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Life Sc1st Sem Final
vocabulary words
| Question | Answer |
|---|---|
| life science | the study of living things |
| scientific method | a series of steps followed to solve problems |
| hypothesis | an explanation that is based on prior scientific research or observations and that can be tested |
| theory | an explanation that ties together many hypotheses and observations |
| technology | application of science for practical purposes; the use of tools, machines, etc to meet human needs |
| cell | the smallest unit that can perform all life processes |
| sexual reproduction | reproduction in which the sex cells from 2 parents unite producing offspring that share traits from both parents |
| asexual reproduction | reproduction that does not involve the union ol sex cells and in which one parent produces offspring identical to itself |
| heredity | the passing of genetic traits from parent to offspring |
| producer | organism that can make its own food by using energy from its surroundings |
| consumer | organism that eats other organisms or organic matter |
| decomposer | organism that gets energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients |
| ATP | adenosine triphosphate, a molecule that acts as the main energy source for cell processes |
| nucleus | in eukaryotic cell; membrane bound organelle that contains cell's DNA and has a role in processes such as growth, metabolism, and reproduction |
| organelle | one of the small bodies in a cell's cytoplasm that are specialized to perform a specific function |
| prokaryote | an organism that consists of a single cell that does not have a nucleus |
| eukaryote | organism made up of cells that have a nucleus enclosed by a membrane; include animals, plants and fungi but not archaebacteria of eubacteria |
| organism | anything that can perform life processes by itself |
| structure | the arrangement of parts in an organism |
| dominant trait | trait that is observed in the first generation of offspring |
| recessive trait | trait that reappears in the second generation |
| gene | one set of instructions for an inherited trait |
| allele | different forms of a gene |
| meiosis | process in cell division during which the number of chromosomes decreases to half the original number by 2 divisions of the nucleus - results in the production of sex cells |
| sex chromosome | determines the sex of individuals |
| adaptation | a characteristic that improves an individuals ability to survive and reproduce in a particular environment |
| evolution | the process in which inherited characteristics within a population change over generations such that new species sometimes arise |
| trait | a genetically determined characteristic |
| natural selection | the process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals do |
Created by:
msparks
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