front 1 Which of the following descriptions best fits the class of molecules known as nucleotides? | back 1 a nitrogenous base, a phosphate group, and a pentose sugar |
front 2 A molecule with the formula C18H36O2 is probably a | back 2 fatty acid. |
front 3 Which of the following statements best summarizes the differences between DNA and RNA? | back 3 DNA nucleotides contain a different sugar than RNA nucleotides. |
front 4 What aspects of protein structure are stabilized or assisted by hydrogen bonds? | back 4 secondary, tertiary, and quaternary structures, but not primary structure |
front 5 Which class of biological molecules are grouped together because they are hydrophobic? | back 5 lipids |
front 6 Which class of biological molecules are grouped together because their monomers are amino acids? | back 6 proteins |
front 7 What is the structural feature that allows DNA to replicate? | back 7 complementary pairing of the nitrogenous bases |
front 8 Molecules with which functional groups may form polymers via dehydration reactions? | back 8 either hydroxyl or carboxyl groups |
front 9 If cells are grown in a medium containing radioactive 15N, which of these molecules will be labelled? | back 9 both proteins and nucleic acids |
front 10 The basis for diversity, both within a species and among species, is a result of the | back 10 arrangement of a few base molecules into many different macromolecular combinations. |
front 11 The following questions are based on the 15 molecules illustrated in the figure below. Each molecule may be used once, more than once, or not at all. Which of the following molecules consists of a hydrophilic "head" region and a hydrophobic "tail" region? | back 11 5 |
front 12 Which of the following molecules could be joined together by a phosphodiester type of covalent bond? | back 12 11 and 12 |
front 13 Which of the following molecules could be joined together by a peptide bond as a result of a dehydration reaction? | back 13 7 and 8 |
front 14 Which of the following molecules act as building blocks (monomers) of polypeptides? | back 14 2,7, and 8 |
front 15 Which of the following statements is/are true regarding the chemical reaction illustrated in the figure above? | back 15 It results in a peptide bond. |
front 16 Which of the following is an example of hydrolysis? | back 16 the reaction of a fat, forming glycerol and fatty acids with the consumption of water |
front 17 Which level of protein structure do the α helix and the β pleated sheet represent? | back 17 secondary |
front 18 If cells are grown in a medium containing radioactive 35S, which of these molecules will be labelled? | back 18 proteins |
front 19 If a DNA sample were composed of 10% thymine, what would be the percentage of guanine? | back 19 40 |
front 20 Which of the following are nitrogenous bases of the pyrimidine type? | back 20 cytosine and uracil |
front 21 Which bonds are created during the formation of the primary structure of a protein? | back 21 peptide bonds |
front 22 At which level of protein structure are interactions between the side chains (R groups) most important? | back 22 tertiary |
front 23 Which of the following are nitrogenous bases of the purine type? | back 23 guanine and adenine |
front 24 The tertiary structure of a protein is the | back 24 unique three-dimensional shape of the fully folded polypeptide. |
front 25 Which of the following is true of cellulose? | back 25 It is a major structural component of plant cell walls. |
front 26 Which of these classes of biological molecules consist of both small molecules and macromolecular polymers? | back 26 carbohydrates |
front 27 The amino acids of the protein keratin are arranged predominantly in an α helix. This secondary structure is stabilized by | back 27 hydrogen bonds. |
front 28 Normal hemoglobin is a tetramer, consisting of two molecules of β hemoglobin and two molecules of α hemoglobin. In sickle-cell disease, as a result of a single amino acid change, the mutant hemoglobin tetramers associate with each other and assemble into large fibres. Based on this information alone, we can conclude that sickle-cell hemoglobin exhibits | back 28 altered primary structure and altered quaternary structure; the secondary and tertiary structures may or may not be altered. |
front 29 The enzyme amylase can break glycosidic linkages between glucose monomers only if the monomers are the α form. Which of the following could amylase break down? | back 29 glycogen |
front 30 Which of the following polymers contain nitrogen? | back 30 chitin |