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Biochemistry
Introduction to Biochemistry
Water and Mineral Salts
Carbohydrates
Lipids
Proteins
Enzymes
Nucleic Acids
Cell Biology
Cell Organization
Membranes
Cytoskeleton and Cell Movement
Cellular Digestion and Secretion
Cell Nucleus
Cell Division
Photosynthesis
Cellular Respiration
Protein Synthesis
Microbiology
Bacteria
Protists
Fungi
Virus
Zoology
Introduction to Taxonomy
Poriferans
Cnidarians
Platyhelminthes
Nematodes
Annelids
Molluscs
Arthropods
Echinoderms
Chordates
Fishes
Amphibians
Reptiles
Birds
Mammals
Physiology
General Histology
Blood
Metabolism and Nutrition
Digestion
Respiration
Circulation
Excretion
Skin and Coverings
Musculoskeletal System
Nervous System
Vision
Hearing and Balance
Endocrine System
Immune System
Gametogenesis
Reproduction
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View chapter-related images
the sun photosynthesis phytoplankton food chain food web decomposers
trophic pyramids numeric pyramids biomass pyramids energy pyramids
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What is the primary energy source for life on earth?
The primary energy source for life on earth is the sun. The sun plays the important role of keeping the planet warmed and it is the source of the luminous energy used in photosynthesis. This energy is converted into organic material by the photosynthetic autotrophic beings and consumed by the other living beings.
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What is the main means by which autotrophic beings obtain energy?
The main means by which autotrophs obtain energy is photosynthesis. (There are also chemosynthetic autotrophs.)
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Which is the autotrophic group responsible for the production of most part of the molecular oxygen of earth?
Algae and cyanobacteria of the phytoplankton are the organisms that contribute most for the production of molecular oxygen.
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Embryology
General Embryology
Extraembryonic Membranes
Botany
Plant Classification and Life Cycles
Bryophytes
Pteridophytes
Gymnosperms
Angiosperms
Plant Tissues
Plant Physiology
Genetics
Fundamentals of Genetics
Mendel's Laws
Variations of Inheritance
Linkage and Crossing Over
Sex and Sex-Linked Inheritance
Blood Groups
Karyotype and Genetic Diseases
Genetic Distribution
Genetic Manipulation
Evolution
Hypothesis on the Origin of Life
Evolutionary Theory
Ecology
Notions on Ecology
Earth Biomes
Energy and Matter in Ecosystems
Biogeochemical Cycles
Biodiversity
Ecological Interactions
Ecological Succession
Populations
Environmental Problems
Diseases
Notions on Parasitism
Bacterial Infections
Protozoan Infections
Fungal Infections
Viral Infections
AIDS
Worm Infections
Prion Diseases
Degenerative Diseases
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