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Q5
Name two organelles that are present in all plant cells, but not
in all animal cells.
A
chloroplasts and vacuoles
Chloroplasts aid in photosynthesis and are actually never
present in animal cells. Vacuoles are large structures used for
the storage of waste, nutrients, or water. Some animal cells do
have vacuoles, but they are much smaller than the vacuoles
found in plant cells.
6
Q
What structure, which human cells lack, surrounds the outer
face of the plasma membrane in plant cells?
A
cell wall
,Plants have cell walls made of cellulose (a carbohydrate), fungi
have cell walls composed of chitin, and bacteria have cell walls
that consist of peptidoglycan. Humans do not have cell walls;
our cells are surrounded by the plasma membrane alone.
7
Q
In the net reaction of photosynthesis, which molecules are
reactants and which molecules are products?
A
Reactants:
Carbon dioxide
Water
Products:
Glucose
Oxygen
The purpose of photosynthesis is to make glucose (a
carbohydrate food source) to fuel the plant’s cells.
Technically, light is also a reactant, but light is not a molecule.
8
Q
What is the net reaction of photosynthesis?
A
, 6 CO2 + 6 H2O → C6H12O6 + 6 O2
Be sure to remember that C6H12O6 is the chemical formula for
glucose, the carbohydrate (sugar) produced by photosynthetic
plants.
9
Q
Name the waxy covering that protects plant leaves from water
loss.
A
cuticle
This structure is what you see when you look at the surface of a
leaf. Without the cuticle, plants would lose excess water via
evaporation.
11
Q
Are plant cells eukaryotic or prokaryotic?
A
Eukaryotic, like animal cells.
Even fungal cells are eukaryotic; only bacteria and Archaea are
prokaryotic.