and Answers 100% Pass
Independent Variable - ✔✔- what is being changed or tested during experiment; cause
Dependent Variable - ✔✔-what is being measured or observed during experiment;
effect
Control Variable - ✔✔-use as the comparison "group" in an experiment
What makes an experiment reliable? - ✔✔-has been tested numerous times by more
than one scientist
-it follows steps of scientific method
-no bias
-information came from third party
-study been retested
-results are published in scientific journal
Theory - ✔✔-are subject to revision and modification over time
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,Laws - ✔✔-developed when observations around the world are tested and retested
until there is a consensus in a scientific community; not changed over time
Dissection Light Microscope - ✔✔-lowest magnification for microscopes
-views organs and tissues during dissection
-views 3D specimens
Compound Light Microscope - ✔✔-40x to 400x
-views tissue samples, blood, microorganisms, and larger details of some cells
-common classroom microscope
Transmission Electron Microscope - ✔✔-passes a beam of electrons through a thin
specimen
-mainly used to study internal structures of cells that cannot be viewed under light
microscopes
Scanning Electron Microscope - ✔✔-electron beam passes over specimens surface that is
coated with thin layer of gold metal
-studies details of specimen's surface
-3D and black&white
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, Polar Molecules - ✔✔-have an end that is slightly positive and an end that is lightly
negative
-water
Hydrogen Bonding - ✔✔-attraction between the slightly positive hydrogen of one
molecule and the slightly negative oxygen of another water molecule
Surface tension - ✔✔elastic-like forces existing on the surface of a liquid caused by
asymmetry in the attractive forces between the liquid molecules
Cohesion - ✔✔when two like substances attract to one another
Adhesion - ✔✔when two unlike substances attract
universal solvent - ✔✔water can dissolve into many substances: ionic compounds and
polar molecules dissolve easily in water
water____ when it freezes - ✔✔expands
frozen water is ____ dense - ✔✔less
high specific heat - ✔✔can absorb a lot of energy before changing temperature
nucleic acids - ✔✔-made of nucleotides
-codes to make protein
-ex: DNA and RNA
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