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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Vascular spasm, formation of a platelet plug, and coagulation are the three stages of ________

Fill in the blank(s) with correct word

Biology & Microbiology

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.

Biology & Microbiology