Newborns receive a single injection of vitamin k at birth because newborns receive a single injection of vitamin k at birth because newborns do not have enough mature gi flora to make vitamin k. breast milk is a poor source of vitamin k. the trauma of labor and delivery depletes the newborn's vitamin k stores. newborns cannot absorb any of the vitamin k from breast milk or formula.

The organelle pictured is found in cells of and is theorized to have once been an independent organism.

Molecular models of two different substances are shown below. in the molecule on the left, the oxygen atom pulls on electrons more strongly than the hydrogen atoms. in the molecule on the right, the two oxygen atoms pull on the shared electrons with the same strength. water molecule, h,o oxygen molecule, oz when the two substances are put in the same container, they do not attract each other. why does this happen? a. they both contain oxygen. b. one is polar and one is nonpolar. c . they are both polar. d. they contain different elements.

The first amino acid of a new polypeptide chain is