Multiple Choice
Ingested protein is always degraded to amino acids before absorption in the mature human small intestine, but nursing infants can absorb intact antibodies (large protein molecules) from breast milk. How might this difference in intestinal function be explained?
A) The tight junctions that prevent molecules from creeping through the epithelial lining of the small intestine are not yet fully developed in infants.
B) The anchoring junctions that interlock adjacent cells can be selectively activated or disabled in infants to permit the selective passage of specific substances.
C) Infants have gap junctions that open to the lumen of the small intestine and admit appropriately sized proteins.
D) Any of the above is a reasonable explanation.
Correct Answer:
Verified
Correct Answer:
Verified
Q8: One of the major functions of the
Q22: As a biological process,osmosis<br>A) requires an input
Q63: Imagine a cell needing an essential specific
Q66: A cell that is gaining water from
Q69: Which statement best describes the equilibrium condition
Q70: All steroid hormones are derived from<br>A)cholesterol.<br>B)progesterone.<br>C)testosterone.<br>D)adrenaline.
Q71: Which of the following would supply energy
Q72: Which of the following are found in
Q73: Epithelial tissue in animals provides a barrier
Q81: Plasmodesmata are not found in animal cells.