Your intestine is lined with individual cells. No fluids leak between these cells from the gut into your body. Why?
What will be an ideal response?
Answer: The intestinal cells are bound together by tight junctions
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Each of the following is considered a part of the body's second line of defense except:
A) fever. B) inflammation. C) interferons. D) lysozyme.
The 5' end of a DNA molecule can be chemically distinguished from the 3' end because there is a(n) __________ group at the 5' end and a(n) __________ group at the 3' end.
A) NH3; COOH B) PO4; SO4 C) OH; H D) PO4; OH E) none of the above
What is recombinant DNA technology? What are the safety issues related to recombinant DNA technology?
What will be an ideal response?
If one were to inject cytoplasm containing Bicoid into the middle of a Drosophila egg immediately prior to fertilization, the embryo would
A. develop normally. B. try to form posterior structures in the middle of its body. C. try to form anterior structures in the middle of its body. D. not develop at all.