Final answer:
The statement that nails are made of connective tissue, are live tissue, or have parts called the head, neck, and root is incorrect. Nails are made of dead keratinocytes containing keratin and have parts including the root, plate, and free margin.
Step-by-step explanation:
Addressing the question "Which of the following is true of nails?", the correct answer is not listed in the options provided. However, the key facts about nails are that they are made up of dead keratinocytes that contain a protein called keratin. Nails are not connective tissue, they are a form of dead tissue unlike live tissues in the body, and their anatomical parts include the root, plate, and free margin, not the head, neck, and root. The nail bed is actually the part of the fingernail that is beneath the nail plate, and it is not correct to say it refers to the middle portion of the hard nail plate. Also, nails do not grow from the distal end to the proximal end; they grow in the opposite direction, from the proximal end near the root outwards to the distal end.