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Quiz 1 Solution 1. Which of these scientific terms has the greatest degree of certainty? a) hypothesis; b) theory; c) law; d) guess 2. Which of the following is the least inclusive (smallest) unit of classification? a) kingdom; b) species; c) genus; d) class; e) phylum 3. Bacteria belong to the taxonomic kingdom a) Plantae; b) Protista; c) Animalia; d) Fungi; e) Monera 4. Heterotrophic organisms obtain their food a) from another creature; b) by photosynthesis; c) by chemical synthesis; d) by ATP synthesis. 5. A substance that neutralizes small amounts of acids or bases added to a solution is a buffer. 6. Molecules with a slightly negative end and a slightly positive end are called bipolar. 7. The monomer that makes up polysaccharides is . a) amino acids; b) glucose; c) fatty acids; d) nucleotides; e) glycerol 8. The chemical reaction where water is removed during the formation of a covalent bond linking two monomers is known as. a) dehydration; b) hydrolysis; c) photosynthesis; d) protein synthesis 9. Proteins are composed of which of these monomers? a) amino acids; b) glucose; c) fatty acids; d) nucleotides; e) glycerol 10. Which of these is not a function of lipids? a) long term energy storage; b) structures in cells; c) hormones; d) enzymes; e) sex hormones 11. All living things use the same amino acids. a) 4; b) 20; c) 100; d) 64 12. The sequence of ___ bases determines the ___ structure of a protein. a) RNA, secondary; b) DNA, quaternary; c) DNA, primary; d) RNA, primary 13. Which of these is not a nucleotide base found in DNA? a) uracil; b) adenine; c) guanine; d) thymine; e) cytosine 14. Which of these carbohydrates constitutes the bulk of dietary fiber? a) starch; b) cellulose; c) glucose; d) fructose; e) chitin 15. Phospholipids are important components in . a) cell walls; b) cytoplasm; c) DNA; d) cell membranes; e) cholesterol 16. Organic molecules that catalyze reactions in living systems are enzymes. 17. Which of the following graphs best represents the effect of substrate concentration on the rate of an enzyme catalysed reaction? a) b) rate concentration c) d) 18. Which of the following graphs best represents the effect of temperature on the rate of an enzyme catalysed reaction? a) b) rate concentration d) d) 19. Antibiotics are _________ a) reversible non-competitive inhibitors, b) competitive inhibitors, c) allosteric, d) enzyme co-factors. 20. Nerve gas is an example of a: a) reversible non-competitive inhibitor, b) competitive inhibitor, c) allosteric inhibitor, d) irreversible non-competitive inhibitor.