Internally a chloroplast contains a matrix or stroma which is similar to cytoplasm in its constitution.
It contains DNA, RNA, ribosomes, enzymes for CO 2 assimilation, proteins, starch grains and fat droplets.
Telomeres are non sticky terminal ends of the chromosomes. It has heterochromatin and repetitive DNA.
The thylakoid membranes possess the chlorophylls.
Totipotency is the ability of a living somatic plant cell to develop into a complete plant.
It was first demonstrated by Steward et. al. (1964) using phloem cells of carrot.
Nucleolus synthesizes and stores RNA.
The ribosomal proteins are synthesized in the cytoplasm and shift to the nucleolus for the formation of ribosomal subunits by complexing with rRNA.
Fluid mosaic model of plasma membrane proposes that plasma membrane comprises of a phospholipid bilayer wherein icebergs of proteins float in the sea of phospholipids.
Middle lamella is the first formed layer, present between the two adjacent cells.
It is made up of calcium and magnesium pectate.
Phytochrome is a plant pigment that can detect the presence or absence of light and is involved in regulating many processes that are linked to day length (photoperiod), such as seed germination and initiation of flowering.
A lysosome is a tiny sac bounded by a single unit membrane of lipoprotein.
It contains hydrolytic (digestive) enzymes called acid hydrolases.
Glycosylation of protein means linking of sugars to proteins which starts in rough endoplasmic reticulum and completed in golgi complex.
