The laying of eggs has what type of analog in angiosperms?
A) endosperm breakdown
B) fusion of carpels into a fruit
C) fruit dispersal
D) seed coat hardening
C
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What are antigens?
A. non-self proteins or cells B. proteins on the surface of B-cell membranes C. proteins that consist of two light and two heavy chain polypeptide chains D. proteins on the surface of macrophage membranes E. proteins on the surface of T-cell membranes
If the tight junctions in the intestine were disrupted _____
A. intestinal cells could not attach to the extracellular matrix. B. intestinal cells could not attach to integral membrane proteins. C. small molecules would not be exchanged between neighboring intestinal cells. D. bacteria could move from the intestines to the bloodstream causing an infection. E. small molecules would not be able to move into cells lining the intestine.
The _____ should be contacted immediately if you or anyone accidentally consumes or comes in contact with a potentially toxic substance.
a. National Chemical Toxicity Center b. National Poison Control Center c. American Poison Chemical Society d. American Toxic Chemical Center
What is the main function of the nucleus?
A) To hold all of the DNA B) To hold all of the RNA C) To produce proteins D) To produce energy