TExES Life Science 7-12 238 Question
and answers verified to pass
mass - correct answers measurement of the amount of matter something
contains
weight - correct answers measurement of the pull of gravity an object contains
chromatography - correct answers set of techniques used to separate
substances based on their different properties such as size or charge
centrifugation - correct answers used to separate blood into blood cells, with
heavier blood cells settling to the bottom
electrophoresis - correct answers uses electrical charges of molecules to
separate them according to their size
polymerase chain reaction (PCR) - correct answers technique in which a
piece of DNA can be amplified into billions of copies within a few hours
hypothesis - correct answers unproved theory or educated guess followed by
research to best explain phenomena
theory - correct answers a proven hypothesis
independent variable - correct answers variable which the researcher can
manipulate or change. example: pH levels, temperature, nutrients, light, etc
, dependent variable - correct answers factor that changes due to independent
variable ex: browning of apples after oxidation
covalent bonding - correct answers sharing of valence electrons by 2 atoms
example: H2, O3
nonpolar covalent bonds - correct answers electrons are shared equally,
usually happens with 2 elements that are identical.
polar covalent bonds - correct answers electrons are shared between 2
different atoms
electronegativity - correct answers attraction for the electrons of a covalent
bond
hydrogen bond - correct answers when one electronegative atom shared a
negative charge with a hydrogen
ionic bond - correct answers when one electron is completely stripped away
from its atom to join another atom
monomers - correct answers simple unit of structures
polymers - correct answers made up of multiple monomers
carbohydrates - correct answers examples: starch, gylcogen, cellulose, chitin
lipids - correct answers examples: cholesterol, steroids, trans fats
and answers verified to pass
mass - correct answers measurement of the amount of matter something
contains
weight - correct answers measurement of the pull of gravity an object contains
chromatography - correct answers set of techniques used to separate
substances based on their different properties such as size or charge
centrifugation - correct answers used to separate blood into blood cells, with
heavier blood cells settling to the bottom
electrophoresis - correct answers uses electrical charges of molecules to
separate them according to their size
polymerase chain reaction (PCR) - correct answers technique in which a
piece of DNA can be amplified into billions of copies within a few hours
hypothesis - correct answers unproved theory or educated guess followed by
research to best explain phenomena
theory - correct answers a proven hypothesis
independent variable - correct answers variable which the researcher can
manipulate or change. example: pH levels, temperature, nutrients, light, etc
, dependent variable - correct answers factor that changes due to independent
variable ex: browning of apples after oxidation
covalent bonding - correct answers sharing of valence electrons by 2 atoms
example: H2, O3
nonpolar covalent bonds - correct answers electrons are shared equally,
usually happens with 2 elements that are identical.
polar covalent bonds - correct answers electrons are shared between 2
different atoms
electronegativity - correct answers attraction for the electrons of a covalent
bond
hydrogen bond - correct answers when one electronegative atom shared a
negative charge with a hydrogen
ionic bond - correct answers when one electron is completely stripped away
from its atom to join another atom
monomers - correct answers simple unit of structures
polymers - correct answers made up of multiple monomers
carbohydrates - correct answers examples: starch, gylcogen, cellulose, chitin
lipids - correct answers examples: cholesterol, steroids, trans fats
