Which of the following cells has the greatest number of different cellular organelles made of membranes?
A. bacteria
B. animals
C. plants
D. viruses
C. plants
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If you break your leg, the bone heals by forming a thickened area around the outside of the bone. Over a period of time, this thickened area:
B) is eaten away by osteoclasts. C) is digested by enzymes secreted by the muscles. D) forms new tendons, ligaments, and/or muscles. E) moves to the skin surface and is shed as dead skin.
All of the following statements about ferns are correct except
A. ferns flourish in many habitats, but the majority are located in the tropics. B. the sporophyte is a conspicuous generation. C. the gametophyte is a conspicuous generation. D. ferns have underground stems called rhizomes. E. sori are located on the back or ventral surface of fronds.
Permafrost underlies _____
a. arctic tundra c. boreal forest b. alpine tundra d. all of these
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.