24. Deorxyribose is a sugar found in C. DNA E. ATP 16. A bond created from the s

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24. Deorxyribose is a sugar found in C. DNA E. ATP 16. A bond created from the sharing of electrons between two atoms is a(a)ond. B. starch. A. covalent B. hydrogen D. RNA C.ionie D. metallis 25·The building blocks of proteins A. re 17. When one atom has a stronger attraction for shared electrons in a bond than the other atom. a(an) covalent boed is formed. C. amino acids. D. monosaccharides. A. polar B. nonpolar C. ionie 26. Adjacent amino acids in a polypeptide chain are beld together by A. hydrogen bonds B. ionic bonds. D. metallie 18. The pH of the blood is slighdy basic. Which of the following describes this pH? A. 64 C. Van der Waals bonds. B. 12.6 C.4.7 D. peptide bonds E. high energy bonds D. 74 19. A pH of 5.5 would be considered A. acidic B. basie. C. neutral A. a combination of atoms held together by chemical bonds. B. a positively charged ion C. a negatively charged ion. D. a substance that conducts electricity when placed in 20Two atoms with the same number of protons and electrons, but ifferent numbers of neutrons, are called A. isotopes B. ions. E. the alteration in the three-dimensional structure of a protein 28. Nucleotides A. are part of DNA molecules but not RNA molecules. B. hold the nucleus together C. are the repeating units of nucleic acids. D. are proteins that function as enzymes. E. have nothing to do with the genetic information in the C. electrolytes compounds. E. Both ions and electrolytes are correct names. 21. Entropy is A. complexity B. order. C. Both order and disorder are correct. D. Both complexsity and disorder are correct E. disorder 29. Which of the following lists the components of a nucleotide? A. phosphate- lipid-organic base B. monosaccharide-organic base- sucrose C. D. monosaccharide-organie base 22. Which best describes the first law of thermodynamics? A. Some useful energy is lost as heat whenever an energy transfer occurs. B. Energy transfers are always 100% efficient in changing energy from one useful form to another C. Energy is not created nor destroyed, but it can change from one energy form to another. D. Energy can be created from matter or used to produce matter E. Energy is changed from one form to another with a loss of usable energy E. monosaccharide-amino acid-phosphate 30·The four main categories of organic macromolecules are A. monosaccharides, disaccharides, trisaccharides, and B. proteins, DNA, waxes, and sugars C. carbohydrates, lipids, proteins, and nucleic acids. D. RNA, DNA, steroids, and fats. E. lipids, starches, DNA, and protein 23. The Second Law of Thermodynamics simply states that A. energy can be created but not destroyed. B. energy can be recycled through the universe. C. disorder in the universe is continually increasing D. energy cannot be created or destroyed, just changed from 31. Which of the following is a nucleic acid? A. DNA B. RNA C. Both DNA and RNA D. None of these choices are correct. one form to another. E. energy is constantly being created in the universe.

Explanation / Answer

16. Option A is correct.

A covalent bond is formed by sharing an electron pair between two atoms.

17. Option A is correct.

When the bonded electrons are attracted more towards a highly electronegative atom in a covalent bond, such a bond is known as polar covalent bond.

18. Option D is correct.

pH of the blood = 7.4

19. Option A is correct.

Acids = pH 1 to pH 6.9

Bases = pH 7.1 to 14

Neutral = pH 7

20. A

21. B

22. C

23. C

24. C

25. C

26. D

27. E

28. C

29. C

30. C

31. C

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