Which organism exhibits meroblastic cleavage?
a. echinoderms
b. amphibians
c. mollusks
d. annelids
e. birds
e
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Virulent bacteria are always damaging to plants and thus have no beneficial uses
A. true B. false
Animals establish and defend territories only when ____
a. the effort does not endanger the life of the individual b. males compete for females by fighting c. some critical resource is in short supply d. females choose among displaying males e. territorial defense is not energetically costly
How does diffusion limit size in cells?
a. Once a cell attains a particular size, the transport proteins in the cell membrane stop functioning and diffusion fails. b. The size of the cell dictates the size of lipids in the membrane. If the lipids become too large, diffusion becomes slower and the cells can starve. c. As cells increase in size, the surface-to-volume ratio decreases and diffusion becomes too inefficient to provide nutrients and waste disposal from the cell. d. Cells that are of a particular size, or greater, enter a state of torpor and growth slows until the cell shrinks again.
Hershey and Chase performed an experiment in which they used radioactive isotopes of phosphorus and sulfur to label different components of bacterial viruses. Their results clearly showed that
a. DNA was entering into the infected bacteria. b. the viruses did not contain protein. c. the viruses did not contain DNA. d. protein was entering into the infected bacteria. e. genetic material normally contains radioactive isotopes.