MADS-box genes affect:
a. only flowers. c. leaves, roots, and flowers.
b. segmentation in animals. d. early development.
C
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During sperm formation the cell type that divides by mitosis is the ____
a. primary spermatocyte b. secondary spermatocyte c. polar body d. polar body e. spermatids
Compare two environments at 45° N latitude: environment A's altitude is 50 meters and environment B's altitude is 3000 meters. Which environment will support the greater level of species richness for mammals and birds?
A) Environment A will have the greater level of species richness. B) Environment B will have the greater level of species richness. C) Environments A and B will have the same species richness.
The two tissues of the eye with exposed surfaces susceptible to contamination are the ________ and the ________.
A. conjunctiva; lens B. cornea; iris C. conjunctiva; iris D. conjunctiva; cornea E. cornea; lens
The sequence of eras beginning with the earliest era and processing forward to the most recent era in the geologic time scale is
A. Archean - Mesozoic - Cenozoic. B. Cenozoic - Archean - Mesozoic. C. Archean - Paleozoic - Proterozoic. D. Mesozoic - Cenozoic - Paleozoic. E. Paleozoic - Mesozoic - Cenozoic.