The Key Concepts in Biology collection provides quick and easy access to high-quality high school biology resources. These resources have been selected by trusted educators to correlate with the BSCS Biology: A Human Approach Curriculum. This curriculum highlights nine key concepts in six units of study: Evolution, Homeostasis, Energy, Matter, and Organization, Reproduction and Inheritance in Living Systems, Growth Development, and Differentiation, and Ecology.
This two-day lesson helps students understand abiotic and biotic factors. Once the concept has been grasped, they can trace the interactions of these factors within a system.
This lesson describes how amino acids build proteins in a person's body. Amino acids are the chemical building blocks for the structure of an organism. A link to a quiz is provided at the end of the lesson to check comprehension.
Animals are faced with a constantly changing environment which they must adapt to. This lesson looks at gray whales and the specific adaptations these animals have made in order to develop crucial abilities such as keeping warm in icy water, seeing underwater and knowing when it's time to migrate. Students can click on four different areas: the whale's body, head, flippers and tail, and learn how each body part helps gray whales to thrive in their environment.
This presentation from Baylor College of Medicine's BioEd Online website provides a great introduction to the topic of homeostasis. Students will watch a presentation from Wade Haaland and view the accompanying slides. The entire program's running time is 36:19, and students may skip around the lecture by choosing from the slides on the right hand side of the page. In addition to covering the basics of homeostasis, this presentation goes into the necessary components of a homeostatic system, disruption of homeostasis and more. Flash is required to view the presentation.
This lesson helps students understand the notion of carrying capacity as it relates to ecosystems by considering an image of a bucket filled with water, and then filled with an "ecosystem." Students are asked to consider the factors on which carrying capacity is determined, and that a ecosystem's carrying capacity can change when certain variables are also changed.
This one-day activity challenges students to understand the ecological concept of carrying capacity through the physically-active process of role playing. Upon completion, students will be able to formulate and test hypotheses related to ecosystems and carrying capacity as well as describe the significance of carrying capacity.
In this video segment from The Secret of Life, a fertilized egg cell progresses from its earliest stages through cell differentiation and ultimately the development of an embryo, with simple but identifiable body parts including a spinal cord, a heart, and eyes. The video is accompanied by a background essay, discussion questions, and standards alignment.
This presentation from Bruce Coulter covers the basics of how cells contribute to the process of homeostasis. Sixteen slides are included and cover the transport of materials into and out of the cell, the process of homeostasis, what tissues are, plasma membranes, the fluid mosaic model, membrane proteins, cholesterol molecules, and passive and active transport. The slides also include a number of links to useful animations depicting these processes. A transcript is provided, and Flash is required to view the slides.
This 28 minute presentation provides basic information on DNA. The structure of DNA as well as the four bases are discussed in detail. The process of creating proteins is also explained.
This presentation from Hippocampus introduces the concept of biodiversity via a series of narrated animations. The material is broken down into five sections: Animal Fundamentals, Body Plans, Protostomes and Deuterostomes and a conclusion. Students will learn both how species are different from one another and the common bonds all living things share. Students may choose to skip between sections, or explore other related concepts on the biology portion of the Hippocampus site.
This diagram shows how energy from the sun cycles through plants and animals. Plants create sugars through photosynthesis which animals can then use for energy. ATP, glucose, and the mitochondria are also explained. Many key terms are hyperlinked to provide more detailed definitions.
This lesson explains how energy is used to keep the structure of an organism maintained. Otherwise, systems naturally progress from order to disorder according to the second law of thermodynamics. Key terms are hyperlinked to provide more detailed explanations.
What is evolution and how does it work? Evolution 101 provides the nuts-and-bolts on the patterns and mechanisms of evolution. You can explore the following sections: An Introduction to Evolution (evolution briefly defined and explained); The History of Life: looking at the patterns (how does evolution lead to the tree of life?); Mechanisms - The Processes of Evolution (how does evolution work?); Microevolution (how does evolution work on a small scale?); Speciation (what are species anyway, and how do new ones evolve?); Macroevolution (how does evolution work on a grand scale?); and The Big Issues (what are some of the big questions that evolutionary biologists are trying to answer?)
This activity from Darcy Hartley-Pinard will help elementary school teachers demonstrate the structures and process of the excretory system. The class will use a diagram of a human body and everyday items including straws, uncooked spaghetti, yarn and kidney beans to recreate the veins, arteries, kidneys, ureters, bladder and urethra. This activity is useful for younger students to visualize and connect with the processes that take place in their own bodies.
This video from the Teaching Channel demonstrates the concept of natural selection. The engaging classroom activity, led by instructor Ceri Evans, addresses survival and natural selection and relates these ideas to the larger concept of evolution. The video may be shown to students to demonstrate these concepts, or may be used as the basis for a similar classroom activity. Running time for the video is 27:29.
This lesson explains how energy travels through an ecosystem. This flow can be diagrammed in food chains and food webs as shown in the lesson's illustrations. Key terms are hyperlinked so students can easily view definitions of new concepts.
In this hands-on activity, learners track and record the passage of colored "pompom traits" through three generations of gingerbread people. In doing so, learners discover that traits are passed from parents to offspring and that siblings may or may not receive the same traits from their parents. This guide includes activity sheets in English and Spanish.
In this activity, learners build edible models of DNA, while learning basic DNA structure and the rules of base pairing. Learners construct the models out of licorice and colored marshmallows and create labels for the base pairs and backbone. This is an excellent activity to use at the end of a unit on DNA.
This webpage covers the basics of homeostasis and transport of substances across cell membranes. Students will learn the role cell membranes have in the process of homeostasis and how diffusion and osmosis work. Each subsection of the webpage includes educational graphics to accompany the text.
This lesson plan serves to introduce the concept of homeostasis in the human body to younger learners. The teacher will ask students to think about body functions such as fever and metabolism and consider the effects these functions have on the internal balance of the body. Three short in-class activities are outlined, including having the students explain how a body system helps to maintain homeostasis, researching a disease and explaining how the disease impacts the body and the effect it has on homeostasis, and drawing a diagram representing the process of homeostasis.