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sesenic [268]
3 years ago
8

The Meselson-Stahl experiment demonstrated that DNA replication is semiconservative. In the figure, semiconservative replication

is
illustrated by
A.C
B.A
C.B
D. A mix of these methods, depending on the cell type​

Biology
2 answers:
vovikov84 [41]3 years ago
8 0

Answer:

b

Explanation:

There were three models for how organisms might replicate their DNA: semi-conservative, conservative, and dispersive.

The semi-conservative model, in which each strand of DNA serves as a template to make a new, complementary strand, seemed most likely based on DNA's structure.

The models were tested by Meselson and Stahl, who labeled the DNA of bacteria across generations using isotopes of nitrogen.

From the patterns of DNA labeling they saw, Meselson and Stahl confirmed that DNA is replicated semi-conservatively.

Mode of DNA replication

Imagine yourself in 1953, after the double helix structure of DNA has just been discovered^1  

1

start superscript, 1, end superscript. What burning questions might be on your mind, and on the minds of other scientists?

One big question concerned DNA replication. The structure of the DNA double helix provided a tantalizing hint about how copying might take place^{1,2}  

1,2

mafiozo [28]3 years ago
8 0

Answer:

B

Explanation:

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Why is soil important?
balandron [24]

Answer:

1- Soil filters our water, provides essential nutrients to our forests and crops, and helps regulate the Earth's temperature as well as many of the important greenhouse gases.

2- Soil erosion is the displacement of the upper layer of soil; it is a form of soil degradation. This natural process is caused by the dynamic activity of erosive agents, that is, water, ice, snow, air, plants, animals, and humans.

3- Humans affect erosion rates in a number of ways across the globe. ... Human activities such as repeatedly walking or biking the same trails or areas can also contribute to erosion slowly over time. Forest fires also contribute to soil erosion, as vegetation previously holding the soil in place is often destroyed

4 - The effects of soil erosion go beyond the loss of fertile land. It has led to increased pollution and sedimentation in streams and rivers, clogging these waterways and causing declines in fish and other species. And degraded lands are also often less able to hold onto water, which can worsen flooding.

5 - You can reduce soil erosion by:

Maintaining a healthy, perennial plant cover.

Mulching.

Planting a cover crop – such as winter rye in vegetable gardens. ...

Placing crushed stone, wood chips, and other similar materials in heavily used areas where vegetation is hard to establish and maintain.

Explanation:

7 0
3 years ago
Read 2 more answers
Why is cell division important for both single-celled and multicellular organisms?
vovikov84 [41]

Answer:

Because it is a mode for reproduction and growth.

Explanation:

Cell division is important for both single-celled as well as multi-cellular organisms.

In single-celled organisms, the cell division is the process which helps them to reproduce and form new organisms.

In multi-cellular organism, the cell division becomes more important because both, the division and growth in cells of multi-cellular organism occurs by means of cell division. When cells divide, the number of cells increases and it is seen as a overall growth in the organism. Damaged tissue repair is also accomplished by the cell division itself.

6 0
3 years ago
An action potential in one segment of axon causes adjacent sections of axon membrane to reach threshold through what mechanism?
Furkat [3]
<h3>Answer:</h3>

The generation of local currents.

<h3>Explanation:</h3>

An action potential at the axon hillock generates local currents that depolarize nearby sections of axon to threshold. This change in membrane potential causes voltage-gated Na+ channels to open in the adjacent axon segment. This generates/regenerates the action potential in the adjacent segment, causing the action potential to propagate away from the axon hillock.

5 0
3 years ago
How do striated and smooth muscles differ?
Serggg [28]
I have also given you the skeletal muscle difference ......
For extra knowledge ......
hope it helps u ....then mark me as brainliest

5 0
3 years ago
Starchy grain is dominant over sugary corn. If, in a cross between these types, 58 of the progeny are sugary, how many of the pr
DaniilM [7]

Let us solve first the phenotype of this problem.

Starchy grain = AA (dominant)

Sugary Corn = aa (recessive)

AA x aa = AaAa ; AaAa

<span>     A    A</span>

<span>a  Aa   Aa</span>

<span>a  Aa   Aa</span>

The result of the cross is that the progeny will become heterozygous.

<span>If there is 58 progeny sugary, there will also be 58 starchy. It is 50%.</span>

5 0
3 years ago
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