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TNCC FULL SOLUTION PACK(ALL TNCC EXAMS ANDSTUDY QUESTIONS ARE HERE -ALL ANSWERED
CORRECTLY) ( BUNDLE )
Which of these is the best description of a virus?
A. a noncellular living organism
B. on of the smallest bacteria known
C. a member of the kingdom Virusae
D. a cell at the boundary between living and nonliving things
E. chemical complexes of RNA or DNA protected by protein shell - ANSWER: E
Pasteur chose the Latin root word for "virus" meaning - ANSWER: poison
Which of the following could be used to grow lysogenic viruses in the laboratory?
A. chicken eggs
B. cell culture
C. bacteria
D. all of the choices could be used - ANSWER: D
Ivanowsky first recognized that something smaller than a bacterium, called a
filterable virus, was able to cause disease in the year - ANSWER: 1892
The innermost portion of a virus' structure is made up of - ANSWER: either DNA or
RNA
Influenza strains that sweep around the world often carry names such as Shanghai
H1N1 or Mexico City H2N2.The viruses vary in H and N surface proteins because
A. the viruses reproduce and attack people in cities more often
B. these viruses emerged as stray DNA from the genomes of people in these cities
C. this is where the antibodies of immune people began to break down and the old
virus was again virulent
D. when infected people develop immunity to the present virus, strains that mutate
sufficiently to be outside the range of immunity are soon spread in highly populated
areas - ANSWER: D
If a virus is latent, it
A. cannot be a retrovirus
B. is not actively replicating
C. has not entered a lysogenic cycle
D. is gaining a new envelope via "budding"
E. is easy to develop immunity against it - ANSWER: B
Some, but not all, virus capsids are surrounded by ______ - ANSWER: a membranous
envelope
,In order to infect a cell, a virus must
A. inject its protein into the cell while the nucleic acid remains attached to the host
cell surface
B. have a special protein on its surface that can interact with a protein on the surface
of the host cell
C. actively burrow through the cell wall membrane of the host cell to reach the cell's
nucleus
D. produce a special extension of its cytoplasm when it comes into contact with the
appropriate host cell - ANSWER: B
The cycle of viral infection of a bacterial cell that will cause its death most rapidly is
called the ______ cycle - ANSWER: lytic
The cycle of viral infection in which the viral DNA is integrated into the host's DNA is
called the _____ cycle. - ANSWER: lysogenic
Which statement is NOT true about a retrovirus?
A. it may cause cancer or AIDS
B. it contains reverse transcriptase
C. It remains in the host cell genome, but is not replicated when host DNA is
replicated
D. It has the capacity to integrate cDNA into the host DNA of the cell it infects -
ANSWER: C
An enveloped virus enters a host cell by
A. injecting its DNA or RNA into the host cell
B. fusion of its envelope with the host cell's plasma envelope
C. endocytosis
D. any of the choices are correct
E. attaching to the host cell's membrane and then injecting its DNA or RNA into the
host cell - ANSWER: B
What is the correct sequence of events in the lytic cycle of a bacteriophage
infection?
A. Attachement, Viral DNA penetration into host cell, Integration of viral DNA into
host cell DNA, Biosynthesis, Maturation, Release
B. Endocytosis of virion, Uncoating, Maturation, and Release
C. Attachment, Fusion of envelope and host cell membrane, Biosynthesis,
Maturation, and Release
D. Attachement, Viral DNA penetration, Biosynthesis, Maturation and Release -
ANSWER: D
Which of the following is not part of the reproduction cycle of HIV?
A. reverse transcription of the viral RNA
B. reverse transcription of the viral DNA
C. maturation of the viruses
D. Biosynthesis of the viral mRNA - ANSWER: B
, Viruses are categorized according to all of the following EXCEPT
A. size and shape
B. their type of nucleic acid
C. the presence of absence of an envelope
D. their method of reproduction, whether asexual or sexual - ANSWER: D
What are the two domains that the prokaryotes are classified under? - ANSWER:
archaea and bacteria
Which description best describes the cell wall of a Gram-positive bacteria?
A. it is composed of a single plasma membrane and a thin outer layer of
peptidoglycan
B. it is composed of a double layer in the plasma membrane and a thin outer layer of
peptidoglycan
C. it is composed of a double layer in the plasma membrane and a thick outer layer
of peptidoglycan
D. it is composed of a single plasma membrane and a thick outer layer of
peptidoglycan
E. it is composed of single plasma membrane and a thin outer layer of cellulose -
ANSWER: D
All of the following are menas of genetic recombinations in prokaryotes EXCEPT
A. conjugation
B. transformation
C. transduction
D. crossing over - ANSWER: D
Bacterial cells pick up free pieces of DNA that were secreted by live bacteria or
released form dead bacteria in their environment. This process is called - ANSWER:
transformation
Bacteriophages carry portions of bacterial DNA from one cell to another in a process
called - ANSWER: transduction
Which statement is true about prokaryotes?
A. they contain a nucelus
B. they lack ribosomes
C. they usually lack a cell wall
D. they do not divide by mitosis
E. they contain a long linear strand of DNA as the genetic material - ANSWER: E
Prokaryotes generally range in size from
A. 10-400 nm
B. 20-300 mn
C. 10-100 um
D. 1-10 um
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