Biology, Cells, Test
Current scientific methods can not conclusively distinguish
between all microorganisms
According to the Organismal Theory the
organism is the basic unit of life
hypertonic water flow
out of the cell
diffusion
the natural tendency of molecules to move from higher to lower concentration
the process of photosynthesis
6CO₂+C₆H₁₂O₆ ---(chlorophyll)--->C₆H₁₂O₆+6CO₂+6H₂O
some leukocytes absorb entire
bacteria by the process of phagocytosis
plasma membrane
controls what comes into and goes out of the cell
nucleolus
small structures within nucleus
cellular respiration
- CO₂ diffuses passively out of the cell - O₂ diffuses passively when converted to CO₂
why will external fluid flow into a plant cell?
- because the external water concentration is greater - because the external salt concentration is less
four organ systems which are operational in an amoeba
- respiration - digestion - reproduction - excretion
the simplest operational cell is still more complex than
a computer
organismal theory
a functioning organism represents life
the plasma membrane of a human cell
acts as a selective gatekeeper
cytoplasm
all cellular material outside the nucleus
epidermis
an outer covering of cells
organism
any functional plant or animal with interrelated parts
According to the Cell Theory, the
cell is the basic unit of life
nucleus
control center of the cell
cell theory
each cell possesses a life of its own
a leukocyte is responsible for
fighting disease by phagocytosis or antibody production
Ribosomal RNA
forms part of ribosomes, a cell's protein factories; formed in nucleolus
the taxonomic classification of all organisms
is not certain
characteristic that is unique to DNA
it contains coded information
vacuole
large storage structures
the relative concentration of water in a hypertonic solution is
low
cell wall
outer covering around plant cell made of fibrous material
organisms referred to as "colonial"
similar bacteria or protozoa which group together
Simple cell division of plants differs from
simple cell division of animals
Krebs cycle
takes place within the mitochondria; second stage of cellular respiration, in which pyruvic acid is broken down into carbon dioxide in a series of energy-extracting reactions
