The important roles of viruses in ecosystems are a. Limiting host population den
ID: 223209 • Letter: T
Question
The important roles of viruses in ecosystems are a. Limiting host population density without extinction of the host b. Selection for host diversity to prevent dominance of many one species c. Both A and B. d. None of the above al;l (-) stranded RNA viruses must bring their own RNA dependent RNA polymerase protein because: a. They bind to acids. b. They have no proof-reading function. c. Negative strand RNA is an untranslatable RNA that cannot be read by ribosome. d. The host RNA dependent RNA polymerase would destroy the incoming viral RNA. e. None of the above. Supercoiling of the DNA in becteria is typically introduced by an enzyme called a. Gyrase b. Helicase c. Ligase d. Polymerase e. Endonuclease Which of the following is not true of DNA replication in E. coli? a. It is semiconservative and bidirectional b. The DNA pol III protein is the major enzyme in replication and it has a proofreading activity that corrects errors in base-pairing c. The second sExplanation / Answer
1. Hapanoids: In bacteria, different cyclic triterpenes, the hapanoids, are synthesized from squalene by triterpenes cyclases.
2. The process is initiated at particular points in the DNA, known as "origins", which are targeted by initiator proteins. Once the origin has been located, these initiators recruit other proteins and form the pre-replication complex, which unzips the double-stranded DNA. The answer in the blanks are Origin, inititaor proteins and pre-replication complex.
3. Heat shock proteins (HSP) are a family of proteins that are produced by cells in response to exposure to stressful conditions. They were first described in relation to heat shock, but are now known to also be expressed during other stresses including exposure to cold, UV light, and during wound healing or tissue remodelin.
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