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denpristay [2]
3 years ago
12

What is thought to be true about the three domains of living things

Biology
1 answer:
prohojiy [21]3 years ago
7 0
Most likely D, was there a photo that went with this?
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In the classic Meselson and Stahl experiment, Coli are first grown in 15N-enriched media (0th generation) and subsequently switc
AfilCa [17]

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).

8 0
3 years ago
What can a "molecular clock" provide an estimate of?
defon
A It’s very simple I have gone over this
3 0
2 years ago
Read 2 more answers
Help me plzzzzzzzzzzz
matrenka [14]
D. Because an amino acid is a monomer of a protein, meaning when a bunch of them are put together it’s a protein. And so it is when a bunch of monosaccharides are put together, it makes a polysaccharide
3 0
3 years ago
In a cell undergoing meiosis, during which stage do the sister chromatids separate from each other?
klemol [59]

Answer:

B.) Anaphase II

Explanation:

In metaphase II, the chromosomes line up individually along the metaphase plate. <u>In anaphase II, the sister chromatids separate and are pulled towards opposite poles of the cell.</u> In telophase II, nuclear membranes form around each set of chromosomes, and the chromosomes decondense.

4 0
3 years ago
Why is DNA replication essential for a cell?
Lina20 [59]

Answer:

C. An organism must copy its DNA to pass genetic information to its offspring

Explanation:

Without the copying of the DNA life would not continue as existing organisms would not be able to reproduce and replace themselves.

3 0
2 years ago
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