The answer is d
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Answer:
The correct answer is- Pharynx
Explanation:
Pharynx is a muscular tube that connects the nasal cavity to the larynx and oral cavity to the esophagus. A common passage is provided by pharynx for food and air.
Pharynx gets divided into three regions which are nasopharynx, oropharynx, laryngopharynx. Nasopharynx is the first portion of pharynx that connects the nasal cavity to it.
Oryngopharynx makes the middle portion of pharynx and acts as a passageway of food from mouth. Larygopharynx is the last portion that guides air towards larynx and food towards the esophagus. So the right answer is pharynx.
<u>X-Ray crystallography</u> was the technique that helped Watson and crick in developing their model for the structure of DNA.
A crystal's crystalline structure causes a beam of incident X-rays to diffract into a variety of distinct directions, which is how X-ray crystallography, an experimental science, determines a crystal's atomic and molecular structure.
Famous researchers Watson and Crick made history by figuring out the structure of DNA. They discovered that DNA is composed of two strands wound around one another to form a double-helical structure using X-ray crystallography. It was developed by Rosalind Franklin using an approach called X-ray crystallography and showed the DNA molecule's helical structure. The genetic code for all living things is encoded in two chains of nucleotide pairs that make up DNA, as Watson and Crick discovered.
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Answer:
EtBr inserts between the stacked bases in the DNA double helix.
Explanation:
- EtBr is used for visualizing DNA bands as it fluoresces under the UV illumination.
- EtBr is an aromatic compound that is capable of inserting itself between the stacked bases of the DNA double helix.
- The hydrophobic environment around the base pairs where the EtBr intercalates is responsible for the fluorescence. As the EtBr molecule intercalates between these base pairs the cation of EtBr sheds the water molecules associated with it and this causes it to fluoresce under UV light as water is a quencher of fluorescence.
The process where toxic substances move up the food chain and become more concentrated at each level.