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NCERT Exemplar Solutions Class 9 Science Solutions for Why Do We Fall ill ? - Exercise in Chapter 13 - Why Do We Fall ill ?
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Making anti-viral drugs is more difficult than making anti-bacterial medicines because
(a) viruses make use of host machinery
(b) viruses are on the borderline of living and non-living
(c) viruses have very few biochemical mechanisms of their own
(d) viruses have a protein coat
Answer:
The answer is (c) viruses have very few biochemical mechanisms of their own
Explanation:
Antibacterial drugs stop certain biochemical reaction in the bacteria that kills the bacteria. But in the virus there are few biochemical processes that are difficult to target hence making anti-viral drugs is difficult.
Video transcript
"hello students welcome to leader
learning this is ashwini i teach science
at leader
so here we have a very interesting
question that making antiviral drugs is
more difficult than
making antibacterial medicines because
a viruses make use of host machinery
b viruses are on the borderline of
living and non-living
option c viruses have very few
biochemical mechanisms of their own
and option b is virus have a protein
code
so the correct option is option c
that viruses have very few biochemical
mechanisms of
their own this means that as you see the
second diagram is a
virus here okay this second diagram
shows that
the virus is having a protein code rna
and dna material in the center
okay rna and genetic material in the
center dna is not
present in virus now here if i'm talking
about
the outer strings these yellow parts are
these spikes
which can cause the infection now here
if i'm talking about the viruses
then they do not have their own
biochemical mechanism they will
infect a person okay human or
any other organisms like animals plants
this will be their host and they will
survive on this
host machinery they do not have their
own mechanical or biochemical processes
to survive they will depend on this post
okay
they have only few biochemical mechanism
but
bacterias if i'm talking about the
bacteria structure then
it contains a cell wall cytoplasm cell
membrane
cell capsule nucleoid plasmid
and flagellum so bacterias have their
own
biochemical processes which can be
killed by the antibacterial medicines
but
antiviral drugs are made like the making
of antiviral drugs are difficult
because if virus do not have their own
biochemical mechanism then
how could we know that at what
biochemical mechanism we have to make
the drugs
right for bacteria as we know that there
they have certain biochemical mechanism
for their
machinery so we can make the disease we
can make the medicines or the drugs
according to that
okay but for viruses there will not be a
fixed
biochemical mechanism so that is the
reason that antiviral drugs is more
difficult than
making antibacterial medicines for
viruses
i hope everything is clear to you if you
have any doubts then please put it down
in the comment section for more such
video solutions please subscribe leave a
learning thank you"
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