When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other (like a snowman), the type of cleavage is called 

The number of animal species now known is about 

Which of the following statements about pantothenic acid is true?

Which of the following statements about Transcobalamin II (TCII) and vitamin B12 is correct?

Which of the following functions is vitamin C associated with?

Which of the following best describes the relationship between alcohol consumption and biotin?

Which of the following vitamins plays a role in the production of heme via its involvement in synthesis of the intermediate, aminolevulinic acid?

Which of the following is most effective in preventing neural tube defects during pregnancy?

Which of the following is NOT a role of vitamin B6 in the body?

Which type of anemia is primarily caused by folate deficiency?