Question

Why wheat germ and not the whole grain - why is DNA concentrated there? Germ is embryo - seed full of food - carbohydrate - one of 4 biological molecules in cell, DNA is another of biological molecules.? • Why does water make germ swell - diffusion and osmosis? • emulsifying action of soap that breaks up lipid-rich cell membrane • Analyze and explain the chemical and physical phenomena behind this preparation. All the steps of the experiment that lead to extracting DNA exclusive of other cell parts and molecules - action of water, salt, soap, papain, mechanical pressure. • What are the proteins associated with DNA? • If you did not see long strands of DNA, what are the possible reasons? Discuss packing of DNA into chromatin and control of gene expression Chapter 3 your text What is hyperchromicity? Explain the scientific basis of this phenomenon.

Answer 1

Discussion :

1. Wheat germ is only a part of the whole wheat grain. It is a concentrated part which has the maximum nutrients like vitamin E, essential fatty acids, folic acid, zinc, magnesium, phosphate etc. Because wheat germ is the part which sprouts and grow to make a new plant, most nutrients and DNA is required here. DNA is concentrated here because it has the information which is responsible for translation of proteins which is required for the growth.

2. Wheat germ swell because of uptake of water through the process of osmosis. Osmosis is when solvent particles move from high concentration to low concentration via semi permeable membrane.

3. No question.

4. Experiment required.

5. Histone are the proteins associated with the DNA.