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Name ______________________________ Class ___________________ Date __________________
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. Fats are lipids that store ______________________.
5. Amino acids are unique because of their _____________________.
Complete each statement by underlining the correct term in the brackets.
6. The carbohydrate that provides support in plants is [cellulose / chitin].
7. Lipids will dissolve in [water / oil].
8. Muscles, hooves, hair, and horns are made of [lipids / protein].
Read each question, and write your answer in the space provided.
9. What determines the shape of a protein?
_________________________________________________________________
_________________________________________________________________
10. What roles do proteins play in organisms?
_________________________________________________________________
_________________________________________________________________
In the space provided, write the letter of the description that best matches
each term.
_____ 11. nucleic acids
_____ 12. nucleotide
_____ 13. phospholipid
_____ 14. amino acid
a. subunit of proteins
b. contain the genetic code
c. subunit of carbohydrates
d. subunit of DNA and RNA
e. found in cell membranes
_____ 25. sugar (monosaccharide)
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