Biology ACP Top Exam Questions and answers, Verified. levels of organization (smallest to largest) - atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere Atoms - the smallest unit of matter

Biology ACP Top Exam Questions and answers, Verified. levels of organization (smallest to largest) - atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere Atoms - the smallest unit of matter molecules - made up of two or more atoms organelles - part of a cell that performs a specific function cells - the basic unit of life, made up of many organelles tissues - groups of cells that work together types of tissues - connective, muscle, nervous, epithelial Organ - a group of tissue that work together organ system - groups of organs that work together for a specific function organism - an individual living thing population - a group of one type of organism (one species) that live together Community - a group of several (different species ) populations living together. ecosystem - A community of organisms and their abiotic environment biosphere - all ecosystems on earth that are inhabited by life 3 biospheres - Lithosphere, hydrosphere and atmosphere endosymbiotic theory - theory that eukaryotic cells evolved from prokaryotic cells Why aren't viruses considered living? - they cannot reproduce without a host cell Bacteriophage - A virus that infects bacteria Virus structure - Genetic material: DNA or RNA, protein coat. and sometimes an envelope Two types of viral reproduction - lytic cycle and lysogenic cycle lyctic cycle - virus injects its viral DNA into a cell, uses cell's machinery to make copies of itself and then explodes open (lyses) into several viruses lysogenic cycle - a virus injects its viral DNA, the viral DNA becomes part of the cell so when the cell makes copies of itself it also makes copies of the virus Biomolecules - carbohydrates, lipids, proteins, nucleic acids nucleic acids - Stores an organisms genetic code. examples of nucleic acids - DNA and RNA nucleic acid monomer - nucleotide nucleic acid elements - CHONP Proteins - carry out functions and processes in the cell examples of proteins