Biochemistry, 9th Edition

Chapter 01 Biochemistry: An Evolving Science 1. Which statement about biological diversity is FALSE? a. The plant kingdom includes species as relatively simple as algae and as complex as sequoias. b. No species can live in seemingly hostile environments such as hot springs and glaciers. c. Animal kingdom species range from nearly microscopic to very large. d. Organisms such as protozoa, yeast, and bacteria are present with great diversity in water and soil. e. Microscopic organisms can live on or within larger organisms. ANSWER: b 2. What are molecules A and B called, if molecule A is large and transforms into a low-molecular-weight molecule B? a. A and B are both biological macromolecules. b. A and B are both metabolites. c. A is a biological macromolecule and B is a metabolite. d. A is a metabolite and B is a biological macromolecule. e. A is a protein and B is deoxyribonucleic acid. ANSWER: c 3. Which animal metabolic process is highly similar to the plant process of capturing and converting light energy? a. capturing energy released from acid dissociation b. capturing energy released from DNA double helix formation c. capturing energy released from resisting the change in pH d. capturing energy released from glucose breakdown e. capturing energy released from the breakage of noncovalent bonds ANSWER: d 4. When did life on Earth begin and when did human beings emerge, respectively? a. 3 billion years ago and 1 billion years ago b. 3.5 billion years ago and 0.5 billion years ago c. 3.5 billion years ago and 0.2 billion years ago d. 3.5 billion years ago and less than 0.1 billion years ago e. 3.5 billion years ago and 0.1 billion years ago ANSWER: d 5. What are the main paths of the tree of life? a. eukarya and prokarya b. eukarya and archea c. bacteria, prokarya, eukarya, and archea d. bacteria and eukarya e. bacteria, eukarya, and archea ANSWER: e