Pearson Biology-3: The Molecules of Cells Exam Questions with Complete Solutions Merged

1. Which of the following statements about carbon skeletons is true? - Ans-Carbon skeletons may take the shape of a ring. 2. Which component of an amino acid provides its acidic properties? - Ans-its carboxyl group 3. The __________ reaction that occurs when two monomers combine to form a polymer releases molecules of __________. - Ans-dehydration; water 4. Which of the following functional groups of organic molecules consists only of a carbon atom double-bonded to an oxygen atom? - Ans-Carbonyl 5. Glucose and fructose are isomers. What does this tell you about the two molecules? - Ans- they have the same molecular formula 6. What is the shape of a 6-carbon sugar molecule dissolved in an aqueous solution? - Ans-Ring 7. Why can't humans digest cellulose? - Ans-it contains hydrogen bonds 8. Saturated fats are semi-solid at room temperature, whereas unsaturated fats are usually liquid. Why? - Ans-single C-C bonds allow the molecules to "pack together" 9. The oil and vinegar in your salad dressing remain separate from one another due to the __________ properties of the oil. - Ans-hydrophobic 10. What do phospholipids and cholesterol have in common? - Ans-both are important components of cell membranes 11. Anabolic steroids are synthetic versions of the hormone __________. To which of the following persons can they be appropriately prescribed? - Ans-testosterone: people who suffer from muscle-destroying diseases 12. You wonder whether exercise affects weight in young men. Which of the following scenarios describes a controlled prospective experimental study to test your hypothesis? - Ans-groups of men aged 18-25 are assigned to run 1 mile every day or to remain sedentary, and weighed at regular intervals for 6 months. 13. In a study of factors that might contribute to heart disease, a relative risk of 1.75 for factor X indicates which of the following? - Ans-factor X is strongly associated with heart disease 14. Which component of a protein is primarily responsible for its shape? - Ans-the R groups in the chain