Biology, Pages 82-91
Biology in clear, easy-to-read language
Biology is a comprehensive life science program for your reluctant readers and those who require additional help to grasp basic biological and life science concepts. This full-color, easy-to-read textbook addresses all these needs.
Written to meet national guidelines, students learn about classification and organization; patterns of reproduction, growth, and development; the human body's systems; ecological cycles; and other basic biological building blocks.
Lexile Level 840 Reading Level 3-4 Interest Level 6-12
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... base and the sugar ( Figure 5.26c ) . There are two families of nitrogenous
bases : pyrimidines and purines . A pyrimidine has a six - membered ring of
carbon and nitrogen atoms . ( The nitrogen atoms tend to take up H from solution
The only difference between these two sugars is that deoxyribose lacks an
oxygen atom on the second carbon in the ring ; hence its name . Because the
atoms in both the nitrogenous base and the sugar are numbered , the sugar
atoms have ...
Saturated fatty acids have the maximum number of hydrogen atoms .
Unsaturated fatty acids ( present in oils ) have one or more double bonds in their
hydrocarbon chains . Phospholipids Phospholipids , which are major
components of cell ...