Cell structure definitions (Grana (stacks of thylakoids in chloroplasts.),…
Cell structure definitions
unicellular microorganisms which lack membrane-bound organelles and an organised nucleus.
Cellulose cell wall
made of cellulose and absent from animal cells. Can prevent plants cells from bursting when turgid; provided support; maintains cell's shape.
cells having a true nucleus,
network of proteins within the cytoplasm. They give support to the cell, forms tracks for motor proteins, form spindle fibres and make up cilia and undulipodia.
consists of two bundles of microtubules at right angles to each other. Forms spindle fibres for cell division; also involved with the formation of cilia and undulipodia.
Present on spermatozoa, enabling them to move. Contain microtubules and formed from centrioles.
small, spherical organelle, without a membrane. Made of ribosomal RNA in the nucleous. Some are free in the cytoplasm; others attach to the RER. Involved in protein synthesis
present on nearly all cells in the body, acting as antennae and allowing the cells to detect signals in their immediate environment. Epithelial cells lining the airways have many cilia that beat to move mucus. Contain microtubules and formed from centrioles.
small vesicles formed from the Golgi. Contain hydrolytic enzymes to digest pathogens.
membrane surrounding the vacuole in plant cells.
folded inner membrane of mitochondria.
fluid-filled matrix in chloroplasts.
stacks of thylakoids in chloroplasts.
flatenned membrane sacs containing chlorophyll, in chloroplasts.
site of photosynthesis. They are surrounded by a double membrane; the inner membrane is continuous with thylakoids.
site of ATP production during aerobic respiration. They are surrounded by two membrane; the inner membrane is folded into cristae.
stacks on membrane-bound flattened sacs. Proteins are modified here, adding sugars or lipids and folding them into their 3D structure.
dense region in the nucleus, where ribosomes are made. It contains RNA and does not have a membrane surrounding it.
double membrane surrounding the nucleus.
uncondensed DNA wound around histone proteins.
Smooth endoplasmic reticulum
system of membranes, containing cisternae that are continuous with the nuclear membrane, but is not coated with ribosomes. It is involved with lipid absorption, synthesis and transport.
fluid-filled cavities in the RER and SER.
Rough endoplasmic reticulum
system of membranes, containing cisternae that are continuous with the nuclear membrane. It is coated with ribosomes where amino acids are assembled into proteins.
is the control centre of the cell; stores genetic information; transmits genetic information; provides instructions for protein synthesis.