_____ is believed to be the most important serine protease, because its ability to degrade several matrix components giving cancer cells the ability to migrate.
a. plasminogen
b. plasmin
c. fibronectin
d. laminin
Ans: b. plasmin
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Each branch point or node of a phylogenetic tree represents:
A. an environmental pressure for evolution. B. a mutational event that leads to two species. C. common ancestor to two connected branches. D. the beginning of a new domain. E. the point when life started on earth.
Answer the following statements true (T) or false (F)
1. Humans exert top-down pressures on white-tail deer. 2. Using insects from the original homeland to control invasive weeds is a form of biological control. 3. Resource partitioning enables similar species to coexist in a community. 4. Secondary metabolites can become essential feeding stimulants for some herbivores.
In the accompanying figure, the part of the embryo that contains most of the food used by the embryonic plant during germination is labeled with the number:
a. 2
b. 3
c. 4
d. 5
e. 6
Which of the following features enable organisms like planarian to respire and exchange nutrients?
A. a trilobed gastrovascular cavity B. coelomic fluid C. an open circulatory system D. closed circulatory system