What does the term echinoderm mean?
a. Ten footed
b. Smooth skinned
c. Porous skin
d. Spiny skinned
e. Rough skinned
d
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The anti-bacterial peptides secreted by frogs and toads is produced by:
a. epithelial cells. b. goblet cells. c. endothelial cells. d. sweat glands. e. oil glands
Which of the following is true in the course of the evolution of a trait in a species?
A. A population mutated in response to the need for a certain trait. B. An organism mutated during the course of its life to become better able to survive in its environment. C. A mutation benefited an individual and allowed it to pass more genes on to the next generation. D. An individual organism recognized the need for longer legs and evolved them.
Which of the following hormones stimulate osteoblasts to form bone?
A. parathyroid hormone B. growth hormone C. erythropoietin D. sex hormones E. Both growth and sex hormones
A South San Francisco child enjoyed bath time at his home because of the colorful orange and red water
The water did not have this rusty color at its source, and the water department could not culture the Thiobacillus bacteria responsible for the rusty color from the source. How were the bacteria getting into the household water? What bacterial structures make this possible?