Themes in the Study of Life Chapter 1&2 – Flashcards
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Order
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1. living things are highly organized in structure and function 2. analyzing biological structure gives us clues about what it does and how it works 3. structure and function are related at all levels
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Reproduction
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1. Organisms produce their own kind 2. Life on earth uses the nucleic acid and code for Heritable information - DNA
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Growth
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increase in size
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Development
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increase in complexity
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Growth and Development
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Organisms increase in size and complexity Life grows by internal changes
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Energy Utilization
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1. organisms take in energy and transform it to do work. 2. organisms are "open" systems, they must continually take in energy
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Response to the Environment
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1. organism respond to changes or stimuli in their environment 2. the speed of the response may be fast or slow
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Fast response to stimuli in the environment
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venus fly trap
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Homeostasis
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organism maintain their internal environment within tolerable limits
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Homeo
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Same
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Stasis
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State
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Evolutionary Adaptation
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1. Species not organisms change over time as they adapt to their environment 2. organisms must adapt, move or die!
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Biology can be described as the study of the science of ____________.
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Life
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After making careful observations, scientists construct a __________. which is a suggested explanation that accounts for those observations
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hypothesis
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the experimental testing of a hypothesis formulated after the systematic objective collection of data us called the __. method
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scientific
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From th time of the Greek Fratosthenes to the present day, scientists have been using the method of ___ reasoning in which general principles are applied to the analysis of specific cases
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deductive
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a hypothesis is tested by a(n) ___
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experiment
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a(n) ___. is a hypothesis that is supported by a great deal of evidence
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theory
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Experiments are carried out to test the hypothesis by changing one variable at a time and including a(n) _______ condition in which the variable is unaltered
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controlled
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specimens or rock strata which show progressive changes in characteristics of earlier organisms are called ____.
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fossils
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Darwin concluded from his voyage that the process of ___ had been responsible for the patterns of distribution and relationships of organisms
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evolution
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Natural ___ explains how the traits of organisms that leave more offspring become more common in succeeding generations
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selection
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Science is not based on
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observations
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in science when general principles are arrived at from the examination of specific hypothesis (cases) it is called
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inductive reasoning
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What is not true about a hypothesis?
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it always withstands the test of experiments
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hypotheses that are consistent with the results of experimental testing are
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conditionally accepted
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The scientific process involves
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rejection of hypotheses that are inconsistent with experimental results
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A valid experiment must include
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a variable that is altered in specific way/a control in which the variable is left unaltered/both control and the variable, which are treated in parallel/only one variable to be tested
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The theory that provides a conceptual framework that unifies biology as a science is
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the theory of evolution
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the naturalist on the ship HMS beagle was
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Darwin
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The proposal that one type of organism can change gradually into another type over a long period of time is known as
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evolution
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What was not one of the beliefs of Darwin's time?
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Operation of natural laws produces constant change and improvement
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Darwin studied the giant tortoises
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on the Galapagos Islands
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Darwin's thinking about evolution was influenced by observations made on all of the following except
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leaves falling from gingko trees
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Besides Darwin the theory of evolution by means of natural selection was also independently proposed by
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Alfred Wallace
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Darwin described which of the following as "those individuals that possess superior physical, behavioral, or other attributes are more likely to survive than those that are not so well endowed." and thus are more likely to pass their traits to the next generation?
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geometric progression
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a key contribution to Darwin's thinking was the concept of limits put on the geometric growth of populations by nature, originally proposed by
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Thomas Malthus
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Recent discoveries of microscopic fossils have extended the known history of life to about
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3.5 billion years ago
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modern pieces of evidence that corroborate Darwin's theory of evolution include all of the following except
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human population growth
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a critical requirement of Darwin's theory is
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genetic variation is possible in nature
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the same basic array of bones are modified to give rise to the wing of a bat and the fin of a porpoise. such anatomical structures are called
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homologous
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structures that have similar structure and function but different evolutionary origins are called
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homologous
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somewhat more than 100 years ago scientists discovered the fossil remains of a 150 million-year old bird known as
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Archaeopteryx
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Which of the following is not required for evolution to take place
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artificial breeding
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Gingko trees may lose their leaves in response to decreasing day length
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hypothesis
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Plants adapt to seasonal changes in their surroundings
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theory
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Plants are raised under artificial lights turned off and on by an electric clock. some are given long periods of light, other short periods.
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experiment
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walnut trees may respond to the advancing season in the same way that gingko trees do.
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deductive reasoning
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gingko trees are known to lose their leaves at a certain time each year throughout the united states. they must behave the same way in china.
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inductive reasoning
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the negatively charged particles with almost no mass, orbit around the nuclear core of the atom. these are named
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electrons
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the number of protons in a given atom is equal to its ___ number
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atomic
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____ of an element have atoms with the same atomic numbers but different number of neutrons
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isotopes
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In chemical reactions, the gain of an electron is called ___
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reduction
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when atoms gain or lose electrons, they become negatively or positively charged. they then are attracted to each other by ___
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ionic bonds
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a(n) ________ bond forms when two atoms share a pair of electrons
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non-polar covalent
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approximately 90% of the atoms of all organisms are oxygen and hydrogen, reflecting the predominant role of ___ in living systems
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water
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water molecules are polar with ends that exhibit partial positive and negative charges. such opposite charges make water molecules attract each other through weak bonds called __
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hydrogen bonds
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the __ of water molecules determines its chemistry and thus the chemistry of life
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hydrogen
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___ is defined as the negative logarithm of the hydrogen ion concentration in the solution
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pH scale
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a substance that acts as a reservoir for H+ ions, opposing any increase or decrease in concentration, is a(n)
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buffer
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a proton
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has one positive charge, has one dalton of mass, and is found in the nucleus of the atom
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an electron
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has one negative charge, has one 1/1840 dalton of mass, is found in the nucleus called the orbital
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the atomic number of an element is equal to the number of ___
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protons only
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ordinary oxygen has an atomic mass of 16 and an atomic number of 8, this means that the number of neutrons in this type of oxygen is
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8
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atoms tend to be neutral in nature. therefore in such atoms the number of protons must be equal to the number of
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electrons
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oxygen ordinarily has 8 protons and 8 neutrons. another rare form has two extra neutrons. these two forms are
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oxygen isotopes
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atoms in which the number of electrons does not equal the number of protons are known as
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ions
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the chemical behavior of atoms is determined by
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its electrons
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in the crystal matrix of ordinary salt, the sodium and chlorine are held together by
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ionic bonds
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four most abundant atoms found in living things
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carbon, hydrogen, nitrogen, oxygen
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because oxygen is more electronegative than hydrogen, the water molecule is
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polar
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water molecules are attracted to eachother because of the opposite charges created by partial charge separations within the molecules. these attractions are called
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hydrogen bonds
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nonpolar molecules tend to aggregate in water because they are forced to come into close proximity with each other due to
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hydrophobic interactions
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when water ionizes, it produces equal amounts of hydrogen and hydroxide ions, which can reassociate with eachother water is thus
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a base and an acid
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compared with a pH of 7, a solution of pH 5 has
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100 times the hydrogen concentration
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