What is the role of vitamin A in embryonic development?
Cell differentiation
What is the main function of retinoic acid in gene expression?
Activates transcription
Which receptors bind to the retinoic acid response element (RARE) on DNA?
$\alpha,\beta,\gamma$ retinoic X receptor (RXR)
What is the measure used to assess vitamin A status after vitamin A ingestion?
Relative Dose Response test
What is the direct measure of vitamin A status?
Liver biopsy
What is a potential consequence of vitamin A toxicity?
Liver and bone damage
What is the main cause of Vitamin A deficiency?
Inadequate dietary intake
What is the role of carotenoids in the body?
Function as antioxidants
What is the main metabolic function of Vitamin A?
Regulates gene expression
What is the main function of Vitamin A in the body?
Vision
What is the primary source of Vitamin A for the body?
Fruits and vegetables
What is the efficiency of retinol absorption compared to carotene?
Higher
What is the efficiency of carotene absorption compared to retinol?
Lower
What is the retinol activity equivalent (RAE) for 1µg of β-carotene?
12µg
What is the primary form of Vitamin A stored in the liver and adipose tissue?
Retinol
What is the recommended dietary allowance (RDA) of Vitamin A for women?
600 µg
What is the main metabolic function of Vitamin A?
Participates in the conversion of light into nerve impulses
What is the measure used to assess vitamin A status after vitamin A ingestion?
Retinol Binding Protein
What is the efficiency of retinol absorption compared to carotene?
70-90%
What is the RAE of Vitamin A for males aged 18-64?
900 µg
What is a potential consequence of vitamin A deficiency?
Night blindness
What is the efficiency of carotene absorption compared to retinol?
Lower
What is the main function of retinoic acid in gene expression?
Regulates the expression of target genes
Which food item provides the highest amount of Vitamin A per serving?
Beef liver, pan fried, 3 ounces
What is the biological activity of β-carotene compared to retinol activity equivalent (RAE)?
Lower
Test your knowledge of Vitamin A and its importance in human nutrition with this quiz. Explore the different forms of Vitamin A, its role in addressing deficiencies, and its impact on public health.
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