Proteins differ from one another because A) the number of nucleotides found in e

Question

Proteins differ from one another because A) the number of nucleotides found in each protein varies from molecule to molecule B) the sequence of amino adds in the polypeptide chain differs from protein to protein. C) the peptide bonds linking amino acids differ from protein to protein D) each protein contains its own unique sequence of sugar molecules The storage form of carbohydrates is __________ in animals and _________ in plants. A) starch; glycogen B) cellulose; glycogen C) glycogen; starch D) glycogen; cellulose Which of the following statements about enzymes is false? A) They are monomers used to build proteins. B) They increase the rate of chemical reactions. C) They function as chemical catalysts. D) They regulate virtually all chemical reactions in a cell. How are these two amino acids attached together? A) carboxylic acid group to carboxylic add group B) amino group to amino group C) through a hydrolysis reaction D) ammo group to carboxylic acid group Fatty adds are A) composed of four linked rings. B) composed of carbon, hydrogen, glycerol, and a phosphate group C) hydrophobic D) composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio. Lysozyme is an enzyme that breaks down bacterial cell walls and is found in your tears. mucus, and saliva. A mutation occurs in the gene for lysozyme that results in a Iysine (a positively charged amino acid) being substituted for an arginine (also a positively charged ammo acid). Do you think that the mutant lysozyme will function similarly to the normal lysozyme? A) yes because protein function stays the same no matter what mutations occur B) yes, because both lysine and arginine are positively charged the so the tertiary structure and therefore function should be similar C) no, because all changes in protein primary sequence result in functional differences D) no, because changing lysine to arginine will cause the protein to denature Which of the following characteristics of protein will remain intact if the protein is denatured? A) the function of the protein B) the binding properties of the protein C) the shape of the protein D) the number of amino acids in the protein

Explanation / Answer

14. Different proteins are formed from different orders of amino acids. As there are varieties of amino acids, they fit in everywhere possible in a polymer chain. This way, different proteins are formed. So (B)

15. In animals, carbohydrates are converted by the liver into complex chains of glucose called glycogen. Glycogen is stored in liver and muscle cells and is a secondary source of energy to freely circulating blood glucose. Plants form starches, which are also called complex carbohydrates, by stringing together sugars. Starch are stored in amyloplast. So (C)

16. The monomers that make proteins are amino acids. So (A)

17.  The linking of two amino acids is accompanied by the loss of a molecule of water with an OH from carboxylic acid group and a one H from amino group. So (D)

18. The long Hydrocarbon chain of the fatty acid is highly non-polar and therefore water insoluble (hydrophobic, which means scared of water). So (C)

19.

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