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Cells Part 1



Completion
Complete each sentence or statement.
 

1. 

The basic unit of structure in all living things is the ______.     
 

 

2. 

Cells, like all matter, are made of smaller particles called ____.
 

 

3. 

______ are the building blocks of all matter.
 

 

4. 

Two or more atoms joined together form a ___________.
 

 

5. 

A substance made of only one type of atom is called an __________.
 

 

6. 

__________ are pure substances that cannot be broken down chemically into simpler kinds of matter.
 

 

7. 

More than ____ elements have been identified.
 

 

8. 

Over 90 percent of the mass of living things is composed of only four elements. What are they?
 

 

9. 

Most elements do not exist by themselves. Instead they __________ with other elements.
 

 

10. 

A pure substance that is made up of atoms of two or more elements is called a ___________.
 

 

11. 

There are four groups of organic, carbon-based compounds that are essential to the process that occur in living things. Name these four compounds.
 

 

12. 

The subunits of proteins are called ________    __________.
 

 

13. 

Aside from water, ________ are the most abundant materials in cells.
 

 

14. 

Cells use ________________ as a source of energy.
 

 

15. 

Sugars, starches, and cellulose are examples of _________________.
 

 

16. 

Carbohydrates are made of ___________, ____________, and ______________.
 

 

17. 

When an organism needs energy, its cells break down ________________ to release the energy stored in them.
 

 

18. 

In plants, the carbohydrate _______________ provides support.
 

 

19. 

Lipids are made of __________, _________, and ____________.
 

 

20. 

Some lipids store ________ and others serve an important function in cell _____________.
 

 

21. 

Nucleic acids are made up of carbon, hydrogen, oxygen, __________, and ____________.
 

 

22. 

______ is an example of a nucleic acid. It contains information necessary to almost all cell activities.
 

 

23. 

_______ is another substance that is essential to the survival of a cell.
 

 

24. 

The formula for water is _______
 

 

25. 

Most of a cell's volume is made up of _________.
 

 

26. 

Why is water such an important compound?
 

 

27. 

A substance consisting of carbon atoms bonded to oxygen atoms is a(n) _____________.
 

 

28. 

____ is the compound within living things that stores energy and when broken down provides all living things with the energy they require.
 

 



 
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