Five different forces have influenced human evolution are natural selection, random genetic drift, mutation, population mating structure, and culture.
1. Proteins are made from subunits called amino acids. There are 20 different amino acids which are responsible for the variation of proteins. Those amino acids are linked together by peptide bonds and form polypeptide chains. According to the polypeptide structure, there are 4 levels in protein structure as primary structure, secondary structure, tertiary structure and quaternary structure.
2. Starch is a type of carbohydrate. Hence, the subunits of starch are sugar molecules which are called as glucose. The elements of glucose are C,H,O. By linking glucose units with 1-4 alpha glycosidic bonds, the polysaccharide chain is formed. Hence, starch is also a polysaccharide<span>.
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3. DNA is made from subunits called nucleotides. Nucleotides consist of deoxyribose, phosphate group and nitrogenous base.
There are two types of nitrogenous base as purines and pyrimidines. Adenine (A) and guanine (G) are purines and
thymine (T) and cytosine (C) can be seen as pyrimidines. Those nucleotides are linked together by sugar phosphate bonds which are formed between 5' phosphate group and 3' -OH group<span>.</span><span>
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<span>It is true that pritikin diet is often associated with
considerable reduction of blood cholesterol levels could lower heart problems. Pritikin
diet is low in fat, salt and high in fiber or unprocessed whole foods like
fruits, vegetables, low-fat dairy, fish, legumes, and lean proteins. Cardiovascular
exercises or daily walking is encourage to augment the effect of this diet.</span>
they don't transport molecules
I'm thinking possibly d but I'm only a teen and I'm not sure
