BIOLOGY [1 Mark Question Answer]

Chloroplast is a green pigment which helps in photosynthesis whereas leucoplast is colourless which helps in storage of proteins and starch.

Cytoplasm is all the contents inside the cell membrane excluding the nucleus. And protoplasm includes cytoplasm, plus, the nucleus of the cell.

The endoplasmic reticulum (ER) is a large, dynamic structure that serves many roles in the cell including calcium storage, protein synthesis and lipid metabolism. The diverse functions of the ER are performed by distinct domains; consisting of tubules, sheets and the nuclear envelope.

The centrosome is the primary microtubule-organizing centre (MTOC) in animal cells, and so it regulates cell motility, adhesion and polarity in interphase, and facilitates the organization of the spindle poles during mitosis

as a factory in which proteins received from the ER are further processed and sorted for transport to their eventual destinations: lysosomes, the plasma membrane, or secretion. In addition, as noted earlier, glycolipids and sphingomyelin are synthesized within the Golgi.

Popularly known as the "Powerhouse of the cell," mitochondria (singular: mitochondrion) are a double membrane-bound organelle found in most eukaryotic organisms.

Ribosomes can be found floating within the cytoplasm or attached to the endoplasmic reticulum. Their main function is to convert genetic code into an amino acid sequence and to build protein polymers from amino acid monomers.

The cells having a well-organized nucleus with a nuclear membrane are termed as eukaryotic cells. The organisms with these kinds of cells are called eukaryotes.

Prokaryotic cells are unicellular organisms without a nuclear membrane. Certain cell organelles like mictochondria, lysosomes are absent in prokaryotes

Organelles are special and organized structures seen in living cells. Some of the membrane-bound organelles are vacuoles, nucleus, chloroplasts, lysosomes etc

the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body.

smooth muscle fibre and Paramoecium

Guard cells

irregular shaped cell include Amoeba

The largest cells is an egg cell of ostrich

The longest cell of the body is the neuron

Mycoplasma (PPLO-Pleuro pneumonia like organims)