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Biology Section 1 (COMPLETED) (A (characteristics of living organisms…
Biology Section 1 (COMPLETED)
A
characteristics of living organisms
require nutrition
respire
excrete their waste
respond to their surroundings
movement
control internal conditions
reproduce
grow and develop
B
Variety of living organisms
plants
multicelluar
cells contain chloroplast
Photosynthesise
cellulose cell walls
store carbohydrates as:
starch
glucose
Animals
multicellualar
cells dont contain chloroplast
dont photosynthesise
no cell walls
usually have a nervous system and co-ordination
often store carbohydrates as sucrose
Fungi
don't photosynthesise
body usually organised into mycellium
made of thread like structures called Hyphae
which contain multiple nuclei
some are single celled
Chitin cell walls
feed by extracellular secretion of digestive enzymes
absorbtion of food materials
satrophic nutrition
they may store carbohydrate as glycogen
Bacteria
microscopic, single celled
cell wall and cell membrane
cytoplasm and plasmids
no nucleus, but a circular chromosone of dna
some can carry out photosynthesis
but most feed off dead organisms
Protocists
microscopic, single celled
some have animal cell features, some have plant cell elements
Viruses
small particles, smaller than bacteria
parasitic, can only reproduce in other living cells
not actually living
infect every type of living organisms
come in a variety of shapes and sizes
no cellular structure
protein coat
contain 1 strand of RNA or DNA