BIOLOGY COLLEGE

The antibiotic ciprofloxacin often is prescribed for serious cases of food poisoning caused by the bacterium Campylobacter jejuni, which is common in the intestines of farm animals and is not harmful to them, but may cause acute food poisoning in humans. Which of the following is correct given prolonged use of this antibiotic? (A) Prior to antibiotic treatment, most Campylobacter are ciprofloxacin-resistant.
(B) Ciprofloxacin treatment kills or halts the growth of the sensitive strains, yet the resistant strains survive.
(C) Repeating the treatment of the same patient or a population multiple times results in a strain of Campylobacter that is more susceptible to the antibiotic.
(D) Treatment with ciprofloxacin causes the patient to evolve resistance such that the next time the patient gets an infection, it will no longer be effective.

Answers

Answer 1
Answer:

Answer:

(B) Ciprofloxacin treatment kills or halts the growth of the sensitive strains, yet the resistant strains survive.

Explanation:

Campylobacter jejuni is the causal agent of the food-borne infection with the highest incidence in Europe. Both poultry and wild birds are a major reservoir of the bacteria, the bacteria lives in the intestines of warm blooded animals but is only quite harmful to humans. It has been identified that the diversity fo genes is responsible for its resistance to antibiotics.

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Results from multiple experiments suggest that the ActA protein of Listeria, an integral membrane protein expressed on the cell surface, is the only bacterial protein that is required for the movement of the bacterium within its host cell. Which combination of the following observations shows that ActA is both, necessary and sufficient for bacterial movement?Please note: E. Coli is not an intracellular bacterium - it does not normally move inside the cytosol, and it does not express ActA.

I. ActA binds to the Arp2/3 complex

II. E. Coli in which ActA is expressed moves in host cell cytosol

III. Listeria lacking the ActA gene fail to move inside the host cell cytosol.

IV. ActA has 3 transmembrane domains

V. Arp2/3, when activated, nucleates a branched actin network

A. I and II

B. II and III

C. I and III

D. III and IV

E. I and V

Answers

Answer:

The correct answer is option B. "II and III".

Explanation:

In order to prove that ActA protein of Listeria is necessary and sufficient for bacterial movement within its host cell a series of results in transformed Listeria and transformed E. Coli must be obtained. First, if Listeria lacking the ActA gene fail to move inside the host cell cytosol it will prove that ActA is necessary for bacterial movement. Second, a transformed E. Coli that expresses ActA should be able to move in host cell cytosol. Wild type E. Coli does not expresses ActA, if ActA alone makes E. Coli able to move in host cell cytosol it will prove that ActA is sufficient for bacterial movement.

Need help with this please really would appreciate ❗️❗️❗️❗️❗️❗️❗️❗️

Answers

it’s moral to preserve because you need to take care of there habitats instead of resorting them

Answer:talk about how fascinating Nature is in all of the good qualities it’s good to preserve nature for animals and to make the world last longer with things like pollution and go on from there

Explanation:

Bone does not amplify sound during speaking is _____________________

Answers

Answer:

Bone is a solid tissue, which resists a high impact of forces in its major axis.

The function of this fabric is not to transmit sounds, since it does not provide the elasticity, and the necessary elongation that is needed to generate the rope effect as in the case of muzzle cords.

Explanation:

The more rigid and less elastic the fabric is, the less sound it will transmit.

Sound strings, or mouth strings, are those that tighten, are flexible and resonate with different vibrations, in the case of bone tissue, sound vibrations are not influenced in their conformation because they do not have the ability to transmit them. .

The bone tissue, transmits impact forces or high newton levels, does not fulfill the function of transmitting vibrations and emitting sounds in terms of this type of vibrations and their frequencies.

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Answers

Answer:

If this was edmentum. this was my question and answer

Explanation:

see pic below

Answer:

Ok, no boxes but whatever

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Answers

Answer:

enzyme RuBisCO

(im not sure but i think its this)

Stionsctions: Answer the questions in a complete sentence.
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Answers

Final answer:

Passive transport does not require energy and substances move from an area of high concentration to an area of low concentration. Active transport requires energy and substances move against the concentration gradient.


Explanation:

The major difference between passive and active transport is that passive transport does not require energy, while active transport requires energy. In passive transport, substances move from an area of high concentration to an area of low concentration without the use of energy. Examples of passive transport include diffusion and osmosis. In contrast, active transport involves the movement of substances against the concentration gradient, from an area of low concentration to an area of high concentration, with the use of energy. An example of active transport is the sodium-potassium pump.


Learn more about difference between passive and active transport
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