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
Brums [2.3K]
3 years ago
6

In the classic Meselson and Stahl experiment, Coli are first grown in 15N-enriched media (0th generation) and subsequently switc

hed to 14N media. A DNA sample isolated during the first generation of E. Coli grown in 14N media is subjected to a centrifugation step in a dense CsCl gradient. Assuming that replication occurs in a semiconservative fashion, the DNA sample will _______.
Biology
1 answer:
AfilCa [17]3 years ago
8 0

Options are not provided inthe question. Th ecomplete question is as following:

In the classic Meselson and Stahl experiment, Coli are first grown in 15N-enriched media (0th generation) and subsequently switched to 14N media. A DNA sample isolated during the first generation of E. Coli grown in 14N media is subjected to a centrifugation step in a dense CsCl gradient. Assuming that replication occurs in a semiconservative fashion, the DNA sample will _______.

1) run as two bands (of equal intensity), one at the same position as a uniformly 15N-labeled DNA, and one at the same position as a uniformly 14N-labeled DNA.

2) run as one band, at the same position as a uniformly 15N-labeled DNA.

3) run as one band, at the same position as a uniformly 14N-labeled DNA. run as one band, at a position expected for a DNA containing a 14N:15N ratio equal to 7.

4) run as one band, at a position expected for a DNA containing a 14N:15N ratio equal to 1.

Answer:

1)

Explanation:

In 1957, Meselson and Stahl gave an experimental evidence for semi-conservative replication  of DNA, means that each DNA strand act as template for synthesis of new DNA.

For the experiment, they use  E. coli grown in heavy isotope of 15N nitrogen and switch to 14N nitrogen undergoing one, two, or three generations and the DNA samples are collected. The DNA samples are then mix with cesium chloride and separated as light and heavy DNA.

As the replication occurs in a semiconservative fashion, the double DNA sample will run as two bands with intermediate density, having mixtures of 15N and 14N DNA, either of which would have appeared as DNA.

Hence, the correct option is (1).

You might be interested in
In an ecosystem with similar species, we typically find
pishuonlain [190]
A bunch of the same critters. Nah I am just kidding, you will find a lack of resources because if they are all the same animals they will all eat the same thing. I hope this helps you.
8 0
3 years ago
_______________________________ are the smallest, thinnest vessels in a closed circulatory system and are the site of the exchan
Greeley [361]
Capillaries: <span>any of the fine branching blood vessels that form a network between the arterioles and venules.</span>
5 0
3 years ago
The____is used to study the similarities in different species from long ago and to reveal links between the species .
Darya [45]
It’s Molecular Homology
5 0
3 years ago
Read 2 more answers
Explain the relationship between cellular respiration and muscle contractions.
Natalija [7]
Cellular respiration provides the ATP necessary for muscle contractions 
8 0
3 years ago
What 3 green house gases are in our atmosphere
Andreyy89

Answer:

Carbon dioxide, nitrous oxide, and methane

Explanation:

4 0
2 years ago
Other questions:
  • What molecular conformation (structure) of homologous chromosomes facilitates crossing over
    6·1 answer
  • I NEED HELP!!!<br><br> Explain what is meant by a polar molecule.
    5·2 answers
  • What are some examples of changes in traits that humans have influenced?
    9·1 answer
  • What was an unexpected consequence of the green revolution?
    7·2 answers
  • In what biome is Texas?
    8·2 answers
  • What is true of sand dunes? A) they are built by waves B) they are made by rivers cutting through land C) they are built by wate
    12·1 answer
  • What does the term "complementary" mean in base-pairing?
    13·2 answers
  • Why do your fingers look like prunes after swimming for a long time?
    5·2 answers
  • How does farming creates job for people?
    10·2 answers
  • Explain why most nerve cells have a myelin sheath (2 marks)​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!