Question | Answer |
science is different from other subjects because it relies on testing what? | explanations |
the work of a scientist usually begins with what? | observations |
information gathered during observations or experiments is known as what? | data |
a scientific what can be tested by experiments or observations? | hypothesis |
a theory may be _______ or replaced | revised |
theories unify a broad range of observations and __________ | hypotheses |
what is a bias? | a personal preference; point of view |
what are the characteristics of all living things? | use energy, develop and grow over time, maintain themselves, reproduce and evolve |
what are the 3 particles that make up an atom? | protons, electrons, neutrons |
what is found in the space surrounding the nucleus of an atom? | electrons |
___________ particles are particles that are smaller than an atom | subatomic |
an atom's mass number is a combination on the number of __________ and ___________ the atom has | protons, electrons |
an atom's ________ _________ is the same as the number of protons the atom has | atomic number |
a __________ is a substance made by combining 2 or more elements | compound |
how many atoms of hydrogen and oxygen are in 1 molecule of water? | 2 hydrogen. 1 oxygen |
a _______ is a mixture in which the substances are evenly spread out | solution |
when salt is dissolved into water, water is the ________ and salt is the __________ | solvent; solute |
3 phases of matter | solid, liquid, gas |
liquid | substance that has a definite volume, but not a definite shape |
solid | substance that has a definite volume and definite shape |
gas | substance that has no definite shape or volume |
group/family | vertical columns on the periodic table |
period | horizontal rows on the periodic table |
element | material consisting of only 1 type of atom |
the cell nucleus stores | dna |
alleles | different forms of a gene |
physical property | property that describes physical characteristics of something |
chemical property | something that characterizes substances ability to react with other substances |
chemical change | reaction where something new is formed |
physical change | change in state or appearance; nothing new is formed |
what is the diffusion of water across a selectively permeable membrane? | osmosis |
the cell membrane functions to regulate the ________ of materials into and out of the cell | passage |
______________ requires energy to move molecules across the membrane | active transport |
the relatively constant internal physical conditions of an organism is known as what? | homeostasis |
what is the first phase of mitosis? | prophase |
gametes are produced by what process? | meiosis |
during the cell cycle, the chromosomes are only visible during | interphase |
sexual reproduction provides genetic __________ which is an advantage over asexual reproduction. | diversity |
one difference between cell division in plant and animal cells is that plant cells have a ____________ | cell plate |
mitosis results in the formation of __________ | diploid cells |
meiosis results in the formation of __________ | haploid cells |
at the end of meiosis, the result is ____ genetically ________ cells | 4; daughter |
mitosis happens during the _______ phase of the cell cycle | m |
dna is replicated during the ________ phase of the cell cycle | s |
what converts energy in a plant cell? | mitochondria |