During DNA replication in prokaryotes, DNA is anchored to
the cell membrane
the nuclear membrane
the nucleolus
the histone proteins
Related Questions
Select the incorrect statement about plasma membrane
It is selectively permeable.
It is composed of a phospholipid bilayer.
It contains cholesterol in animal cells.
It is a static structure.
The fluidity of membranes in a plant in cold weather may be maintained by
Increasing the number of phospholipids with unsaturated hydrocarbon tails
Increasing the proportion of integral proteins
Increasing concentration of cholesterol in membrane
Increasing the number of phospholipids with saturated hydrocarbon tail
Plasma membrane helps in
Transportation of only water in and out of cell
Protein synthesis
Osmoregulation
Nucleic acid synthesis
Lipid rafts are specialized microdomains within the cell membrane. Which of the following statements about their composition and function is INCORRECT?
They are enriched in cholesterol and sphingolipids.
They are involved in signal transduction and membrane trafficking.
They exhibit reduced fluidity compared to the surrounding membrane.
They are primarily composed of unsaturated phospholipids and peripheral membrane proteins.
Which of the following is characteristic of phospholipids of plasma membrane?
One non-polar head and two polar tails
One polar head and two non-polar tails
Two non-polar heads and one polar tail
Two polar heads and one non-polar tail
Lipid bilayer is present in
Plasma membrane
Ribosome
Chromosome
Nucleolus
The thickness of unit membrane is
20Å
35Å
55Å
75Å
In fluid mosaic model of plasma membrane
Upper layer is non-polar and hydrophilic
Polar layer is hydrophobic
Phospholipids form a bimolecular layer in middle part
Proteins from a middle layer
According to widely accepted ‘fluid mosaic model’ cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statement is incorrect?
Proteins in cell membranes can travel within the lipid bilayer
Proteins can remain confined within certain domains of the membrane
Proteins can also undergo flip-flip movements in the lipid bilayer
Many proteins remain completely embedded within the lipid bilayer
During endocytosis, the cell
Divides its cytoplasm during mitosis
Digests itself
Engulfs and internalises materials using its membrane
Enables the extracellular digestion of large molecules
