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Likurg_2 [28]
3 years ago
14

E. coli is a species of bacteria that causes many different infections in humans. Certain E. coli strains have developed resista

nce to antibiotics, making infections with these strains difficult to treat. How do bacteria such as E. coli, which reproduce asexually, gain new traits such as antibiotic resistance?
A. by adapting to changes in environmental conditions without undergoing changes in their DNA
B. by mutating their DNA in response to environmental conditions to gain beneficial traits
C. by producing offspring with new gene assortments from genetic recombination, which increases diversity in a population
D. by undergoing spontaneous mutations when they replicate, which increases genetic variation in a population
Biology
2 answers:
Nastasia [14]3 years ago
8 0

Answer:

The correct answer will be option-B

Explanation:

Antibiotic resistance in bacteria develops in response to the environment in which the bacteria survives.  

The antimicrobial resistance trait is acquired by any species of bacteria through one of the two ways that are either by making changes in their DNA sequences or through horizontal gene transfer mechanisms.

In the given E. coli gained the trait to develop resistance against antibiotic by making changes in their DNA as once the gene is altered or mutated, the trait can be passed on to the offsprings.

Thus, Option-B is the correct answer.

mixer [17]3 years ago
3 0

B. By mutating their DNA in response to environmental conditions to gain beneficial traits.

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kati45 [8]

Answer:

Because the ping pong ball has a lesser mass than a baseball; hence the ping pong ball will accelerate faster than the baseball when a constant force is applied to both

Explanation:

The force applied to an object is a product of its mass and acceleration i.e. F=ma. According to Newton's second law of motion, the relationship between the mass of an object and its acceleration when force is applied to it was described.

In a summary, the second law states that that the acceleration of an object increases with increased force and decreases with increased mass. This means that the more the mass of an object, the greater the force needed to make it accelerate and also the more the mass, the lesser it accelerates.

In this case, a ping pong ball has a lesser mass compared to a baseball, hence, it will accelerate faster than the baseball assuming an equal force was applied. Since the ping pong ball will accelerate faster, it will hit a person faster than the baseball.

4 0
3 years ago
Organic compounds ALL contain the element carbon. Which organic compound, used for stored chemical energy, contains
skad [1K]

Answer:

The correct option is <u>B. Lipids</u>

Explanation:

Lipids can be described as molecules which dissolve in non-polar solvents and cannot dissolve in water. The biological function of a lipid molecule is to store energy as well as to structure the shape of cell membranes. Lipids are also used in a cell for signalling.

Lipids are made up of carbon, hydrogen and oxygen. Some lipids might have phosphorus in them like the phospholipids which make up the cell membrane.

6 0
3 years ago
The steps or parts of a pattern of propaganda include organization, argument, publicity and ______ .
ioda

Answer:

Persuasion

Explanation:

Propaganda is manipulation with public opinion, it is a technique of influencing people’s actions through arguments and persuasion. Propaganda can be done in various ways and some of them are oral, written and visual ways.

As propaganda’s purpose is to convince people in something, techniques used for propaganda are founded on psychological research. People who use propaganda use arguments that don’t have to be valid but have to be convincing.

7 0
3 years ago
1. Describe the possible mechanisms whereby exercise may enhance health status and list at least eight of the potential health b
Gala2k [10]

Answe

Explanation:

Excersice increases the cardiac and skeletal muscels strenght for maximum oxygen consumption for energy output.

It lowers the blood pressure and in prove RBC count for oxygen transportation and distribution.

It cut down risk of osteoporosis, by stimulating bone growth.

5 0
3 years ago
1. results in no motion of the object because forces are equal and in opposite directions
sammy [17]

Answer:

Balanced Forces

Explanation:

When the forces acting on an object have equal strength and act in opposite directions, they are balanced.When the forces acting on an object are unbalanced, they do not cancel out one another.

8 0
3 years ago
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