Which phylum includes organisms that have bilateral symmetry and protostome development?
a. Porifera
b. Echinodermata
c. Cnidaria
d. Platyhelminthes
e. Chordata
d
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Haustorial roots of dodders and other nonphotosynthetic, parasitic plants rob the host plant of
a. sugars. b. minerals. c. water. d. sugars and mineral e. sugars, minerals and water
Which of the following can serve as antigens?
a. proteins b. carbohydrates c. nucleic acids d. proteins and carbohydrates e. proteins, carbohydrates and nucleic acids
Biodiversity encompasses various levels of organization. Select the exception
a. genetic variation b. species richness c. interactions among ecosystems d. diversity of different ecosystems e. interactions between biomes
If flagellar rotation of Escherichia coli cells is ________, then CheA is ________.
A. clockwise; unphosphorylated B. clockwise; autophosphorylated C. counterclockwise; unphosphorylated D. counterclockwise; autophosphorylated