Offering to the GodsThe marble penis and scrotum depicted in Figure (PageIndex 1 ) comes from ancient Rome, during the period from about 200 BCE to 400 CE. During that time, offerings like this were commonly given to the gods by people with health problems, either in the hopes of a cure or as thanks for receiving one.
Sunlight represents the external energy source without which ecosystems cannot sustain themselves. The transformation (conversion) of light energy to chemical energy, which is the only mode of energy that can be used by cells in all components of an ecosystem, whether they are producers, consumers or decomposers, is done through a process called photosynthesis.
The science that studies life is biology. She studies living things: the animals, the vegetables, the human body. Not everything that moves is alive. For example, a robot, a mobile, and a car move but are not alive. A tree and a carrot do not move, but they are living beings. Rabbit and fish are living things, but the mountain is not.
It is a bilateral association between different species, in which both benefit; However, such an association is not obligatory, and each species can live in isolation. The actions of birds that promote the dispersal of plants by eating their fruits and evacuating their seeds in a distant place, as well as the action of insects that seek flower nectar and involuntarily contribute to the pollination of plants are considered examples of protocooperation.
Biochemistry Energy Metabolism Glucose and Metabolism Energy in the form of ATP Fermentation Alcoholic Fermentation Lactic Fermentation Aerobic Fermentation Glycolysis Cystic Acid or Krebs Cycle Respiratory Chain Photosynthesis Chloroplasts Light and Photosynthesis Photosynthetic Pigments Light Phase Photosynthesis Phases Calvin Limiting Factors Photosynthesis Photosynthesis and Electronics Photosynthesis and Medicine Chemiosynthesis Ecology Ecological Concepts Biosphere Characteristics of Ecosystems Biotic Factors Food Chains Food Webs Energy Flow in Ecosystems Ecological Pyramids Ecosystem Productivity Ecological Efficiency Terrestrial Biomes Brazilian Populations Community Dynamics Ecological Succession Fire and Ecological Succession Biogeochemical Cycles Plant Morphology The Root Types of Roots Stem Types of Caus les Leaf Leaf structures Leaf abscission Leaf classification Flower Floral diagrams Fruit formation Flower fertilization Fruit classification Fruit parts Seeds Fruit and seed dissemination The Vegetable Cell Plant Tissues Epidermis Attachments Tissue Organization in the Roots and Stems Meristem The Plant Hormones Photoperiodism and Cytochromes Plant Movements Plant Nutrition Did not find the content you were looking for?
The plants perform photosynthesis by removing carbon from the environment of CO2 for formatting organic matter. The latter is oxidized by the cellular respiration process, which results in the release of CO2 into the environment. The decomposition and burning of fossil fuels (coal and oil) also releases CO 2 into the environment.
Plastids or plastids are a group of plant cell specific organelles, which have characteristics similar to mitochondria such as double membrane, own DNA and endosymbion origin. Plastids develop from proplastids, which are small organelles present in the immature cells of plant meristems and develop according to the needs of the cell. (without pigment), etioplasts (which develop in the absence of light), amyloplasts (which accumulate starch as a reserve substance), proteoplasts (which store protein), and oleoplasts (accumulate lipids).
Vertebrates Animals that have a spine are called vertebrates. They are divided into 5 groups. Check below which are: Birds - They are covered with feathers. They have paws and wings. Mammals - Your skin is covered with hair. The female feeds the cubs with milk from their breasts. Fish - Your skin is covered with scales.
Nitrogen is shown to be one of the fundamental elements in the composition of living systems. He is involved with the coordination and control of metabolic activities. However, although 78% of the atmosphere is made up of nitrogen, the vast majority of organisms are unable to use it because it is in the gaseous (N 2) form which is very stable and has little tendency to react with other elements.
Animals that do not have a spine are invertebrates. Insects - They have 6 legs. Arachnids - They have 8 paws. Crustaceans - They have several legs and often have claws. Centipedes - They have many paws: they can reach a hundred! Mollusks - They have a soft body, with or without shell.
The term "pigment" means colored substance. The color of the photosynthesizing pigment depends on the ranges of the visible light spectrum that it absorbs or reflects. Chlorophyll, which gives the green color characteristic of most vegetables, absorbs light very well in the red and violet bands, reflecting green light.
From the 1970s, it was easier to analyze the DNA molecule with restriction enzyme isolation. These enzymes are endonucleases, that is, inside (hence the endo - inside) prefix of DNA molecules, cutting them into well-defined locations. These enzymes are normally produced by bacteria and have the property of defending them from invading viruses.
An air-filled bladder has more mass than an empty bladder. Why? Because there is more air. Air has mass and occupies space. But in the case of the bladder, the mass difference is very small and can only be measured on very sensitive scales. The mass difference is small because the air density is relatively small - much smaller, for example, than the water density.
Chemistry The Atomic Structure of Matter Atomic Models The Interior of the Atom Electric Charges and Masses The Atom Nucleus Atom Representation Atomic Similarities Electrosphere and Energy Levels Ions The Periodic Table The Current Periodic Table Periods and Families Metals, Nonmetals, and Semimetals Noble Gases Chemical Bonds Ionic Bond Covalent Bond Metallic Bond Matter and its Properties General Matter Properties Specific Matter Properties Physical Matter States Chemical Substances Simple and Compound Substances Pure Substances and Mixtures Solution and Solubility Separation of Mixtures Metal Alloys Chemical Functions Acid Function Base Function ( The acid-base and pH indicators Salt function Oxide function Chemical reaction Reagent and products Law of conservation of mass Law of constant proportions Chemical equations Classification of chemical reactions s chemical reactions The speed of chemical reactions Didn't find the content you were looking for?
Adult individuals There are stem cells in various tissues (such as bone marrow, blood, liver) in children and adults. However, the amount is small and we do not know yet which tissues are able to differentiate. Recent research has shown that stem cells taken from the marrow of individuals with heart problems have been able to replenish their heart muscle, which opens up fantastic prospects for treatment for people with heart problems.
Some cell types have the ability to quickly change the consistency of their cytosol, generating internal flows that allow the cell to change shape and move. This type of cell movement, present in many protozoa and some cell types of multicellular animals, is called amoeboid movement.
The ability of a membrane to be crossed by some substances and not others defines its permeability. In one solution are the solvent (dispersing liquid medium) and the solute (dissolved particle). The membranes are classified according to permeability into 4 types: a) Permeable: allows the passage of solvent and solute; b) Waterproof: does not allow the passage of solvent or solute; c) Semipermeable: allows the passage of the solvent, but not the solute; d) Selectively permeable: allows the passage of solvent and some types of solute.
Translation is the name used to designate the protein synthesis process. It occurs in the cytoplasm with the participation, among others, of RNA and amino acids. Who participates in protein synthesis? Cistron (gene) is the segment of DNA that contains the information for the synthesis of a polypeptide or protein.
Peroxisomes are membranous sacs that contain some types of digestive enzymes. Their resemblance to lysosomes caused them to be confused with them until very recently. However, today it is known that peroxisomes differ from lysosomes mainly in the type of enzymes they have. Peroxisomes, in addition to containing enzymes that break down fats and amino acids, also contain large amounts of the catalase enzyme.
In some cells, certain proteins are produced in large quantities. For example, the observation of glands secreting certain hormones of a protein nature (which are released into the blood to act on other organs of the same organism) shows, in certain places, a row of ribosomes reading the same messenger RNA.
RNA synthesis (messenger, for example) begins with the separation of the two strands of DNA. Only one strand of DNA serves as a template for the production of the mRNA molecule. The other tape is not transcribed. This is one of the differences between DNA duplication and RNA production. The other differences are: the nucleotides used have ribose sugar in place of deoxyribose; there is the participation of uracil nucleotides in place of thymine nucleotides.