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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading Section: The Chemistry of Cells Complete each statement by writing the correct term in the space provided. 1. The carbon atoms in large, complex biomolecules are bonded to other atoms with ____________________ bonds. 2. The four major classes of organic compounds are _____________________, ______________________, ______________________, and nucleic acids. 3. The building blocks of carbohydrates are _____________________. 4. If a carbohydrate molecule contained six carbon atoms, it would also contain ______________________ hydrogen atoms. 5. Fats are lipids that store ______________________. 6. Amino acids link together in a protein with _____________________ bonds. Complete each statement by underlining the correct term in the brackets. 7. The carbohydrate that provides support in plants is [cellulose / chitin]. 8. Lipids will dissolve in [water / oil]. 9. The coils and folds of a protein’s amino acid chain make up the protein’s [primary / secondary] structure. 10. Muscles, hooves, hair, and horns are made of [lipids / protein]. Read each question, and write your answer in the space provided. 11. What two factors determine the shape of a protein? _________________________________________________________________ _________________________________________________________________ 12. What roles do proteins play in organisms? _________________________________________________________________ _________________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 3 Chemistry of Life Name ______________________________ Class ___________________ Date __________________ Directed Reading continued In the space provided, write the letter of the description that best matches each term. _____ 13. nucleic acid _____ 14. nucleotide _____ 15. DNA _____ 16. RNA _____ 17. ATP _____ 18. phospholipid a. temporarily stores energy b. involved in the production of proteins c. subunit of proteins d. one of the major classes of organic compounds e. contains the genetic code f. subunit of carbohydrates g. subunit of DNA and RNA h. found in cell membranes _____ 19. amino acid _____ 20. sugar Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Biology 4 Chemistry of Life