Cell BasicsLiving VS. Non-LivingComplex organisms, such as humans, require many systems for their life processes. Less complex living things may lack the complex systems of more complex organisms, but they still carry on the basic life activities. While …

Immune System and DiseaseVocabulary: immune response, pathogens, immunity, immune system, antigen, pathogen, white blood cells, antibodies, memory, allergies, auto-immune disease, AIDS, Human Genome ProjectDisease Homeostasis in an organism is constantl…

PhotosynthesisBiochemical ProcessesAlmost all life on Earth ultimately depends upon the Sun for its energy. The process of photosynthesis converts the Sun’s energy to sugars which living things may use as an energy source. These sugars are converted to a…

Cell DivisionAsexual ReproductionSpecies are maintained in existence through the life spans process of reproduction. Asexual reproduction produces genetically identical offspring from a single parent cell. The process of mitosis is associated with asexua…

Moving Air Provides A LiftMoving air can provide a lift. A simple experiment will help us explain lift. Take a strip of paper and blow on top of it (Fig.) What happens?The paper is pushed up. To understand this, let us look at the forces acting on the s…

DNA/RNAVocabulary: genes, DNA, replication, mutation, gamete, heredity, complementary base pairing, chromosomes, asexual, mitosis, crossing over, genetic recombination, natural selection, cancer, adenine, guanine, cytosine, thymine, template, RNA, mRNA, …

Cell TransportCell MembraneThe cell membrane or plasma membrane performs a number of important functions for the cell. These functions include the separation of the cell from its outside environment, controlling which molecules enter and leave the cell, …

What Is Deficiency Diseases‎Lack of carbohydrates, proteins, vitamins, or minerals in the diet can cause diseases. Diseases that are caused due to the lack of nutrients in the diet are called deficiency diseases. Deficiency diseases cannot be transmitted…

Intro to GeneticsSexual Reproduction ProcessThe process of sexual reproduction involves two parents. Both parents normally contribute one gamete or sex cell to the process. This process assures that the genetic information given to the offspring will be…

Cell RespirationRespirationIn all organisms, organic compounds such as glucose can be used to make other molecules. These molecules include proteins, DNA, starch, and fats. The chemical energy stored in bonds can be used as a source of energy for life p…