bio test 11/10

what is spontaneous generation

life could arise from nonliving matter

what did Redi propose

flies laid eggs on meat which produced maggots

what did redi’s experiment consist of

an covered and uncovered jar of gravy

how did needham test redis experiment

by heating the bottles with the gravy in them

what didr needham say about redis experiment

spontaneous generation could occur under certain conditions

what was spallanzanis experiment

boiled 2 containers of gravy; one opened & one unopened

what did pasteurs experiment show

all living things come from living things

what is the first characteristic of life

all living things are made up of cells

what are cells

the smallest unit of organism that can be considered

what is the 2nd characteristic of life

living things reproduce

what are the 2 different types of reproduction

sexual & asexual

what is asexual reproduction

when a single parent produces offspring that are identical

what is sexual reproduction

cells come from 2 different parents

what is the 3rd characteristic of life

living things are based on a universal genetic code

what do organisms do

store the information they need to live, grow, and reproduce

what is the 4th characteristic of life

living things grow and develop

what happens during an organisms development

cells differentiate which means the cells look different from each other

what is the 5th characteristic of life

living things obtain & use materials & energy

what is metabolism

chemical reactions through which an organism builds up or breaks down materials

what is the 6th characteristic of life

living things respond to their environment

what is a stimulus

signal to which an organism responds

what is the 7th characteristic of life

living things maintain a stable internal environment

what is the process in which an organism maintains a stable internal environment called?

homeostasis

what is the 8th characteristic of life

living things change over time

what are the levels of organization?

molecules, cells, tissues, organs, systems, organisms, population, community, ecosystem, biome, biosphere

what is an organism

any living thing

what is a population

group of organisms of one type that live in the same area

what is a community

populations that live together in a defined area

what is a ecosystem

a community & its nonliving surroundings

what is a biome

a group of ecosystems that share similar climates & types of organisms

what is a biosphere

part of earth that contains life

why was a neck used when testing the 2 flasks

air could get into the flask but microorganisms couldn’t

what are field studies

observing animals without disturbing them

what do all living things share

the 8 characteristics of life

what are the 2 different lab techniques

cell culture & cell fractionation

what is cell culture

group of cells on agar formed from a single cell

what is cell fractionation

process used to separate different cell parts