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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