Exam 3: Carbon and the Molecular Diversity of Life

DNase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together.What would first happen to DNA molecules treated with DNase?

Polysaccharides,triacylglycerols,and proteins are similar in that they are

Which of the following molecules lacks amino acids?

Figure 3.10 What is the structure shown in Figure 3.10?

Hydroxyl groups are the primary chemical group associated with a particular biologically important macromolecule.Which of the following statements regarding this macromolecule is true?

Normal hemoglobin is a tetramer,consisting of two molecules of β-globin and two molecules of α-globin.In sickle-cell disease,because of a single amino acid change,the mutant hemoglobin tetramers associate with each other and assemble into large fibers.Based on this information alone,we can conclude that sickle-cell hemoglobin exhibits

Figure 3.5 -Which molecule shown in Figure 3.5 can increase the concentration of hydrogen ions in a solution and is therefore an organic acid?

Which of the following functional groups confers the properties of an acid on amino acids?

Changing a single amino acid in a protein consisting of 433 amino acids would

Hydrogenated vegetable oil is the primary ingredient in margarine.How does hydrogenated vegetable oil differ from nonhydrogenated vegetable oil?

Figure 3.8 -Which of the following statements regarding the molecule illustrated in Figure 3.8 is true?

The tertiary structure of a polypeptide is the

Which of the following statements is true regarding cellulose?

A new organism is discovered in the forests of Costa Rica.Scientists there determine that the polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences from humans,65 differences from a gibbon,49 differences from a rat,and 5 differences from a frog.These data suggest that the new organism is more closely related to

Which of the following chemical equations describes a dehydration reaction?

Which of the following molecules is not a polymer synthesized from several simple monomers?

A disulfide bridge is an example of which type of bond?

Figure 3.4 -Which of the groups shown in Figure 3.4 is a functional group that helps stabilize proteins by forming covalent cross-links within or between protein molecules?

Figure 3.5 -Which molecule shown in Figure 3.5 has a carbonyl functional group in the form of an aldehyde?

Which functional group is not present in this molecule?