Bacteriophage viruses were added to a petri dish containing sterile agar growth medium. After a week, the dish was sampled and a number of viruses present was compared. What results would be expected?

The virus populations should be in exponential growth since there are ample food and no competition.

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After a week, the viruses should be reaching carrying capacity and the population will be stabilizing.

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After a week, the viruses should have already exhausted most of the resources in the closed petri dish and the population will be on the decline.

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No new viruses will be present without the presence of host bacteria.

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Solution

The correct option is C No new viruses will be present without the presence of host bacteria.
Virus require host cells to replicate. It cannot grow in a nutrient medium where host cells are absent, here, the bacteria, that are host to bacteriophages.
So, the correct answer is 'No new viruses will be present without the presence of host bacteria'

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Q. Bacteriophage viruses were produced in the presence of radioactively tagged materials, resulting in the presence of both radioactive proteins and radioactive nucleic acids in the viruses.
These viruses were then allowed to infect bacteria in normal growth medium. Viruses produced during the lytic cycle were sampled for radioactivity.
What parts of the virus should show radioactivity?

The growth of ampicillin resistant bacterial population (strain 1) infected by a virus declines as the virus enters lytic cycle. Then the virus undergoes lysogenic cycle and further remove themselves from bacterial genome during heat shock treatment to proteins. All the bacteria die after some time and only free virus now grow. A second bacterial ampicillin sensitive population (strain 2) is infected by this virus. Similarly, the bacterial population decreases and ampicillin population rebounds.

Which of the following explains the rapid growth of bacterial population as compared to human population?

Ampicillin-resistant bacterial population (Strain 1) is grown in a laboratory is infected with a virus. The virus initially goes through the lytic cycle and thus bacterial population begins to decline, then rebounds as the virus integrates
into the bacterial chromosome to begin the lysogenic cycle. The bacteria reproduce normally until they are heat-shocked. The virus removes itself from the bacterial genome and enter the lytic cycle because of the temperature is increasing rapidly. Within several hours all bacteria are dead and a free virus is found in high concentration in the bacterial growth medium. This free virus infects bacterial population that is sensitive to ampicillin (Strain 2). After the expected decrease and rebound of this bacterial population (as above), the rebounded population was found to be ampicillin-resistant. Oxygen is constantly infusing in bacterial culture to ensure a high rate of reproduction among the bacteria and a health.

The growth of ampicillin resistant bacterial population (strain 1) infected by a virus declines as the virus enters lytic cycle. Then the virus undergoes lysogenic cycle and further remove themselves from bacterial genome during heat shock treatment to proteins. All the bacteria die after some time and only free virus now grow. A second bacterial ampicillin sensitive population (strain 2) is the one infected by this virus. Similarly the bacterial population decreases and ampicillin population rebounds.

Which of the following increases genetic diversity in bacteria?

I. Conjugation

II. Transformation

III. Crossing over

Q. The growth of ampicillin resistant bacterial population (strain 1) infected by a virus declines as the virus enters lytic cycle. Then the virus undergoes lysogenic cycle and further remove themselves from bacterial genome during heat shock treatment to proteins. All the bacteria die after some time and only free virus now can grow. A second bacterial ampicillin sensitive population (strain 2) is the infected by this virus. Similarly the bacterial population decreases and ampicillin population rebounds.

Which of the following phenomenon is responsible for the development of ampicillin resistance by bacterial strain 2?

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