Amphibians evolved directly from what ancestral organisms?
a. reptiles
b. shelled invertebrates
c. fishes
d. soft-bodied animals
e. marine invertebrates
C
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Although Deinococcus-Thermus phyla stain Gram-positive, which reason(s) exclude them from this Gram type?
A. They lack teichoic acids. B. Their cell envelope includes an S-layer. C. They have L-ornithine in their peptidoglycan. D. Their plasma membrane has phosphatidylglycerol phospholipids instead of palmitoleic acids.
What would you assume if you found RNA transcripts of lactose-utilizing genes within E. coli?
A) Lactose has bound to the lac operon activator. B) Lactose is present in the cell. C) The lac operon activator protein is present in the cell. D) The lac operon repressor protein is absent in the cell.
An example of an organism that parasitizes a host plant is
A) a mycorrhizal fungus. B) nitrogen-fixing bacteria in root nodules. C) a Venus flytrap. D) mistletoe.
In which situation can a mixture always be called a solution?
A. when one of its components is a gas B. when there is no solvent in the mixture C. when its components are made up of different types of particles D. when the mixture is homogeneous