Kevin is studying predator-prey interactions. One day he notices a spider eating a cricket caught in its web. Later that day, a bird eats the spider. How many producers are there is this scenario?
A) 0
B) 1
C) 2
D) 3
E) 4
Answer: A) 0
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Statements about what a researcher expects to happen to one variable if another variable changes are called ____
a. predictions b. hypotheses c. experimental variables d. theories e. scientific research
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What is the key activity of panel II in the accompanying figure?
A. The enzyme is consumed as the products form. B. The substrate leaves the active site. C. The conversion of substrates to products occurs. D. The product leaves the enzyme. E. The product decomposes to the reactants.
Shin splints occur from stress placed on the lower leg causing bones to split.
a. true b. false
Which type of junction contributes the most to the polarization of epithelial cells?
(a) adherens junctions (b) desmosomes (c) tight junctions (d) gap junctions