Download Summary: Activity 3

Summary: Activity 3
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The material in the chromosomes of plants and animals that controls the
heredity of the organism is called ____________. The DNA molecule is a
twisted structure which, when untwisted, resembles a _______________.
The sides of the DNA molecule are long threads or strands that are made up
of ____________ groups and _____________ groups. In any one strand
the ____________groups alternate with the ____________groups. The
sugar groups are connected to the phosphate groups in any one strand by
______________ bonds.
The rungs of the ladder join a ___________ group on one strand with a
__________ group on the other strand. The rungs do not connect the
__________ groups of the two strands. The rungs of the ladder are made
of four bases. They are designed by the letters ___,___,___, and ____.
The four combine in only two ways. A and ___ always go together, and G and
___ always go together. Each pair, A-T and G-C, represents a _________
of the genetic code. The arrangement of the pairs of bases along a DNA
molecule forms a _______ of the genetic code. If the arrangement of the
words differ from one arrangement, then the words are _____________.
Organisms that are identical in their heredity, such as identical twins, are
assumed to have (identical/different) ___________ arrangements of the
pairs of bases in their DNA molecules. Organisms that are different in their
heredity are assumed to have a different genetic ____________.
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