Which of the following is not the function of plasma membrane?
DNA synthesis
The plasma membrane is a lipid bilayer with embedded proteins (fluid mosaic model). Its fluid nature is important for many cellular functions.
According to NCERT, the fluidity of the plasma membrane is important for cell growth, formation of intercellular junctions, secretion, endocytosis and cell division. It also controls the transport of molecules across the cell.
DNA synthesis (replication) takes place in the nucleus (and in DNA-containing organelles such as mitochondria and chloroplasts), using DNA polymerase on a DNA template. It is not a function of the plasma membrane. Endocytosis, secretion and the formation of intercellular junctions are all membrane-dependent processes.
DNA synthesis option is correct.
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Important Questions from Cell : Structure and Functions
A student was asked to identify a permanent slide of mitosis. He made the following observations.
(i) Splitting of centromere and formation of daughter chromatids.
(ii) Chromatids are migrating towards the opposite poles.
The stage would be
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A diploid cell which has 8 chromosomes undergoes meiosis and produces 4 daughter cells. What is the number of chromosomes present in each daughter cell formed at the end of meiosis-I?
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a) The active site of the enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate and the new enzyme product complex is formed.
b) The substrate binds tightly to the enzyme, inducing a change in the active site of the enzyme.
c) The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate.
d) The substrate binds to the active site of the enzyme.
A chromosome with an extremely short and a very long arm is called ________.
