Toads of the genus Bufo can secrete enough poison to kill a 100 pound dog. What is the source of this
poison?
a. epithelial cells
b. goblet cells
c. endothelial cells
d. sweat glands
e. oil glands
A
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Cephalization is:
A. embryonic development of the head in advance of the rest of the body B. concentration of the sensory organs on the posterior end of the body C. concentration of the sensory organs on the anterior end of the body D. an evolutionary degeneration of the head as seen in some parasites E. a malformation of the head
Explain how sex-limited genes are inherited and give an example of this type of inheritance. What will be an ideal response?
In a human cell at prophase I, there are ____ tetrads
a. 92 b. 46 c. 23 d. 2 e. 4
A culture medium on which only gram-positive organisms grow, and in which a yellow halo surrounds Staphylococcus aureus colonies, distinguishing S. aureus from other growing species, is best described as
a. a selective, but not differential medium. b. a differential, but not selective medium. c. an enrichment culture d. both a selective and differential medium. e. both a differential and enrichment culture.