Which subphylum includes members that have a three-part body plan that comprises a head, a thorax, and an abdomen?
a. Hexapoda
b. Myriapoda
c. Crustacea
d. Trilobita
Answer: a. Hexapoda
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Members of the genus Rhizobium
A. infect broad-leaved plants and cause crown gall disease. B. are important nitrifying bacteria that convert nitrite to nitrate. C. are free living soil bacteria that fix nitrogen. D. grow symbiotically in root nodules of legumes where they fix nitrogen.
Which feature is unique to echinoderms?
a. Water-vascular system b. Radial symmetry c. Cephalothorax d. Ability to regenerate body parts e. Bilateral symmetry
Karyotypes are a method for displaying chromosomes by grouping them into homologous pairs based on what two distinguishing factors?
What will be an ideal response?
You discover two species of sponge, one red and one blue, near a deep sea vent. You genetically engineer the red sponge to produce the same CAMs as the blue sponge. You then take each sponge-the blue sponge and the engineered sponge-dissociate their cells, and mix the red and blue cells together. Which of the following will you most likely observe?
A. a bunch of red and blue cells that stay dissociated B. one sponge with alternating red and blue layers of cells C. one blue sponge and one red sponge D. one sponge with blue cells and red cells randomly distributed E. one sponge with a red side and a blue side