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vodka [1.7K]
3 years ago
5

Which best summarizes the scientific process that led to our current understanding of DNA? Please help

Physics
2 answers:
solniwko [45]3 years ago
7 0

The answer is B.)

This is because for years scientists have build up and found discoveries that led to recent discoveries brought by previous scientists.

Hope this helps

Fynjy0 [20]3 years ago
3 0

Answer:

The correct answer will be option-B.

Explanation:

The information about DNA we know today form what, structure and functional aspects is the result of the contributions of the discoveries made by the scientists in the past.

The story of DNA begins with the identification of molecule by Johann Friedrich Miescher in the 1860s, identification of its monomers by Albrecht Kossel in 1881, functional role as the genetic material of the organism by the experiments of Hershey and Chase in 1928 and the double-helical model by Watson and Crick shows in 1953 and many other related discoveries by other scientists shows us that new discoveries are made on the basis of work of the other scientists which live or lived in the past.

Thus, Option-B is the correct answer.

The history of the discovery of DNA as genetic material of the organisms konwn to us today statred in 19th century when

Johann Friedrich Miescher

1860s

Chromosomes were first observed in plant cells by Swiss botanist Karl Wilhelm von Nägeli in 1842,

Felice Fontana discovered the nucleolus in eel cells in the year 1774

Hershey-Chase experiment shows that DNA

James Watson & Francis Crick suggest the first correct double-helix model of DNA structure

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3. It is not changing at that time

Explanation:

If the acceleration of a body is zero at some instant in time, it implies that the velocity is not changing at that point in time. Velocity is the rate of change of displacement with time.

✓Acceleration and velocity shares a very close relationship.

✓ For a body to accelerate, the velocity must change. Acceleration is defined as the rate of change of velocity with time.

✓If at any point, a body moves with constant velocity i.e the velocity does not change with time, the acceleration becomes zero.

✓ For acceleration to occur, a body must change velocity.

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How high up is a 3.00 kg object that has 300.j of energy
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Explanation:

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2 years ago
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2. From the preceding calculation, it should be obvious that to experimentally time the
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the kinematics relations we were able to find the correct results:

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The kinematics allows finding the relationships between the position, the velocity and the acceleration of the bodies, in this case the boy is in free fall down the cliff, as he has a stopwatch in his hand he can mark the position every second that he falls, taken the downward direction as positive.

             y = y₀ + v₀ t + ½ g t²

Where y and i are the current and initial height, vo the initial velocity, g the acceleration of gravity and t the time

As it is dropped, its initial velocity is zero and we place the zero of the reference system at the top of the cliff y₀ = 0

            y = 0 + 0 + ½ g t²

            y =  ½  g t²

            y = ½ 32.16 f²

          y = 16.08 t²

Table 1 shows the distances for the first 5 seconds of the fall

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  0           0

   1          16.08

   2         64.32

   3        144.72

   4        257.28

   5 402.0

In the attachment you can see a graph of distance versus time for this movement

b) We look for the time to obtain the speed of 60 mi / h

Let's reduce units of  the speed to ft / s

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Let's use the kinematics relation

          v = v₀ + g t

           t = \frac{v -v_o}{g}

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Using the kinematics relations we were able to find the correct results

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