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7th grde finale

study guide

QuestionAnswer
what is a scientific theory? is an explanation on how things or events based on scientific knowledge
what is a scientific law? a statement about how things work in nature that seems to be true all the time
what are the steps od the scientific method? state the problem, gather information, form a hypotheiesis, conduct an expirement, analze data, conclusion
what is variable? something in an expirement that can change
what is a constant? something in an expirement that stays the same
state the cell theory? all organisms are made up of one or more cells the cell is the basic unit of organization in organisms all cells come from cells
who delveloped the cell theory? robert hooke, matthias scheidlers, rudolf vicrow
what is a vaccine? prevents diseases
what is respiration? chemical reacations that occur that breakdown food molecules into simpler substances and releases their stored energy
what photosynthesis? plants and many other producers can covert light energy into another kind of energy
what is a dichotomous key? a detailed list of identifying characteristics that inculde scientific names
what is a eukaryotic cell? cell membrane with bonds structures
what is a prokaryotic cell? cell membrane without bond structures
how do materials get into and out of a cell? through atice and passive transport.
what is active transport? when an input of energy is required to move materials through a cell membrane
what is passive transport? the movement of substances through the cell membrane without the input of energy.
what is endocytosis? the cell process that takes in a substance by surrounding it with the cell membrane
what is excytosis? contents of a vesicle can be released by a cell
what is seletively permeable? only certen things can pass
what is fermintation? when cells do not have enough oxygen for respiration, they use this process
what is a molecule? a group of atoms held together by energy of chemical bonds
what makes up a chromosome? a threadlike line or strand of dna and associated proteins in the nucleus of eukaryotic cells that carries genes.
how many chromosomes does a body cell have? 46
how many chromosomes does a sex cell have? 23
what is an example of asexual reproduction strawberries and a potato
what is the purpose of mitosis? it forms 2 body cells
what is the purpose of meiosis? it forms 4 sex cells
what is a chyme? food is arranged in the stomach into a thin watery liquid
what is perstalsis waves of muscle contractions
what are some respatory diseases chronic bronchitis and emphysema
what is dialysis if both of a person kidneys failed and had to go onto machine
what is excretory system any system that gets rid of waste
Created by: jjazzster
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