Once commercial whaling stopped, whale populations quickly returned to their pre-whaling sizes
Indicate whether the statement is true or false
FALSE
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Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication that humans do not normally have
For example, humans normally do not have the ability to convert RNA into DNA. How can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? A) The virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles. B) The viral genome codes for specialized enzymes not in the host. C) The virus infects only those cells and species that can perform all the replication roles necessary. D) Viruses can stay in a quiescent state until the host cell evolves this ability.
Complete a sentence starting with the following pairs. For example, "Cell membranes and cell walls are both found in bacteria." Aquaporins and contractile vacuoles. Cell membranes and cell walls. Electrochemical gradient and osmosis
What will be an ideal response?
Which of the following characteristics of membranes does the term "selective permeability" refer to?
a. permits some molecules to cross the membrane while preventing others from crossing b. restricts the passage of polar molecules c. provides an anchor between adjacent cells d. allows membrane proteins to float freely within the membrane
Activation of which of the following is associated with the formation of focal adhesions and stress fibers?
A) Cdc42 B) plectin C) Rho D) Rac E) ?-tubulin