For most metazoans, what is the name of the outermost tissue layer during development?
a. epiderm
b. ectoderm
c. endoderm
d. mesoderm
Ans: b. ectoderm
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The niche of the species is best described as:
a. the biological relationships of the species in the ecosystem. b. the behavior of a species in the ecosystem. c. the sum of the abiotic factors required or tolerated by the species. d. the occupation (needs and role) of the species in the ecosystem. e. the location where the species resides.
Males with low fertility, abnormally small testes, sparse body hair, and enlarged breasts probably have
a genotype of a. XO. b. XX. c. XXX. d. XXY. e. XYY.
Mendel continued some of his experiments into the F2 or F3 generation to _____
A) obtain a larger number of offspring on which to base statistics B) observe whether or not a recessive trait would reappear C) observe whether or not the dominant trait would reappear D) distinguish which alleles were segregating
In the Gram-staining procedure, the counterstain is ________.
A. iodine B. safranin C. alcohol D. crystal violet