Answer and Explanation:
There are three basic steps as initiation, extension and termination which occur in both eukaryotes and prokaryotes. For transcription of a gene to occur, the DNA double helix unwinds over a short region.
initiation: RNA polymerase enzyme is linked to specific portions called as promoter in DNA to start RNA synthesis after the DNA unwinds.
Elongation: the enzyme synthesizes RNA strand along the DNA chain.
Termination: RNA synthesis continues along the DNA strand until it encounters a signal representing termination of the process. The termination process happens as the transcription complex separation takes place on the DNA sequence.
When assembled in the nucleus,mRNA peels off and moves to the cytoplasm. Here, it attaches to the ribosomes.Protein synthesis is started with AUG codon which is at the beginning of the mRNA-carried code. As the mRNA moves along the ribosome its information is translated into the appropriate amino acids which are assembled into a polypeptide. this is called translaton.
The best answer is D. He extracted and observed DNA from white blood cells. He is a Swiss physician and a biologist who is known to be the first researcher to identify nucleic acid. He isolated various phosphate-rich chemicals , which he called nuclein or what we know now as nucleic acid, from white blood cells' nuclei which paved the way for him to discover and identify DNA.
Answer:
contour farming
Explanation:
Contour farming is the method of growing crops on sides of hills, mountains and steep slopes by planting on graduated terraces built into the slope. This method effectively reduce soil erosion and water loss and maximizes arable land area. In most of the systems the contours are low, flat ridge of earth built across the slope, with a channel for runoff water just above the ridge. In areas where soils are able to take in water and rainfall amount is relatively low, level terraces may be used to reduce soil erosion too.
The most famous cancer cells are called HeLa cells. They're named HeLa cells after the young woman whose cervical cancer cells were biopsied to create this immortal line of cells: Henrietta Lacks. Her cells are still used to today in cancer research.
Side note: Her cells were used WITHOUT her consent and without any type of compensation for her contribution. Her case has been a big source of debate in the biomedical ethics community about consent and racial disparities in healthcare.