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process by which cells use energy to transport molecules through the cell memebrane from areas of low concentration to areas of high concentration
any trait that helps an organism survive and reproduce under a given set of environmental conditions
condition in which a person's immune system is overly sensitive to environmental substances that are normally harmless
protein, produced by the immune system that either attacks invading pathogens or marks them for killing
molecule found on the outer surfaces of cells that the immune system recognizes as either part of the body or an outside invader
method of reproduction in which all the genes passed on to the offspring come from a single parent
substance that can speed up the rate of chemical reaction w/out being changed or used up during the reaction
process in which nutrients are broke apart, releasing the chemical energy stores in them
combination of all the different populations that live and interact in the same environment
jellylike substance that is between the cell membrane and the nucleus and that contains specialized structures
process where dead organisms are broke down into their raw materials and returned to the ecosystem
process that breaks down large food molecules into simpler molecules that the organism can sue
organelle that transports proteins and other materials from one part of a cell to another
part of the female reproductive system where the egg cell is fertilized by the sperm cell
cycle in which the output of a system either modifies or reinforces the first action taken by the system
specialized cells that control the opening and closing of the pores on the surface of a leaf
ability of an organism to maintain a stable internal environment even when the external environment changes
hormone that prompts glucose to move from the blood into body cells resulting in a lower glucose level in the blood
process that divides the cell's nucleus into 2 each with a complete set of genetic material from the parent cell
particle in which 2 or more atoms combine to from a single unit
smallest unit of a compound
body system comprised of tissue that contracts with it is stimulated
combination of muscles that enables the body to move
process by which individuals that are better suited to their environment survive and reproduce most successfully; also called survival of the fittest
movement of nitrogen from the atmosphere to the soil and organisms and then back to the atmosphere
large structure w/in a cell that controls the cell's metabolism and stores genetic info including DNA
large, complex organic molecules that contain the instructions cells need to carry out their life processes
substance that provides the body with the materials and energy need to carry out the basic life of cells
process by which plants and some other organisms use light energy to convert water and carbon dioxide into oxygen and high-energy carbohydrates such as sugars and starches
the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus
complex multicellular organism that obtains energy through photosynthesis and consists of cell walls and specialized tissues and organs
additional mixing of genetic material from a sperm and egg which results in an unique combo of genes
process of choosing a few organisms with desirable traits to serve as the parents of the next generation
method that involves 2 parents to produce offspring that are genetically different from either parent
body system that contains the bones, provides shape and support and protects internal organs
group of organism taht share certain characteristics and can mate with one another producing fertile offspring
process where plants absorb water through their roots and eliminate it through tiny pore on the undersides of their leaves
storage sac w/in the cytoplasm of a cell that may contain either wastes or useful materials such as water or food
nonliving particle of protein and genetic material that reproduces by invading the cell of a living organism
process by which water continuously moves from Earth's surface to the atmosphere and back
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