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Question 23What is NOT true about virulence?virulence depends on the development of biofilms or notit is a measurc of the pathogenicityit contributes to the sevcrit...

Question

Question 23What is NOT true about virulence?virulence depends on the development of biofilms or notit is a measurc of the pathogenicityit contributes to the sevcrity of a diseaseit can be caused by some physical structures such as capsule, flagellum; or exotoxinQuestion 24What is NOT true of siderophores?they compete with the host's antibodiesthey are proteins produced by bacteriathey bind t0 the iron-transport proleins ol the host they cause darnage to Ihe host by using Lhe hosts' nut

Question 23 What is NOT true about virulence? virulence depends on the development of biofilms or not it is a measurc of the pathogenicity it contributes to the sevcrity of a disease it can be caused by some physical structures such as capsule, flagellum; or exotoxin Question 24 What is NOT true of siderophores? they compete with the host's antibodies they are proteins produced by bacteria they bind t0 the iron-transport proleins ol the host they cause darnage to Ihe host by using Lhe hosts' nutrients



Answers

Which of the following contributes to the virulence of Streptococcus pyogenes? a) Protease b) Hyaluronidase c) DNase d) All of the above e) None of the above

In this problem. They want us to evaluate the limit as he approaches infinity and then interpret our result. Now, if we were to evaluate the limit here, um, applying it directly, we get infinity over affinity, which I don't know that means, but we call it a little trick that they tell us to do is to find the largest power in our denominator and then divide the number and denominator by that. So in the dominated, the large power is B squared. So we'd multiply the top and bottom by b squared. And doing that, we would end up with the limit as he approaches infinity of eight over B all over one, over B squared plus two overby plus one. And now, if we were to go ahead and apply this limit, we know that all of these approach zero and one just a purchase want. So we'd have zero over zero plus zero plus one, which is just 0/1 or zero. So this here would be our limit now to interpret this well, V is our mortality look great? So because the saying is, as the mortality rate increases, then well, this function here was supposed to tell us number of infected. So then the number of infected approaches or gets very close to zero, so number of affected approaches zero, so this year would be our interpretation of the limit.

Which of these statements about streptococcus progeny is false. A It is a grand positive Caucus in chains be some strange infect wounds and cause toxic shock. Some strains in fact communes and cause necrotizing fasciitis. D. It can cause pereira pro fever. What a a vaccine is available? So streptococcus priorities. There are multiple strains. A lot of these strains produce potent extra toxins. These extra toxins can cause toxic shock if they enter the bloodstream, they can cause massive immune response. They intentionally have super antigenics and the strains that causes they also cause necrotizing fasciitis. So that's also a true statement cannot cause poor apparel fever. That is again a potential complication caused by these extra toxins caused by invasive strep parties. Okay, is it a grand positive Caucus in occurring in chains? Yes, it is something to look forward into the microscope which leaves the answer is being e unfortunately there is no vaccine against it. There are some in testing but currently nothing available.

That this problem now the preparation and very review that view and virus. All right, so we have time. Plus, we heard one of the one place you Ah, it zone between zero and nine. All right. You want to find the maximums and minimums values for this? The equation. So the way we're going to do that was we're gonna take the derivative of P. Um Oops. There you go. All right. So, um, remember that the question Roy's you Ukraine. I'm sorry I said that wrong. You can be minus new prime divided by, um, b squared. All right, then we did team. This is you, Mrs B. Then we get to be plus one times B, which is one year past one plans B squared, plus fee first hand and keep in, which is just one. If I did by the spread. So you plus one squared. Let's simplify that just a little bit or make our lives a little easier. So we're gonna, um his foil method here, Right? That's to these word was to be possibly plus one minus three squared 23 minus 10 all over b squared, Plus to the Actually, we're gonna hold off on that just for let's see if something nice kids was. I'm not sure it will, but that doesn't stop me from hoping it will. Um all right, that's gonna can swell with that a little bit. So we're gonna be squared. Ah, plus me. Oh, plus to be sorry. And then it looks like that's gonna coordinative negative nine. That right? Yeah, that's right. Okay. Already. Then what can we do from here? Well, now that we have that we can, um million zero for, uh, p prime zero is equal to the square. It's to be last night we squared, plus duty plus one we get started solving for you can start something, Praveen During one by both sides by denominator here. I kind of trans lot of stuff into zero. Actually, these were prostitute e last name, right? And I I can't think of a nice, easy way to, um, back to that. So looks like we're going to have to use the quadratic formula is negative. B. So that's native to plus or minus the square root of he squared minus four times eight times. See all over to me. Jesus. It's just one so that makes her life a little easier there. All right, that's gonna spit out to values at us. First one is 2.16 and the second one, it's gonna be somebody outside of our main. You know what? Let's just check up. It's like native 4.16 So that's outside of the main. The answer doesn't really answer because we're only concerned about the answers. Can be somewhere between zero and nine. All right, Um and that is actually uh huh. What year is the smallest population size we want to actually find what the population sizes. We just take this equation here, Been cooking, um, 2.16 into it was to the right here. So pf 2.16 is equal to 10 plus 2.16 plus, uh, 2.16 squared, guided by one plus 2.16 Right. And if you throw that into your calculator, you'll find that that is equal to help by plane, to me to. All right. So since that is the minimum value right there, um means a gruff kind of looks like looking vaguely like that, which means that the maximum values are actually just when basically zero or nine, right? Oh, the zero is equal to F nine, which then is able to attend, plus, uh, zero plus zero squared all over one plus zero. Yeah, that's just a bunch of zeros. So this is all equal to And what is the population? Maximum population size?

Things, question asked. Which of the following would be a virulent factor of a pathogen. We have a surface protein allowing the pathogen to bind to host cells. A secondary host. The pathogen can in fact a surface protein the host immune system recognises, or the ability to form a pro virus. So the answer here will be choice. Okay, And that makes sense because if you look at the choice, it writes that a surface protein allowing the pathogen to bind to host cells and that would be the definition of a virulent factor. So our virulent factor is going to be this protein on the surface of the host cell that will allow the pathogen to bind. So it is a surface protein that allows for pathogen binding, so Choice A is the correct answer.


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