What is related to the complexity of cell membrane function?

The type and number of proteins.

The functional characteristics are:1It can separate and form cells and organelles, provide a relatively stable internal environment for the life activities of cells, and the area of the membrane is greatly increased, which improves the biological functions that occur on the membrane.

2.Barrier effect: water-soluble substances on both sides of the membrane cannot pass freely.

3.Selective transport of matter, accompanied by the transfer of energy. 4.

Biological functions: hormonal effects, enzymatic reactions, cell recognition, electron transport, etc. 5.

Recognition and transmission of information function (mainly dependent on glycoproteins). 6.Substance transport function:

The exchange of substances between the cell and its surroundings is achieved through the transport function of the cell membrane.

The structural characteristics are:1Divided by constituent elements:

The components that make up the cell membrane are phospholipids, glycoproteins, glycolipids, and proteins. 2.According to the composition structure:

The phospholipid bilayer is the basic scaffold that makes up the cell membrane. The main components of cell membranes are proteins and lipids, which contain small amounts of sugars. Some of the lipids and sugars combine to form glycolipids, and some proteins and sugars combine to form glycoproteins.

3.Chemical composition: Cell membranes are mainly composed of lipids (mainly phospholipids), proteins, and sugars.

Among them, proteins and lipids are the main ones. Under the electron microscope, it can be divided into three layers, that is, there is a thick electron dense band on the inner and outer sides of the membrane, and a thick zona pellucida band is sandwiched in the middle, and the total thickness is about about This structure is not only seen in various cell membranes, but also has similar structures in various organelle membranes such as mitochondria and endoplasmic reticulum.

1. Structural characteristics: it has a certain fluidity.

1) Reason: Protein molecules and lipid molecules in the membrane structure are movable.

2) Performance: amoeba.

Deformation movement. Cell fusion, endocytosis.

exocytosis and transport of the carrier to the corresponding substance, etc.

3) Influencing factors: Mainly affected by temperature, within the appropriate temperature range, with the increase of external temperature, the fluidity of the membrane is enhanced, but if the temperature exceeds a certain range, it will lead to the destruction of the membrane.

2. Functional characteristics: with selective permeability.

1) Performance: Plant root pairs.

Mineral elements. Selective absorption of nerve cells.

Absorption of K+ and excretion of Na+, tubular.

reabsorption and secretion, absorption of the small intestine, etc.

2) Reason: heritability determines the type of vector, and the number determines selectivity.

[Structural characteristics: there is a certain liquidity].

Functional characteristics: select permeability].

Also known as cytoplasmic membrane.

And here's why.

Most of the phospholipid molecules and protein molecules that make up cell membranes are not stationary but movable.

The phospholipid bilayer is a light oil-like fluid that is fluid.

Most protein molecules are also motile.

Some protein molecules are embedded in the surface of the phospholipid bilayer, some are partially or completely embedded in the phospholipid bilayer, and some run through the entire phospholipid bilayer.

So it's always moving, it's flowing.

The reasons for choosing permeability are:

Protein mosaicing and penetrating the phospholipid bilayer, when some substances enter and exit the cell membrane, they need the help of the carrier on the protein, and the type and number of carriers on the protein are not equal, and each carrier can only carry one substance, so it causes the selective permeability of the cell membrane.

Hope it helps.

Structural characteristics: there is a certain fluidity Functional characteristics: select permeability.

a. Mitochondria are the main site of aerobic respiration, and 95% of the energy of living organisms comes from mitochondria, also known as "power factories", but anaerobic organisms do not contain mitochondria, a is wrong;

b. Ribosomes can synthesize proteins, which are the "synthesis machines" of proteins, which are widely distributed in eukaryotic cells and prokaryotic cells, and B is correct;

c. The endoplasmic reticulum is the "synthesis workshop" of lipids, which can synthesize sex hormones, but the place of cellulose synthesis is the Golgi apparatus, and C is wrong;

d. Lysosomes are "digestion workshops", which have a decomposition effect on the senescent cell structure of their own body under normal physiological conditions

Therefore, b

Answer: The structural characteristics of the cell membrane are that it has a certain fluidity, and this fluidity plays an important role in maintaining the life activities of the cell. This structural feature makes the cell membrane selectively permeable, water molecules can pass freely, and the ions and small molecules that the cell wants to absorb can also pass through, and other ions, small molecules and macromolecules cannot pass through. Therefore, an important physiological property of the cell membrane is that it is selectively permeable, and the cell membrane is a selectively permeable membrane.

The name of the cell membrane in the strict sense should be called the cytoplasmic membrane.

Composed of membrane lipids and membrane proteins, membrane proteins are divided into intrinsic membrane proteins and extrinsic membrane proteins. The lipid bilayer constitutes the basic structure of the membrane, including the lipid raft structure.

Fluidity and asymmetry are essential characteristics of biofilms. It is also a guarantee for the completion of its physiological functions.

The functions of the cytoplasmic membrane are as follows:

It provides a relatively stable internal environment for the life activities of cells.

2Selective transport of substances, including the input of metabolic substrates and the output of metabolites.

Provide cell recognition sites to complete transmembrane transduction of internal and external signals.

4. It provides a binding site for enzymes, which is an efficient and orderly way of enzymatic reactions.

5 mediates cell-to-cell, cell-to-extracellular matrix junctions.

Involved in the formation of specialized structures on the cell surface with different functions.

It is associated with many genetic diseases and becomes the target of diseases**.

You can see Cell Biology, edited by Zhai Zhonghe.

Answer B Question Analysis: The function of the cell membrane depends on the type and quantity of proteins on the cell membrane, and the more the type and quantity of protein, the more complex the function. So option b is correct. A, C, D errors.

Test Center: Examine the structure and function of cell membranes.

On the cell membrane, for lipids, there are mainly phospholipid sources and, cholesterol, glycolipids, which cannot be regarded as much, but there are many of them; For proteins, there are specific receptors, enzymes, surface antigens, carriers, channel proteins, and so on. So B is the answer. You can take a look at the cover of the biology book of the Hail Land Sect and combine it with thinking.

b Proteins are responsible for cell membrane transport carriers, information transmission, recognition and other functions.

b。The greater the type and number of proteins on the cell membrane, the more complex the function of the cell membrane.

The creature of the first year of high school... Must lead suspected of quietly repairing 1 p41 . . . The scumbags are hungry.