Viruses, although not considered to be alive, attack host cells and cause disease. The attack of a host cell is necessary for th
e virus to survive for all of the reasons listed EXCEPT one. That is A) they cannot synthesize proteins because they lack ribosomes and must use the ribosomes of their host cells to translate viral messenger RNA into new proteins. B) they cannot produce or store energy in the form of ATP and have to get their energy from the host cell. C) they parasitize the host cell for basic molecules like amino acids, nucleotides, and lipids. D) they lack DNA so they must use the DNA of the host cell. Elimin
The correct answer is (D) They lack DNA so they must use the DNA of the host cell.
Viruses have their own genetic material to replicate and they need not to use the genetic material for the their survival in host body. Growth and division is one of the important factors for the survival of the organism. The virus themselves have their genetic material RNA or DNA for replication. They just need a host body because they cannot synthesize protein. They cannot produce or store energy. They lack molecules like nucleotide and lipid.
I think the correct answer from the choices listed above is option A. It is the alveoli that is composed of single layer <span>surrounded by a network of capillaries. These are used to allow oxygen and carbon dioxide to move from the lungs to the bloodstream.</span>
The importance of ecosystem stability is that if the ecosystem is not stable then it cannot survive. A current example of an unstable ecosystem in the Amazon Rain forest. It has been delt so much damage that it is begining to self destruct and kill itself as well as emit greenhouse gases instead of slowing them.
