In a test cross that has TT and Tt (where T = tall, t = short) as parents the phenotypic ratios of offspring could be:

This was one of Darwin’s main observations about the natural world after his trip on the HMS Beagle (boat):

While both the polyglutamate and monoglutamate forms of folate can be absorbed into the small intestine, the monoglutamate form is absorbed at a higher rate.

The nuclear retinoid X receptor (RXR) is used in the regulation of gene expression for both vitamin A and vitamin D.

Vitamin D receptors have been found in the which of the following tissues, suggesting that vitamin D can exert an effect on this tissue.

Health benefits associated with getting a sufficient amount of folic acid include…

The plasma concentration of which of the following forms of vitamin D is measured to determine the vitamin D status of a person?

Follicular hyperkeratosis is associated with a deficiency of vitamin C.

Because of differences in uptake between retinoids and carotenoids, the intake of vitamin A is given in units abbreviated as RAE.  What specifically does RAE stand for? 

What element is at the center of the corrin nucleus of cobalamin?