INTRO LIFE SCIE QUIZ Flashcards
Possible explanations that attempt
different possibilities on how life could
have begun:
I. The Concept of Life
the hypothesis explains that life originated on another planet outside our Solar System. Life was then carried to Earth on a meteorite or an asteroid and colonized earth. However, this hypothesis has not been proven.
- Extraterrestrial origin
the theory that presumes that the “seed” of life exists all over the universe and can be propagated through space, and that life on Earth originated from those seeds.
- Panspermia
many people believe that life was put
on Earth by Divine forces. Creation
theories are common to many of the
world’s religions and cultures
- Divine Creation
Scientists believe that life arose on
Earth from inanimate matter.
- Origin from nonliving matter
Early Theories on the Origin of Life
Early Theories on the Origin of Life
spontaneous generation theory • states that living things were naturally created from nonliving things, such as simple organic compounds • it was supported by the Miller-Urey Experiment
- THEORY OF ABIOGENESIS
states that living things came from living
things
• experiments of Francesco Redi and Louis
Pasteur disproved the thought of
spontaneous generation during their time
. THEORY OF BIOGENESIS
He was the first person to challenge the
theory of spontaneous generation by
demonstrating that maggots come from eggs
of flies (1668)
FRANCESCO REDI
A French scientist who proved that micro
organisms was carried by dust not air (1864)
LOUIS PASTEUR
supported by French scientists Georges Cuvier and Orbigny • states that there have been several living creations from God, wherein each encountered a catastrophe which completely destroyed them.
THEORY OF CATASTROPHISM
all organisms possess a genetic system that is based on the replication and duplication of DNA • the transmission of characteristics from parent to offspring is called heredity
HEREDITY
he Cell Theory
Three tenets:
- All living things are composed of one
or more cells. - The Cell is the basic unit of life.
- All cells arise from pre-existing cells
ll living things use energy to grow • to get the energy needed, plants or plant-eating animals are consumed. • The sum of all chemical processes that maintain the living state of an organism is called metabolism.
METABOLISM
all living things maintain stable internal conditions • while the environment varies a lot, organisms act to keep their internal conditions relatively constant in the process called homeostasis
HOMEOSTASIS
is the smallest and
most fundamental unit of
matter
Atom –
grouping /
bonding of atoms
. Molecules
the basic unit of
structure and function of
life
Cell
refers to a group
of cells which perform the
same function
Tissue
refers to one or more types of tissues that are organized as a unit to perform certain functions of the body
- Organ
composed of different organs which coordinate with one another to perform a common function
Organ System
the basic living
system, that possess all the
characteristics of the species
to which it belongs
- Organism –
– consists of all
members of one species in a
particular area
- Population
interspecific
grouping of interacting population
Community
