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Circle the correct answer: 1. A hydrogen bond is formed between: a. An acid and a base b. High electropositive element and hydrogen c. High electronegative element and oxygen d. A prosthetic group and water 2. When u shake sugar and sand together in a test tube you cause them to form a a. Compound b. Mixture c. Solution d. Suspension 3. Which of the following statements about a compound is true? a. The physical and chemical properties of a compound are usually very different from those of the elements that formed it b. Only the physical properties of a compound are usually the same as those of the elements that formed it c. Only the chemical properties of a compound are usually the same as those of the elements formed it d. Bothe the physical and chemical properties of a compound are usually the same as those of the elements that formed it 4. The amino acids of the protein keratin are arranged on the α-helix. This secondary structure is stabilized by a. Covalent bonds b. Peptide bonds c. Glycosidic bonds d. Polar bonds e. Hydrogen bonds 5. A nucleotide contains a pentose, a phosphate and a(n): a. Lipid b. Acid c. Nitrogen-containing base d. Amino acid e. Glycerol 6. The functional group –NH2 is a(n): a. Amino group b. Carboxyl group c. Hydroxyl group d. Phosphate group e. Carbonyl group 7. The most abundant compound in most living things is: a. Carbon dioxide b. Sodium chloride c. Water d. Sugar 8. The primary structure of a protein is determined by its a. Disulfide bridges b. α- helix structure c. sequence of amino acids d. branching e. three-dimensional structure 9. of the following, the carbohydrate that is not present in animal cells and tissues is: a. glucose b. glycogen c. fructose d. cellulose e. lactose 10. lactose or milk sugar is composed of one glucose unit and one galactose unit. So it can be classified as a. disaccharide b. hexose c. pentose d. polysaccharide e. simple sugar 11. which statement is true a. simple sugars are mode of polysaccharides b. glycerol is made of fatty acids c. RNA molecules are made of nucleotides d. Amino acids are made of proteins 12. Which substance is not a polymer of glucose a. Chitin b. Cellulose c. Glycogen d. Cholesterol e. Starch 13. The atoms that make up carbohydrates are a. C,H and N b. C and H c. C, H, and P d. C,H, and O e. C,H,O, and N 14. glucose and fructose both have the formula 𝐶6 𝐻12 𝑂6 but the atoms in these two compounds are arranged differently. Glucose and fructose are known as a. monosaccharides b. polysaccharides c. oligosaccharides d. pentoses e. steroids 15. which parts of the amino acids are involved in peptide bonds a. the carboxyl group on one amino acid and the side chain on the other b. the carboxyl group on both amino acids c. the amino group on one amino acid and the carboxyl group on the other d. the amino group on both amino acids 16. which part of the amino acid gives its unique properties a. the amino group b. the carboxyl group c. the side chain (R-group) d. the hydrogen 17. a major difference in the structure of proteins, fats, and carbohydrates is the only proteins always contain a. carbon b. oxygen c. hydrogen d. nitrogen e. sodium 18. what are the repeating units of nucleic acid a. nucleotides b. phosphate molecule c. sugar molecules d. bases 19. which one of the following is nt a valid comparison between DNA and RNA? a. Double stranded-single stranded b. Found in nucleus-found in cytoplasm c. Deoxyribose-ribose d. Adenine-thymine 20. There are several levels of protein structure, the most complex one is a. Primary b. Secondary c. Tertiary d. Quaternary 21. Nucleic acids are chains of 5 carbon sugars linked by bonds with an organic base protruding from each sugar a. Amino b. Covalent c. Carboxyl d. Phosphate 22. The monomers that makeup polymeric carbohydrates like starch are called a. Nucleotides b. Monosaccharides c. Nucleosides d. Fatty acids 23. Which of the following is not a lipid a. Chitin b. Steroids c. Waxes d. Unsaturated fat 24. Double helix describes the structure of a molecule of a. Protein b. Disaccharide c. Starch d. Monosaccharide e. DNA 25. the PH scale measures a. the OH − concentration b. the H+ concentration c. water concentration d. all of the above 26. which of the following is not a disaccharide a. sucrose b. maltose c. lactose d. amylose e. all of the above 27. deoxyribonucleic acid belongs to which of the below macromolecules a. carbohydrates b. lipids c. proteins d. nucleic acid e. none of the above 28. 𝐶12 𝐻22 𝑂11 a. Carbohydrate b. Lipids c. Proteins d. Nucleic acid 29. Polymerization reactions in which proteins are synthesized from amino acids a. Require energy b. Results in the formation of water c. Condensation reactions d. Are dehydration reactions e. All of the above 30. Animals store glucose in the form of a. Amylose b. Glycogen c. Glycerol d. Guanine e. Cellulose 31. What type of bond would join two amino acid subunit? a. Ionic bond b. Van der waals bond c. Hydrogen bond d. Peptide bond 32. Triglycerides contain fatty acids and a. Glucose b. Glycogen c. Glycerol d. Guanine e. An amino group 33. Which of the following nitrogenous bases is found in the DNA but is not in the RNA a. Adenine b. Guanine c. Cytosine d. Thymine e. Uracil 34. Compared to most other substances a great deal of heat is needed to raise the temperature of water by a given amount. This is because a. Is an acid b. Readily forms solutions c. Has a high heat capacity d. Acts as a buffer 35. In the formation of a macromolecule, what type of reaction would join two subunits together? a. Hydrophobic reaction b. Hydrolysis reaction c. Dehydration reaction d. Denaturation reaction 36. A covalent bond is formed by a. Transfer of electron b. Sharing of electron c. Cations and anions d. High electronegative element and low one 37. The sequence of amino acids in a polypeptide is called the a. Primary structure b. Secondary structure c. Tertiary structure d. Quaternary structure 38. Assuming they all had the same number of carbon atoms, which of the following has the most CH bonds Unsaturated fat Polyunsaturated fat Polysaccharide Saturated fat 39. In a DNA molecule, what holds together nitrogenous bases from the two polymer chains? a. Phosphodiester bonds b. Ionic bonds c. Covalent bonds d. Peptide bonds e. Hydrogen bonds 40. What happens during a hydrolysis reaction a. Protein coils into its secondary structure b. The bind between two subunits of a macromolecule is broken c. Saturated fats become unsaturated d. A bond is formed between two subunits of a macromolecule e. Water breaks ionic bonds 0 a. b. c. d.