What was the main technological advancement that contributed to Crick and Watson working out the structure of the DNA double helix?
Taken in 1952, this image is the first X-ray picture of DNA, which led to the discovery of its molecular structure by Watson and Crick. Created by Rosalind Franklin using a technique called X-ray crystallography, it revealed the helical shape of the DNA molecule.
Which scientist S is are correctly paired with their contribution to the discovery of the structure of DNA?
The 3-dimensional double helix structure of DNA, correctly elucidated by James Watson and Francis Crick. Complementary bases are held together as a pair by hydrogen bonds.
What are the exceptions to the general rule that DNA is the genetic material in all organisms?
The general exceptions to DNA being the genetic information for all organisms are viruses. Viruses have many different variations of genetic information including double-stranded DNA, double-stranded RNA and single-stranded RNA.
What did Watson and Crick contribute to the discovery of DNA?
Watson and Crick developed their ideas about genetic replication in a second article in Nature, published on May 30, 1953. The two had shown that in DNA, form is function: the double-stranded molecule could both produce exact copies of itself and carry genetic instructions.
What conclusions did Watson and Crick reach after seeing this image and reading Franklin’s report discussing the symmetry of DNA?
After seeing Franklin's x-ray images of DNA and her report on DNA's symmetry, Watson and Crick built a revised model of DNA's structure: a double helix with sugar-phosphate backbones running in opposite directions.
What are the experimental prove of the genetic materials?
In 1952, Alfred Hershey and Martha Chase took an effort to find the genetic material in organisms. Their experiments led to an unequivocal proof to DNA as genetic material. Bacteriophages (viruses that affect bacteria) were the key element for Hershey and Chase experiment.
Which of the following was a critical experimental innovation employed by Mendel that distinguished his experiments from those of his contemporaries?
Which of the following was a critical experimental innovation employed by Mendel that distinguished his experiments from those of his contemporaries? Mendel performed controlled crosses with pure-breeding strains.
What was the Watson and Crick experiment?
Watson and Crick showed that each strand of the DNA molecule was a template for the other. During cell division the two strands separate and on each strand a new "other half" is built, just like the one before.
What did Watson Crick and Franklin discover?
the double helix The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology, which is largely concerned with understanding how genes control the chemical processes within …
Which statement best describes how Watson and Crick’s model used other scientists work to create a model of DNA?
Which statement best describes how Watson and Crick's model used other scientists' work to create a model of DNA? They used Chargaff's rule to determine that it contains ribose sugar.
What did Watson and Crick discover?
The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology, which is largely concerned with understanding how genes control the chemical processes within …
What evidence allowed Hershey and Chase to show that DNA alone carried the genetic information of a bacteriophage?
What was the key factor that allowed Hershey and Chase to show that DNA alone carried the genetic information of a bacteriophage? DNA contains phosphorus, but protein does not. Protein contains sulfur, but DNA does not. This allowed radioactive phosphorus and radioactive sulfur to identity each molecule specifically.
What were Mendel’s two main conclusions about how traits are passed between generations?
What were Mendel's two main conclusions about how traits are passed between generations? Organisms inherit two copies of each gene, one from each parent. Organisms donate only one copy of each gene in their gametes. Thus, the two copies of each gene segregate during gamete formation.
What were the major conclusions of Mendel’s experiment?
Upon compiling his results for many thousands of plants, Mendel concluded that the characteristics could be divided into expressed and latent traits. He called these dominant and recessive traits, respectively. Dominant traits are those that are inherited unchanged in a hybridization.
Why was the discovery of DNA in 1953 so important?
Why was the discovery of DNA in 1953 so important? It began the search for gene therapy to cure inherited diseases.
Who are Watson and Crick and what did they discover?
On February 28, 1953, Cambridge University scientists James D. Watson and Francis H.C. Crick announce that they have determined the double-helix structure of DNA, the molecule containing human genes.
What facts about DNA does the Watson Crick model explain?
With the aid of illustrations, Watson and Crick state that their model of DNA consists of two helical strands twisted around each other in a double helix. Each strand, the authors explain, contains a chain of repeating units called nucleotides, where each nucleotide contains a sugar, a phosphate group, and a base.
How Hershey and Chase to prove that DNA is the genetic material?
In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
What evidence from the Hershey-Chase experiment demonstrated that DNA not protein is the genetic material?
So, the correct option is 'Phosphate was used to tag DNA because DNA contains phosphorus within its structure (specifically the backbone), while proteins do not, and would make the bacterial cell radioactive as DNA entered and took over control.
How did Mendel prove that traits are inherited independently?
Answer: Mendel's dihybrid cross shows that traits are inherited independently. When a cross was made between a green pea plant with round seeds and a yellow pea plant with wrinkled seeds , the F 1 progeny plants were all yellow with round seeds. This indicated that yellow color and round seeds were the dominant traits.
What was the most significant conclusion that Mendel draw from his experiment with pea plant?
So, the correct option is 'Traits are inherited in discrete units one from each parent'.
What observations did Mendel make during his experiments?
Answer: During this time, Mendel observed seven different characteristics in the pea plants, and each of these characteristics had two forms . The characteristics included height (tall or short), pod shape (inflated or constricted), seed shape (smooth or winkled), pea color (green or yellow), and so on.
What evidence did Watson and Crick have?
Watson and Crick developed their ideas about genetic replication in a second article in Nature, published on May 30, 1953. The two had shown that in DNA, form is function: the double-stranded molecule could both produce exact copies of itself and carry genetic instructions.
What piece of evidence from the Hershey-Chase experiment proved that DNA is the molecule of heredity?
In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
What did Hershey and Chase use in their experiment?
The Hershey and Chase experiments used bacteriophages, or viruses capable of infecting bacteria, in order to determine whether genes were made of proteins or DNA. Hershey and Chase labeled the protein coats of one set of bacteriophages with sulfur and the DNA of a second set with phosphorus.
How did the Hershey-Chase experiment provide evidence that DNA is our genetic material?
In their experiments, Hershey and Chase showed that when bacteriophages, which are composed of DNA and protein, infect bacteria, their DNA enters the host bacterial cell, but most of their protein does not. Hershey and Chase and subsequent discoveries all served to prove that DNA is the hereditary material.
What is observed by Mendel in his experiment about the phenotype and genotype?
Mendel used pea plants with seven distinct traits or phenotypes to determine the pattern of inheritance and the underlying genotypes. Mendel found that crossing two purebred pea plants which expressed different traits resulted in an F1generation where all the pea plants expressed the same trait or phenotype.
What were the major conclusions of Mendels experiment?
Upon compiling his results for many thousands of plants, Mendel concluded that the characteristics could be divided into expressed and latent traits. He called these dominant and recessive traits, respectively. Dominant traits are those that are inherited unchanged in a hybridization.
Why was the pea plant used in Mendel’s experiments?
Solution: Pea plants were chosen for Mendel's experiments because they are easy to grow, have a short life period, and produce larger flowers. Pea plants are also self-pollinated.
What observation did Mendel make and what problem did he have to solve?
What observations did mendel make and what problem did he have to solve? none of the indiv traits studied were blending in the offspring of a cross between 2 purebred parents. in the hybrid, one of the 2 traits was seen. He had to figure out why only one trait was seen in the hybrid offspring of the pure bred crosses.