Indicate whether the sentence or statement is true or false.
Although viruses do not consist of cells, biologists consider them to be living because they are capable of reproduction.
Some viruses have a membranous envelope surrounding the protein coat that helps them gain entry into host cells.
Viruses consist of RNA or DNA surrounded by a coat of protein.
Prions are the smallest known particles that are able to replicate.
A virus can only reproduce by controlling a cell.
Once a virus enters either a lytic or a lysogenic cycle, it cannot change to the opposite type of cycle.
Prophages and proviruses can both enter lytic cycles and destroy host cells.
People can contract the influenza virus more than once because the virus tends to mutate rapidly, avoiding the actions of the immune system.
Smallpox is caused by bacteria.
Chickenpox and shingles are caused by the same virus.
Identify the letter of the choice that best completes the statement or answers the question.
The study of viruses is a part of biology because
they belong to the kingdom Eubacteria.
they are about to become extinct.
they are living organisms.
they are active inside living cells.
The capsid of a virus is the
protective outer coat.
cell wall and membrane complex.
A membranous envelope surrounding some viruses may be composed of
All of the above
viruses : nucleic acids::
water : ice
simplicity : complexity
brick : wood
a jigsaw puzzle : individual pieces
A typical virus consists of
a protein coat and a cytoplasm core.
a carbohydrate coat and a nucleic acid core.
a protein coat and a nucleic acid core.
a polysaccharide coat and a nucleic acid core.
Refer to the illustration above. Which labeled structure could possibly be made of RNA?
In which type of cell cycle(s) does viral DNA become integrated into the host cell’s DNA?
neither lytic nor lysogenic
lytic and lysogenic
A prophage differs from a provirus in that
a prophage contains DNA, while a provirus contains RNA.
a prophage is formed during a lysogenic cycle, while a provirus is formed during a lytic cycle.
a prophage contains DNA found in the infecting virus particle, while a provirus contains DNA produced from viral RNA.
a prophage becomes integrated into a host cell’s DNA, while a provirus cannot become integrated into a host cell’s DNA.
Which of the following is not a virus linked to cancer?
Which of the following human activities is most closely associated with emerging viruses?
absence of a vaccination program
clearcutting of forests
crowded living conditions
eating uncooked meat