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Viruses
Environmental Biology 324
Question | Answer |
---|---|
Relative size of tiniest viruses | 20 nm |
Protein shell that encloses viral genome is known as... | capsid |
Discovered that infectious sap in the sack could reproduce... | Martinus Beijefinck |
Crystallize infectious particle... | Wendell Sanley |
main shapes of capsids: | rod-shaped, polyhedral, T4 shape |
Most complex capsids found among viruses are: | bactereophages |
Isolated viruses are merely... | packaged sets of genes in transit from one cell to another |
Virus ability a limited range of host is known as... | Host Range |
Viral nucleic acids can be made from: | enzymes, ribosomes, tRNA, amino acids, ATP etc. |
A phage reproductive cycle that culminates in death of the host cell: | Lytic Cycle |
A phage that reproduces only by a lytic cycle is a: | virulent phage |
If phage enters bacterial DNA it is recognized as foreign and cut up.. | Restriction Enzymes or Endonucleases |
If the phage is replicated without killing the host it is known as... | Lysogenic Cycle |
Phages marked as lambda, depicting both modes of reproduction are known as: | Temperate Phages |
Switch over from lysogenic to lytic cycle is triggered by... | environmental signal, radiation, or chemicals |
Viral envelope: | glycoproteins that bind to specific receptor molecules on the surface of a host cell |
RNA viruses with complex reproductive cycles are known as... | retroviruses |