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plant cells
1. A Plant Cell is any type of cell that
comes from an organism belonging
to the Kingdom Plantae.
2. Plant cells are eukaryotic cells, or cells with a
membrane-bound nucleus. Unlike prokaryotic
cells the DNA in a plant cell is housed within
the nucleus. In addition to having a nucleus,
plant cells also contain other membrane-
bound organelles, or tiny cellular structures,
that carry out specific functions necessary for
normal cellular operation. Organelles have a
wide range of responsibilities that include
everything from producing hormones and
enzymes to providing energy for a plant cell.
10. Endoplasmic Reticulum (ER) - extensive network of
membranes composed of both regions with ribosomes
(rough ER) and regions without ribosomes (smooth
ER).
11. Nucleus - membrane bound structure that contains the
cell's hereditary information.
13. Ribosomes - consisting of RNA and proteins, ribosomes
are responsible for protein assembly.
14. Vacuole - structure in a plant cell that provides support
and participates in a variety of cellular functions
including storage, detoxification, protection, and
growth. When a plant cell matures, it typically contains
one large liquid-filled vacuole.
16. As a plant matures, its cells become
specialized in order to perform certain
functions necessary for survival. Some
plant cells synthesize and store organic
products, while others help to transport
nutrients throughout the plant. Some
examples of specialized plant cell
types include:
17. Parenchyma Cells - although not highly
specialized, these cells synthesize and store organic
products in the plant.
Collenchyma Cells - help to support plants while not
restraining growth due to their lack of secondary walls
and the absence of a hardening agent in their primary
walls.
Sclerenchyma Cells - provide a support function in
plants, but unlike collenchyma cells, they have a
hardening agent and are much more rigid.
18. Water Conducting Cells-Water conducting cells of
xylem also have a support function in plants but unlike
collenchyma cells, they have a hardening agent and are
much more rigid.
Sieve Tube Members-Sieve tube members of phloem
conduct organic nutrients such as sugar throughout the
plant.
19. Phloem, like xylem is a complex tissue. There
are actually two types of conducting elements in
phloem, however sieve tube members provide
this function in the majority of angiosperms.
Unlike the tracheary elements in the
xylem, phloem must be living in order to
function.
The xylem is a complex tissue. There are two
types of sclerenhyma conducting cells in the
xylem, the tracheids and vessel elements. The
term tracheary element is sometimes used to refer
to these cell types.