Biochemistry Full Test Bank Chapter 1-19 | Questions & well elaborated answers

Biochemistry Full Test Bank Chapter 1-19 | Questions & well elaborated answers-1) The ultimate source of energy for life on earth is . A) The sun B) Geothermal heat C) Carbohydrates D) Fats E) Other organisms 2) Which of the following is not a common component of biomolecules? A) Carbon B) Hydrogen C) Oxygen D) Nitrogen E) Chlorine 3) Which of the following is the basic structural unit of living organisms? A) Nucleus B) Cell membrane C) Tissue D) Cell E) Cytoskeleton 4) Which of the following is not an organelle? A) Mitochondria B) Chloroplast C) Nucleus D) Plasma membrane E) Golgi complex 5) Which of the following is not a role played by carbohydrates in living cells? A) Energy source B) Structural support C) Intercellular communication D) Both A and B are correct E) All are roles played by carbohydrates in living cells 6) Metabolism is best defined as the . A) Reactions of living cells B) Reactions that synthesize large molecules in living cells C) Reactions that degrade molecules in living cells D) Conversion of food molecules to energy E) Reactions that synthesize and degrade molecules in living cells 7) The average life span of a species is about years A) One million B) Ten million C) Five hundred thousand D) Five million E) One hundred thousand 8) Which of the following is not a waste product of living organisms A) Carbon dioxide B) Water C) Urea D) Ammonia E) Glycine 9) Biochemistry is defined as A) The study of life processes B) The study of the molecular basis of life C) The study of living organisms D) The study of organic compounds in living organisms E) The study of living compounds 10) One of the principal methods that organisms use to obtain energy from chemical bonds is by . A) Substitution reactions B) Dehydration reactions C) Oxidation/reduction reactions D) Hydration reactions E) Addition reactions 11) The following is an example of which reaction class? CH3Br + HSCH2CH(NH2)COOH  CH3SCH2CH(NH2)COOH + Br- + H+ A) Substitution B) Elimination C) Addition D) Isomerization E) Oxidation/Reduction 12 The following is an example of which reaction class HOOCCH=CHCOOH + H2O  HOOCCH2CH(OH)COOH A) Substitution B) Elimination C) Addition D) Isomerization E) Oxidation/Reduction 13) The following is an example of which reaction class? CH3CH2OH  CH3CHO + H2O A) Substitution B) Elimination C) Addition D) Isomerization E) Oxidation/Reduction 14) Which of the following is not a component of nucleic acid? A) Nucleotides B) Glucose C) Phosphate group D) Purines E) Pyrimidines 15) The largest molecules in living organisms are . A) proteins B) lipids C) nucleic acids D) carbohydrates E) steroids 16) All of the following classes of compounds are lipids except . A) fats B) sterols C) fatty acids D) phosphoglycerides E) nucleotides 17) Which of the following classes of biomolecules are the most abundant in nature? A) Lipids B) Amino acids C) Carbohydrates D) Proteins E) Nucleotides 18) Consider the following molecule. Which arrow is pointing to a peptide bond?