Viruses have typical cellular structure like other living organisms. - ✔️✔️FALSE
Viruses in the extracellular state possess few, if any, active enzymes. - ✔️✔️TRUE
Which is not true of viruses? - ✔️✔️They infect animal and plant cells only.
Which of the following is true of viruses in the extracellular phase? - ✔️✔️They behave as a
macromolecular complex and are no more alive than are ribosomes.
A complete virus particle is called a - ✔️✔️virion
The nucleic acids carried by viruses usually consist of - ✔️✔️either DNA or RNA.
Which of the following is not true of viruses? - ✔️✔️Viruses replicate by binary fission
Viruses infecting protists, including algae, have never been detected. - ✔️✔️FALSE
One way in which small viruses package more information into a very small genome is to use
overlapping genes so that the same base sequence is read in more than one reading frame. - ✔️✔️TRUE
Almost all known plant viruses are RNA viruses. - ✔️✔️TRUE
Virus morphology does not include which of the following characteristics? - ✔️✔️host range
__________ are glycoprotein spikes protruding from the outer surface of the viral envelope. -
✔️✔️peplomers
,Icosahedral viruses are constructed from ring- or knob-shaped units called __________. - ✔️✔️capsomers
Viruses that are polyhedrons with 20 sides are said to have __________ symmetry. - ✔️✔️icosahedral
5. The most common capsid morphologies are icosahedral and helical. - ✔️✔️TRUE
The largest of the viruses are similar in size to some small bacteria and are large enough to be seen with
a light microscope. - ✔️✔️TRUE
The presence or absence of an envelope is not useful in classifying viruses because any given virus may
at one time have an envelope and at another time not have an envelope. - ✔️✔️FALSE
Viruses such as MS2 and Qß pack additional information into their genomes through the use of
overlapping genes. - ✔️✔️TRUE
The simplest viruses consist of - ✔️✔️RNA or DNA and a protein coat
Viral capsid protein subunits are called - ✔️✔️protomers
In an enveloped virus, the part of the virus including the nucleic acid genome and the surrounding
protein coat but not the envelope is called the - ✔️✔️nucleocapsid.
Some complex viruses have icosahedral symmetry in the head region and helical symmetry in the tail.
Overall, these viruses are said to have __________ symmetry. - ✔️✔️binal
Glycoprotein spikes protruding from the outer surface of viral envelopes function as - ✔️✔️factors that
bind to host cells.
, A __________ genome exists as several separate, nonidentical molecules that may be packaged
together or separately. - ✔️✔️segmented
Many of the enzymes found in virus particles are - ✔️✔️involved in the replication of viral nucleic acid.
Which of the following is/are not true about viral envelopes? - ✔️✔️They are typical lipid monolayers with
embedded viral proteins.
Viral envelopes are composed of - ✔️✔️proteins, lipids, carbohydrates
Two major types of symmetry found in viruses include - ✔️✔️icosahedral and helical.
The function of the viral protein coat is to - ✔️✔️protect the viral genetic material and aid in the transfer
of the viral genetic material between host cells.
The protein coat surrounding the viral genome is called the - ✔️✔️capsid
Which of the following is most true of a viral DNA genome? - ✔️✔️It may have the normal bases found in
prokaryotic and eukaryotic DNA, or it may have one or more unusual bases.
Virion size ranges from - ✔️✔️10-400 nm.
Viral capsids are generally constructed without any outside aid once the subunits have been
synthesized. This process is called - ✔️✔️self-assembly.
In which of the following stages of the viral infectious cycle do enveloped viruses usually acquire their
envelopes? - ✔️✔️release
Most enveloped viruses use the host __________ membrane as their envelope source - ✔️✔️plasma
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