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Class Date-=SkillsWorksheet

Directed .Reading

Section: The Chemistry of CellsComplete each statement by writing the correct term in the space provided.

1. The carbon atoms in large, complex b!omolecules 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 qf[lipids / protein].

Read each question, and write your answer' in the space provided.

11.What two factors determine the shape of a protein?

12.Wh~t roles do proteins play in organisms?

Original content Copyright @ by Holt, Rinehart and ,¥inston. Additions and changes to the original content are the responsibility of the instructor.

Holt Biology Chemistry of Life3

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Directed Reading continued

Class Date~

In the space provided, write the letter of the description that best matcheseach term.

13. nucleic acid

14. nucleotide

15.DNA

16. RNA

17.ATP

_18. phospholipid

19. amino acid

- 20. sugar

a. temporarily stores energy

b. involved in the production of proteins

c. subunit of proteins

d. one of tl;1emajor classes of organic compounds

e. contains the genetic code

f. subunit of carbohydrates

g. subunit of DNA and RNA

h. found in cell membranes

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Original content Copyright <tJby Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.

Chemistry pf Lif~4

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Skills Worksheetj:

~Directed Reading"

Section: Energy and MetabolismCompleteeach statementby underliningthe correctterm in the brackets.

1.A changein fonn or shapeof matter is a [physical/chemical] change'.'

2~The identity of matter changesin a [physical/chemical] change.

3. The law of conservation of energy states that every change in matter requires a""'"

change in [energy / mass].

In the space provided, write the letter,of the description that best matcheseach term.

4. energy a. ending materials in a chemical reaction

b. energy p.eede~to start a chemical reactionc. chemical bonds between atoms are broken a~d

newonesare fonned . '

d. alignmentof moleculesneededfor a reactiontoI

occur .

5. orientation

6. products

7. chemical reaction

8. activation energy

9. reactants

. e. the ability to move or change matter

f. substances that change in a reaction

In the space provided, ex"lain how the terms in each pair differ in meaning.

10.kinetic energy, activation energy "

11. reactants, products

. ",Qrl&lI,1~!con!ent Copyright <!;;Iby Holt; Rinehart and Winston, Additions and changes to the original content are the responsibility o,fthe instructor..

Holt Biology 5 . Chemistry of Lite

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. I Directed Re,ading continued

Class Date

,...."Read each question, and write your answer in the space provided.

12. What is an enzyme? I

13. How does an enzyme function?

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Complete each statement by writing the correct term or phrase in the spaceprovided.

14. A substance on which an enzyme acts is called a(n)

15. Most enzymes need certain conditions, such as and

, to work well....

~16.A(n) is the part of the

enzyme into which the substrate fits.

Read each question, and write your answer in the space provided.

17. Why is energy important to living things?

18. How does the energy in food become available to organisms?. . -

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Original content Copyright@by Holt, Rinehart and Winston. Additions ilnd changes to the original content are the responsibility of the instructor.

Holt Biology Chemistry of Life6..~.