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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For instance , the substitution of one amino acid ( valine ) for the normal one (
glutamic acid ) at a particular position in the primary structure of hemoglobin , the
protein that carries oxygen in red blood cells , can cause sickle - cell disease , an
Normal red blood cells are disk - shaped , but in sickle - cell disease , the
abnormal hemoglobin molecules tend to crystallize , deforming some of the cells
into a sickle shape ( Figure 5.21 ) . The life of someone with the disease is
The molecular hardware of the cell — the tools for most biological functions—
consists of proteins . For example , the oxygen carrier in the blood is the protein
hemoglobin , not the DNA that specifies its structure . How does RNA , the other