The spooling of DNA around histones creates particles called ________.
A. nucleosomes
B. nucleoli
C. euchromatin
D. proteosomes
Answer: A
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Intestinal crypts
A) only function in the absorption of nutrients. B) increase the surface area of the mucosa of the small intestine and produce new cells for the mucosa of the small intestine. C) only produce new cells for the mucosa of the small intestine. D) only carry products of digestion that will not pass through the walls of blood capillaries. E) only increase the surface area of the mucosa of the small intestine.
White blood cells differ from red blood cells because only they contain ________
A) a biconcave shape B) a nucleus and most organelles C) the ability to transport both oxygen and carbon dioxide D) the iron-containing molecule called hemoglobin E) cytoplasm
What is the whitish portion of the proximal nail body where blood vessels do not show through the layer of keratinized cells?
A) lunula B) nail body C) nail root D) eponychium
A process that requires energy to move a substance against its concentration gradient is called:
A) passive transport. B) facilitated transport. C) osmosis. D) active transport.