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NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERS
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NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERS
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NAS2 CHALLENGE EXAM QUESTIONS AND ANSWERSPurpose of Scientific Method - Answers -solve a problem or answer a question
Question, Hypothesis, Experiment, Observe & Record, Analyze, Conclude - Answers -
steps of scientific method
Independent variable - Answers -a variable that stands alone and isn't changed by the
other variables you are trying to measure, change or controlled
example: age
dependent variable - Answers -a variable dependent on other factors, tested or
measured
example: test score - factors that go into a score you receive on a test
control group - Answers -does not receive treatment and used to compare or measure
the other subjects
experimental group - Answers -exposed to changes in independent variable
anatomy - Answers -branch of science concerned with bodily structure of living
organisms; structure
physiology - Answers -science dealing with the functions of living things or their organs
level of organization - Answers -living things arranged from the simplest to most
complex are:
organelle
cells
tissues
organs
organ systems, organism
populations communities
ecosystem
biosphere
requirements for life - Answers -Cellular organization
Reproduction
Metabolism
Homeostasis
Heredity
Response to stimuli
Growth and development
Adaptation through evolution
, survival needs - Answers -Food, oxygen, water, body temperature, atmospheric
pressure (oxygen/carbon dioxide exchange)
electron - Answers -negatively charged particle, outer shell
proton - Answers -positive, in nucleus
number of protons - Answers -number of electrons is equal to the same...
number of protons - Answers -atomic number is equal to...
atomic mass - Answers -sum of protons and neutrons in the nucleus
the weighted average mass of isotopes of an element, found below the element symbol
ionic bond - Answers -chemical bond formed between two ions that are opposite
charges, atom gives up one or more electrons to another atom
covalent bond - Answers -sharing electron pairs between atoms
polar covalent bond - Answers -pair of electrons unequally shared between two atoms
nonpolar covalent bond - Answers -two atoms share a pair of electrons with each other
hydrogen bond - Answers -weak bond result of attraction between proton and
electronegative atom of another
enzymes - Answers -catalyze chemical reactions by lowering activation energy barriers
and converting substrate molecules to products
substrate - Answers -reactant acted upon by an enzyme
enzymes active site binds to this
active site - Answers -part of an enzyme to which substrates bind and where a reaction
is catalyzed
enzymes - Answers -promote chemical reactions by bringing substrates together in an
optimal orientation, thus creating an ideal chemical environment for the reaction to
occur
always return to original state
decomposition - Answers -single compound breaks down into two or more elements or
new compounds
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