1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Vika [28.1K]
2 years ago
14

Phosphorus is required to synthesize the deoxyribonucleoside triphosphates used in DNA replication. A geneticist grows some E. c

oli in a medium containing nonradioactive phosphorus for many generations. A sample of the bacteria is then transferred to a medium that contains a radioactive isotope of phosphorus ( 3232P). Samples of the bacteria are removed immediately after the transfer and after one and two rounds of replication. Assume that newly synthesized DNA contains 3232P and the original DNA contains nonradioactive phosphorus. What will be the distribution of radioactivity in the DNA of the bacteria in each sample? Will radioactivity be detected in neither, one, or both strands of the DNA?Think about what this looks like after 1 round of replication. Two rounds? Also, what would this look like if the conserved model or dispersive model of replication were correct instead?
Biology
1 answer:
Harlamova29_29 [7]2 years ago
4 0

Answer:

<h2> After one round: one strand of DNA  will contain radioactive 3232P, while the other strand  will not contain any radioactive phosphate. </h2><h2> After two rounds:  here 50%  of DNA will have 3232P in both strands, while 50% will contain 3232P in one strand and nonradioactive in the other strand. </h2>

 

Explanation:

1. In the initial sample which is immediately removed after addition of radioactive isotope of phosphorus ( 3232P), hence there is  no incorporation of 3232P into the DNA because replication in the medium containing 3232P has not yet occurred.  

2. After one round of replication in  radioactive isotope of phosphorus ( 3232P) containing  medium, here  only one newly synthesized strand of DNA molecule will contain 3232P, while the other strand  will not contain any  radioactive isotope of phosphorus ( 3232P),  because DNA replication occurs in semi-conservative way.

3. After two rounds of replication in medium which contains radioactive isotope of phosphorus ( 3232P), here 50% of the DNA molecules will have  radioactive isotope 3232P in both strands, while the rest 50% will contain 3232P in only one strand and nonradioactive phosphorous in the other strand.

You might be interested in
How were Lamarck’s and Darwin’s ideas most similar?
irinina [24]

Answer:

Darwin and Lamarck's theory is different but they were also very similar. Both of them thought that the organism changed, and they are very helpful for the organism to survive. These characteristics are also passed to their young generation.

Darwin theory state that an organism gets the helpful variation before the changes in the environment, Lamarck's theory said that organism gets variation after the change in the environment.

Lamarck's stated that giraffe got long neck when the food on the ground ran out. In order to get the food they stretch out their neck to get food. Darwin thought organism changed by chance, at the time when they are born and before the change in the environment.


6 0
3 years ago
Read 2 more answers
Leaves attach to stems at nodes; the spaces between the nodes are internodes<br> true or false
dalvyx [7]
I believe it's is true
6 0
3 years ago
Read 2 more answers
Which of the following processes removes carbon dioxide from ocean waters?
kvasek [131]

Answer: i would say the answer is d

8 0
3 years ago
Why would a civilization choose to live next to a river that regularly floods
Galina-37 [17]

They would because they need that water for growing plants and some crops grow on water.

https://nerdfighteria.info/v/n7ndRwqJYDM/

There is a link that can answer your question better.

Hope that helps and feel free to ask me more questions :)Brainliest??

6 0
3 years ago
Read 2 more answers
How are land, air, water and living things impacted by too much carbon dioxide?
choli [55]

Answer:

- In terrestrial environments: increasing CO2 levels cause an increased photosynthetic rate

- In aquatic environments: increasing CO2 levels cause an increase in water acidity  

- In both terrestrial and aquatic environments: increasing CO2 levels lead to an overall increase in the average temperature (global warming)

Explanation:

In terrestrial ecosystems, rising carbon dioxide (CO2) levels increase the rate of photosynthesis (since CO2 is one of the reactants in photosynthesis), thereby also increasing plant growth. Moreover, in aquatic ecosystems, rising CO2 concentrations increase the levels of this gas dissolved on the surface of the oceans. This increases the acidity of the oceans, thereby modifying habitats and food web structures. The increasing acidity of the oceans also reduces the amounts of carbonate, which difficult for aquatic species (e.g., corals) to form their shells/skeletons. Finally, CO2 is a greenhouse gas that contributes to the increase in the average temperature by absorbing solar radiation that would otherwise have been reflected by the Earth's surface, and this increase in the temperature negatively affects life in both terrestrial and aquatic environments.

5 0
2 years ago
Other questions:
  • If W stands for long wings, write the symbols for the alleles of each parent fly
    11·2 answers
  • The nurse in a burn intensive care unit (bicu) is caring for a 3-year-old boy who was burned with scalding hot water. he has bur
    6·1 answer
  • What safeguards must society adopt to handle the rapid advances in biotechnology?
    8·1 answer
  • Which is not true about the discovery of new scientific evidence and theories?
    7·1 answer
  • ITS REALLY IMPORTANT, PLZZ BE CORRECT. THANKS!
    9·1 answer
  • Describe the structure and composition of the skin.
    12·1 answer
  • Given that the tundra is very dry most of the year, why don't plants that live on the tundra have deep roots to search for water
    11·1 answer
  • Causes and Solutions for Water pollution(Grade-7) ​
    9·1 answer
  • (GIVING BRAINLIEST AND EXTRA POINTSS!!!!)
    15·1 answer
  • How does pressure affect osmosis
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!