Which of the following is the primary component of the cell membrane?
Carbohydrates
Proteins
Nucleic acids
Phospholipids
Related Questions
Which type of molecule can easily pass through the cell membrane without assistance?
Large, polar molecules
Ions
Small, nonpolar molecules
Proteins
Select the incorrect statement about plasma membrane
It is selectively permeable.
It is composed of a phospholipid bilayer.
It contains proteins.
It is primarily composed of carbohydrates.
Plasma membrane helps in
Transportation of only water in and out of cell
Protein synthesis
Osmoregulation
Nucleic acid synthesis
The fluidity of the cell membrane is influenced by several factors. Which of the following would DECREASE membrane fluidity?
Increased proportion of unsaturated fatty acids
Shorter fatty acid chain length
Increased cholesterol content at high temperatures
Decreased cholesterol content at low temperatures
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.
A researcher is studying the transport of a novel molecule across a synthetic lipid bilayer. They observe that the molecule moves down its concentration gradient without the need for any membrane proteins or energy input. However, the rate of transport is significantly slower than predicted for simple diffusion. Which of the following BEST explains this observation?
The molecule is very large and its size restricts diffusion through the membrane.
The molecule is charged and is repelled by the hydrophobic core of the bilayer.
The molecule is polar and its passage is hindered by the hydrophobic core of the bilayer.
The molecule is binding to a specific receptor on the membrane surface, slowing its diffusion.
During DNA replication in prokaryotes, DNA is anchored to
the cell membrane
the nuclear membrane
the nucleolus
free-floating ribosomes
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
RNA is not found in
Chromosome
Plasmalemma
Nucleolus
Ribosome
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
