Biology 101 Exam 1 Questions And Answers (Verified And Updated)

Biology 101 Exam 1 Questions And Answers (Verified And Updated) Biology - answerThe scientific study of life Ecosystem - answerAll the organisms living in a particular area Community - answerEntire array of organisms in a ecosystem Population - answerAll individuals of a particular species living in an area Organism - answerindividual living thing Organ system - answerseveral organs that cooperate in a specific function Organ - answerMade up of several different tissues made up of a group of similar cells that perform a specific function Cell - answerFundamental unit of life Organelle - answerMembrane enclosed structure that performs a specific function within the cell Molecule - answerCluster of small chemical units called atoms held together by chemical bonds Prokaryotic Cells - answerSmall Simple unicellular No organelle system No nucleus cell walls made of sugar Eukaryotic Cells - answerLarge complex unicellular & multicellular have nucleus may have cell walls Producers - answerOrganisms in eco- system that can make their own food Consumers - answerEat plants and other animals Decomposers - answerTake matter and breaks down protein and distributes it back into Earth Four most common elements in living organisms - answerOxygen(O) Hydrogen(H) Nitrogen(N) Carbon(C) Atoms - answerSmallest units of matter Matter - answerAnything that occupies space and has mass Element - answerA substance that cannot be broken down to other substances by ordinary chemical means Compound - answerSubstance consisting of two or more different elements combined in a fixed ratio Percentage of elements used by organisms - answer96.3% Percentage of trace elements of human body weight - answer0.01% Proton - answerSubatomic particle with a single positive electrical charge (+) Electron - answerSubatomic particle with a single negative charge (-) Neutron - answerIs electrically neutral (no charge) Atomic number - answerAtoms of a particular element have the same number of protons Covalent Bonds - answerStrongest bonds; Electrons are shared between two atoms Electronegativity - answerAn atom's attraction for shared electrons Nonpolar covalent bonds - answerMolecules of one element, two identical atoms exert an equal pull on electrons Polar covalent bonds - answerunequal sharing of electrons Ionic bonds - answerElectrons transferred from one atom to another Hydrogen bonds - answerTwo polar covalent being attracted to other polar covalent bonds