Which structures perform the function of mitochondria in bacteria? 
The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as: 
So, the correct answer is 'Microfilaments'.
The osmotic expansion of a cell kept in water is chiefly regulated by: 
The vacuole is bound by a single membrane called tonoplast. It also functions as semipermeable membrane. It segregates vacuolar contents from cytoplasm, allows osmotic entry or exit of water, concentration and storage of nutrients as well as wastes.
Match the following and select the correct answer: 
► Centriole: There are two main functions of centrioles
1. Cell division :The main function of the centriole is to help with cell division in animal cells. The centrioles help in the formation of the spindle fibers that separate the chromosomes during cell division (mitosis).
2. Celiogenesis :The second function of centrioles that we will focus on is celiogenesis. Celiogenesis is simply the formation of cilia and flagella on the surface of cells. Cilia and flagella help the cell move.
► Chlorophyll molecules are arranged in and around photosystems that are embedded in the thylakoid membranes of chloroplasts.
► A crista is a fold in the inner membrane of a mitochondrion.
► Ribosomes comprise a complex macromolecular machine, found within all living cells, that serves as the site of biological protein synthesis (translation). Ribosomes link amino acids together in the order specified by messenger RNA(mRNA) molecules.
DNA is not present in : [2015 RS]
Ribosomes are composed of ribonucleic acid and proteins and are not surrounded by any membrane. These are site for protein synthesis.
Nuclear envelope is a derivative of : [2015 RS]
Which one of the following is not an inclusion body found in prokaryotes ?
Select the correct matching in the following pairs: [2015 RS]
Which of the following are not membrane bound? [2015 RS]
Ribosomes are the protein factory of a cell. These are non-membranous organelle which attaches on endoplasmic reticulum by transcolon.
The function of the gap junction is to [2015 RS]
The function of the gap junction is to facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
The term cell was given by
In a 1665 publication called Micrographia, experimental scientist Robert Hooke coined the term “cell” for the box-like structures he observed when viewing cork tissue through a lens.
A protoplast is a cell : [2015 RS]
Protoplasts are cells with the plasma membrane, cytoplasm and nucleus which have their cell wall removed by the action of enzymes. Cellulase enzymes digest the cellulose in plant cell walls while Pectinase enzymes break down the pectin holding cells together. Once the cell wall has been removed , the resulting protoplast is spherical in shape.
Which of the following statements is true for a secretory cell?
RER is frequently observed in the cells actively involved in protein synthesis and secretion. RER is well developed in cells engaged in synthesis of secretory products.
Match the columns and identify the correct option.
(a) → (iii),
(b) → (iv),
(c) → (i),
(d) → (ii).
Cellular organelles with membranes are : [2015 RS]
Satellite DNA is important because it : [2015 RS]
Cell wall is absent in : [2015 RS]
The cell wall is the hard protective covering of all plant, fungal and some bacterial cells. Mycoplasma is a genus of bacteria that lack a cell wall and surrounded by their cell membrane only.
Mitochondria and chloroplast are 
(a) Semi-autonomous organelles
(b) Formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery
Which one of the following options is correct ?
Mitochondria & chloroplast are semiautonomous cell organelle which are formed by division of pre-existing organelle & contain DNA but they also contain proteinsynthesizing machinery, thus (a) is true & (b) is false.
Microtubules are the constituents of: 
So, the correct answer is 'Spindle fibers, centrioles, and cilia'.
Which one of the following cell organelles is enclosed by a single membrane ?
Lysosome is enclosed by a single membrane while Mitochondria, Chloroplasts and Nuclei are enclosed by double membrane.