Question 11 Not yet answered Marked out of 1.14 when your hair is dirty, it usua

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Question 11 Not yet answered Marked out of 1.14 when your hair is dirty, it usually feels oily, and you wash it with shampoo. Tap into your vast knowledge of chemistry and explain why shampoo is needed to clean your hair? Select one a. Water is polar b. Oil is non-polar C. Shampoo is amphipathic d. A, B and C Flag question e. Shampoo is not necessary to clean your oily hair, water alone would clean it Question 12 Not yet answered Marked out of 1.14 Which group of biological molecule is the main component of all cell membranes? Select one a. Carbohydrates b. Lipids Flag question c. Protein:s d. Nucleic acids e. DNA Question 13 Not yet answered Marked out of 1.14 Which group of biological molecule provides the structural support in plant cell walls? Select one a. Carbohydrates b. Lipids c. Proteins d. Nucleic acids e. None of these Flag question

Explanation / Answer

11) d. A B and C .Water is polar and oil is nonpolar, their molecules are not attracted to each other. The molecules of a polar solvent like water are attracted to other polar molecules.Shampoo is amphiphatic.It is hydrophobic, which hydrocarbon portion of the molecule binds to the sebum coating hair, as well as to any oily styling products. It also have a hydrophilic portion, so when you rinse your hair, the detergent is swept away by the water, carrying sebum away with it.

12) b. Lipids and proteins both are the main components of cell membrane.

But most is lipids.The major component of the cell membrane is the lipids. lipids are fats that form the majority of the membrane. They are arranged in a double layer so that the tails face inward. This arrangement works because the head of the phospholipid is hydrophilic and immerses itself inside the watery environment inside and outside the cell.

13) a. Carbohydrates groups of biological molecule provides the structural support in plant cell walls.In plants, the cell wall is composed mainly of strong fibers of the carbohydrate polymer cellulose. Cellulose is the major component of cotton fiber and wood and is used in paper production.

14) c.Proteins groups of biological molecule would you expect to find in the highest concentration in a hibernating bear.Hibernating bears are able to recycle their proteins and urine, allowing them both to stop urinating for months and to avoid muscle atrophy.

15) d. Nucleic acid macromolecule is composed of subunits or monomers containg a sugar, a phosphate group and a nitrogen containg base.Nucleic acids are polymers of individual nucleotide monomers. Each nucleotide is composed of three parts: a 5-carbon sugar, a phosphate group, and a nitrogenous base.

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