In the successional sere on abandoned fields in the Piedmont of North Carolina, self-inhibition is a common mechanism determining the course of community development. In which of the following species is self-inhibition caused by growth inhibitors produced by decaying roots?
A) horseweed
B) aster
C) pine
D) all of the above
Ans: A) horseweed
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What is the coefficient of coincidence in this region?
In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males. The resulting trihybrid F1 females are testcrossed. The F2 are distributed as follows:
A) 0
B) 0.2
C) 0.4
D) 0.6
E) 0.8
What is the structure of a lymph capillary?
a. endothelial cells surrounded by collagen fibers b. endothelial cells surrounded by elastic fibers c. collagen fibers only d. elastic fibers only e. endothelial cells only
Vascular spasm, formation of a platelet plug, and coagulation are the three stages of ________
Fill in the blank(s) with correct word
The drug Humulin is a modified form of the human insulin protein that is used to treat diabetes
Describe the process that would allow a drug company to take the gene responsible for producing this protein and, using bacteria, produce large amounts of this human protein.