Many scientists worked together to form a realistic model of the structure of the DNA molecule.

1 answer:

8 0

A) Chargaff discovered two rules that helped to reveal the structure of the double helicon DNA. Chargaff's rules claim that the DNA from any cell and any organism should have a 1: 1 ratio (base pair rule) of pyrimidine and purine bases, and more specifically that the amount of guanine is equal to the amount of cytosine, and the amount of adenine is equal to the amount of thymine. This form was found in both DNA strands.

B) James Watson and Francis Crick in 1953 proposed the first correct model of the double helicon DNA structure. Their model was based on only one X-ray diffraction image recorded by Rosalind Franklin and Raymond Gosling in May 1952, as well as information that the DNA bases ware paired, which came out of private communication with Erwin Chargaff during the previous years. Chargéff's rules played a very important role in determining the configuration of double helices for B-DNA as well as for A-DNA.

You might be interested in

As competition has become truly global, free trade has resulted in _____ prices and _____ quality across virtually every product

Andrews [41]

Answer:

lower prices and higher quality

Explanation:

Remember that the competition will make that more people is selling the same or similar products. Because of competition, the sellers most make an effort to offer better products, maybe because is a different material, maybe because the process is cheaper. Free trade will open a door to any seller around the world to sell with quality the products but at the same time to reduce the math examn.

3 0

3 years ago

If an organism has more specialized cells, its cells Blank Space __________.

jeka57 [31]

I think the answer to this is 2.

4 0

4 years ago

In which population was natural selection not the reason for the difference in fitness?

antoniya [11.8K]

Although the operation of natural selection requires that genotypes differ in fitness, for some geneticists it seems easier to understand natural selection than fitness. Partly this reflects the fact that the word “fitness” has been used to mean subtly different things. Here I distinguish among these meanings (e.g., individual versus absolute versus relative fitness) and explain how evolutionary geneticists use fitness to predict changes in the genetic composition

5 0

3 years ago

Skin color is determined by three to five gene pairs. this makes skin color

kolezko [41]

Pigment photosynthesis and the comeellianGene

7 0

4 years ago

You are traveling across the Pacific Ocean when you come across a small island, island #1. There is lush vegetation and several

Sauron [17]

Answer:

The correct answer is (a). The brown beetle migrated to island #1 and gave rise to the colored species on island #2 through adaptive radiation.

Explanation:

As there are no brown beetles on the island 1, and island 2 has less biodiversity of plants, it's possible to think that the brown beetle migrated to island 1 where there are many kinds of different plants, which would lead to the adaptation of these organisms resulting in many different species.

7 0

3 years ago