Pearson, as an active contributor to the biology learning community, is pleased to provide free access to the Classic edition of The Biology Place to all educators and their students.
The purpose of the activities is to help you review material you have already studied in class or have read in your text. Some of the material will extend your knowledge beyond your classwork or textbook reading. At the end of each activity, you can assess your progress through a Self-Quiz.
To begin, click on an activity title.
Lab 2 Enzyme Catalysis
Mitosis and Meiosis
Plant Pigments and Photosynthesis
6-I Bacterial Transformation
6-II DNA Electrophoresis
Genetics of Organisms
Population Genetics and Evolution
10-I Cardiovascular Fitness
10-II Heart Rate in Daphnia
Biomembranes I: Membrane Structure and Transport
Biomembranes II: Membrane Dynamics and Communication
Cardiovascular System I: The Beating Heart
Cardiovascular System II: The Vascular Highway
Cell Structure and Function
DNA Structure and Replication
From Gene to Protein: Transcription
From Gene to Protein: Translation (Protein Synthesis)
Plant Structure and Growth
Properties of Biomolecules
Restriction Enzyme Digestion of DNA
The lac Operon in E. coli
Concept 6: Nucleic Acids
Nucleic acids, built by polymerizing nucleotides, function primarily as informational molecules for the storage and retrieval of information about the primary sequence of polypeptides.
There are two types of nucleic acids:
- Deoxyribonucleic acid (DNA), which serves as a cellular database by storing an immense amount of information about all the polypeptides a cell can potentially make.
- Ribonucleic acid (RNA), which occurs in several different forms (messenger RNA, ribosomal RNA, transfer RNA) and is needed to convert DNA information into polypeptide sequences; in some viruses, RNA serves as the primary database with no DNA involvement; certain RNAs have catalytic ability similar to that of protein enzymes called ribozymes
Nucleic acids are built from subunits called nucleotides. Each nucleotide has three components:
- a ring-shaped molecule belonging to the class of purine or pyrimidine bases
- a 5-carbon, or pentose, sugar
- one or more phosphate groups