Completion
Complete each sentence or
statement.
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1.
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The
basic unit of structure in all living things is the ______.
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2.
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Cells, like all matter, are made of smaller particles called ____.
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3.
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______ are the building blocks of all matter.
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4.
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Two
or more atoms joined together form a ___________.
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5.
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A
substance made of only one type of atom is called an __________.
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6.
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__________ are pure substances that cannot be broken down chemically into simpler
kinds of matter.
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7.
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More
than ____ elements have been identified.
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8.
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Over
90 percent of the mass of living things is composed of only four elements. What are
they?
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9.
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Most
elements do not exist by themselves. Instead they __________ with other elements.
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10.
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A
pure substance that is made up of atoms of two or more elements is called a
___________.
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11.
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There
are four groups of organic, carbon-based compounds that are essential to the process that occur in
living things. Name these four compounds.
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12.
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The
subunits of proteins are called ________ __________.
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13.
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Aside
from water, ________ are the most abundant materials in cells.
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14.
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Cells
use ________________ as a source of energy.
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15.
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Sugars, starches, and cellulose are examples of _________________.
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16.
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Carbohydrates are made of ___________, ____________, and ______________.
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17.
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When
an organism needs energy, its cells break down ________________ to release the energy stored in
them.
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18.
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In
plants, the carbohydrate _______________ provides support.
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19.
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Lipids are made of __________, _________, and ____________.
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20.
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Some
lipids store ________ and others serve an important function in cell _____________.
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21.
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Nucleic acids are made up of carbon, hydrogen, oxygen, __________, and
____________.
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22.
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______ is an example of a nucleic acid. It contains information necessary to almost
all cell activities.
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23.
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_______ is another substance that is essential to the survival of a
cell.
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24.
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The
formula for water is _______
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25.
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Most
of a cell's volume is made up of _________.
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26.
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Why
is water such an important compound?
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27.
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A
substance consisting of carbon atoms bonded to oxygen atoms is a(n) _____________.
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28.
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____
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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