A homozygous red-eyed female Drosophila mates with a red-eyed male Drosophila. What proportion of the female offspring will have white eyes?
A. 75%
B. 0%
C. 100%
D. 50%
E. 25%
Answer: B. 0%
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As a transitional form, Archaeopteryx is important because it provides insight into
a. the evolution of birds into reptiles. b. the relationship between dinosaurs and birds. c. adaptations for animals moving from an aquatic to a land environment. d. all of these
Parazoa
A. exhibit bilateral symmetry. B. are pseudocoelomates. C. exhibit primitive segmentation. D. include Cnidaria and Ctenophora. E. have no true tissues.
Cells that release chemical mediators in both inflammation and allergy are the ____ cells
a. mast b. neutrophils c. eosinophils d. dendritic e. lymphocytes
Which of the following is a nitrogen-fixing bacterium that forms associations with the roots of plants?
A. anaerobic Bacillus species B. Clostridium species C. Rhizobium species D. Azotobacter species E. cyanobacteria