Mitochondria and chloroplast are semiautonomous cell organelles which are formed by division of pre-existing organelles and contain DNA but they also contain protein synthesizing machinery, thus (a) is true and (b) is false.
Microtubules are long, hollow cylinders made up of polymerised alpha and beta tubulin dimers.
They are present in cilia and flagella for cellular movement, centrioles for chromosomal movement and spindle fibres for structural organization as well as chromosomal movement during nuclear division.
Thylakoids are flat membranous sacs in stroma.
Cristae are infoldings in mitochondria.
Cisternae are disc-shaped sacs in Golgi apparatus.
Chromatin is condensed structure of DNA.
Lysosomes, golgi apparatus and mitochondria are the cell organelles which have membranes.
A prokaryotic cell is characterised by absence of an organised nucleus and membrane bound cell organelles.
DNA is naked without a nuclear envelope.
Mesosomes, plasma membrane and 70S ribosomes are present in a prokaryotic cell.
Endoplasmic reticulum, nuclei, lysosomes, Golgi apparatus and mitochondria are membrane bound cell organelles whereas ribosomes are naked ribonucleoprotein protoplasmic particles.
In acrocentric chromosomes, centromere appears subterminal, with a very small and a very long arm.
In metacentric chromosome, centromere is median.
In submetacentric chromosome, centromere is submedian.
In telocentric chromosome, centromere is truly terminal.
Ribosomes are composed of ribonucleic acid and proteins and are not surrounded by any membrane.
These are the site for protein synthesis.
In late prophase, nuclear envelope disappears and reappears in late telophase from rough endoplasmic reticulum (RER).
Smooth endoplasmic reticulum (SER) is a system of smooth membranes within the cytoplasm.
It is the site of important metabolic reactions, including phospholipid and fatty acid synthesis.
