Learn how apoptosis is different from cell death by injury. Learn the role of this process in development and body maintenance. [10:48]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to do the following:

Describe how cancer is caused by uncontrolled cell growth
Understand how proto-oncogenes are normal cell genes that, when mutated, become oncogenes
Describe how tumor suppressors function
Explain how mutant tumor suppressors cause cancer

By the end of this section, you will be able to do the following:

Describe the structure of prokaryotic and eukaryotic genomes
Distinguish between chromosomes, genes, and traits
Describe the mechanisms of chromosome compaction

By the end of this section, you will be able to do the following:

Understand how the cell cycle is controlled by mechanisms that are both internal and external to the cell
Explain how the three internal “control checkpoints” occur at the end of G1, at the G2/M transition, and during metaphase
Describe the molecules that control the cell cycle through positive and negative regulation

By the end of this section, you will be able to do the following:

Describe the process of binary fission in prokaryotes
Explain how FtsZ and tubulin proteins are examples of homology

By the end of this section, you will be able to do the following:

Describe the three stages of interphase
Discuss the behavior of chromosomes during karyokinesis/mitosis
Explain how the cytoplasmic content is divided during cytokinesis
Define the quiescent G0 phase

Paul Andersen details the first 7 of 13 labs in the AP Biology Curriculum. The following topics are all covered: Artificial Selection, Hardy-Weinberg Equilibrium, Comparing DNA using BLAST, Diffusion and Osmosis, Photosynthesis, Respiration, Mitosis and Meiosis. [13:26]

Learn the processes that happen in interphase to prepare the cell for division on this webpage. Webpage includes an audio lesson as well as an image. [0:23]

Understand the purpose of cell reproduction through mitosis and meiosis.

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Explore the different ways that animals and plants reproduce.

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The process of cell division in eukaryotic cells is carefully controlled. The cell cycle is the life cycle of a cell, with cell division at the end of the cycle. Like a human life cycle, which is made up of different phases, like childhood, adolescence, and adulthood, the cell cycle also occurs in a series of phases. Learn more about the cell cycle in this learning module produced by CK-12.

A free CK-12 account is required to view all materials.

Cells do eventually wear out. At that point, they need to be replaced. This is one reason that your cells divide. New cells that result after cells divide are also used for growth and to repair cuts. Learn more about cell division in this learning module produced by CK-12.

A free CK-12 account is required to view all materials.

Sexual reproduction combines gametes from two parents. Gametes are produced by a special type of cell division known as meiosis. Meiosis contains two rounds of cell division without DNA replication in between. This process reduces the number of chromosomes by half. Learn more about meiosis in this learning module produced by CK-12.

A free CK-12 account is required to view all materials.

In this video tutorial, you will learn how a zygote, the single cell produced by fertilization, divides by mitosis to produce all the tissues of the human body. [9:35]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.