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29 Cards in this Set
- Front
- Back
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life arose on earth approcimately how many years ago
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3.8 billion
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______ the differnces among prganisms that allow for life in such a wide variety of eniveroments on earth
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adaptations
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which of the following is not a charateric of most living organisms
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none of the above
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photosynthesis was a major evlutionary milestone because
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all of the above
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the fact that all cells come from preexisting cells is part of ______ theory
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cell
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a group of cells that work together to carry out a similar function is known as
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tissue
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which of the follwoing are necessary for speciation to occur
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reproductive isolation of two groups of organisms
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which of the following is not a domain in the tree of life
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plantae
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the information needed to produce proteins is contained in
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genes
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ecology is the study if how
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speices interact with each other and the environment
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in an example experiment, reaschers subjected frogs to various levels of UV-B radiation while keeping all other variables constant. This is an example of a ______ experiment
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controlled
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for a hypothesis to be scientifically valid, it must be ________ and it must be possible to ______ it
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testible, reject
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eukaroytic cells differ from prokaroytic cells in the fact that they have
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organelles
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organisms are named using thier ___ and then their _____
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genius, species
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the atomic number of an element refers to the number of _____ in an atom
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protons
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whic of hte flowing statements concerning electronss is NOT true
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the outer shell of all atoms must contain eight electrons
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the element with which of the following atomic numbers would be stable
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18
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how can you differentiate between an element and a molecule
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molecules may be composed of different types of atoms, whereas elements are always composed of only one type of atom
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the strongest chemial bonds occure when
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two atoms share electrons in a covalent bond
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you have discovered that a molecule is hydrophilic. what else do you know about this milecule
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both a and c
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the stability of the 3-dimensional shape of many large molecules is dependent on
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hydrogen bonds
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the molecular weight of gluose is 180. if you added 180 grams of glucose to a .5 liter of water, what would be the molarity of the resulting solution
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2
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why does ice flaot in water
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ice is less dense than water
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cola has a pH of 3; blood plasma has of pH of 7. The hydorgen ion concentration of cola is ____ than the hydrogen ion concentation of blood plamsa
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10,000 times greater
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if solution A has a pH of 2 and solution B has a pH of 8, which of the following statements is true
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A is acidic and B is acidic
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one mole of glucose wieighs
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180 grams
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the role of a buffer is to
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maintain pH homostasis
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which of the following statemtnts about water is correct
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water has a high specific heat
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what occurs in a chemial raection
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the bonding partners of atoms changes during the reaction
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