Some biology questions are anxious and urgent, and biology questions are urgent

1.The essential difference is in the nucleus: the nucleus of prokaryotic cells is surrounded by no membrane, the nucleus of eukaryotic cells is surrounded by a double membrane, and the virus has no nucleus.

2.In eukaryotic cells, animal cells do not have a cell wall, while plant cells have a cell wall.

3.The size of the virus.

Most viruses are 100 nm (20 200 nm) in diameter, with larger viruses measuring 300 450 nanometers (nm) and smaller viruses as small as 18-22 nm.

4.Viruses are mainly composed of nucleic acids and protein coats and have no nucleus.

5.The genetic material in eukaryotic cells is all DNA

1.Prokaryotic cells and eukaryotic cells are both cellular organisms; Whereas, a virus is not a cellular organism, it has to parasitize in other cellular organisms in order to survive.

Difference Between Eukaryotic and Prokaryotic Cells:

Eukaryotic cells: nuclei coated with nuclear membranes (essential difference);

There are a variety of organelles; The cell wall is composed of cellulose and pectin;

DNA and proteins combine to form chromosomes, etc.

Organisms contained: animals, plants, fungi, protists.

Prokaryotic cells: nuclei without nuclear membrane coating, so they are called nucleoides;

Organelles have only ribosomes;

The cell wall is made up of polysaccharides and proteins (i.e., peptidoglycan);

DNA does not bind to proteins, so there are no chromosomes.

Contains organisms: bacteria, mycoplasma, chlamydia, actinomycetes, cyanobacteria, etc.

2.Plants in eukaryotes have a cell wall (the composition of the cell wall is: cellulose and pectin).

Animal cells in eukaryotes do not have a cell wall.

The cell wall of prokaryotes is peptidoglycan.

3.Viruses are microorganisms that are smaller than bacteria, have no cell structure, and can only multiply in living cells. Most of them can only be observed with an electron microscope.

4.Viruses have no cellular structure! What to talk about cytoplasm and nucleus! Viruses are mainly made up of nucleic acids and protein coats.

5.With the exception of viruses, etc., living organisms are made up of cells; In cellular organisms, both DNA and RNA are possessed, however, the genetic material is DNA. So, the genetic material of eukaryotes is DNA

Water. Free diffusion of sodium ions. Active transportation.

2.Protein.

3.There is no figure ?..It's trapezoidal.

4.Distribution of inorganic salt ions on both sides of the cell membrane.

1. Free diffusion, active transportation.

2. Protein.

3. Proportional graphics.

4. Ions enter and exit the cell.

1.free diffusion; Active transportation.

2.Proteins (trypsin is what breaks down proteins, so. 3.Proportional graphic resembles a ground segment.

4.Changes in the amount and location of ions inside and outside the cell.

Ribosomes are mitochondria.

A has to pass through the membrane but wears two layers of nuclear membrane, and then it enters the ribosome, and the mitochondria enters the pigment C

Ribosomes are mitochondria.

A Upstairs, you don't need to wear a membrane to enter the mitochondria?

1) Elogeneity (genetically between the offspring of the individual and the parent.

Similar. The phenomenon is called heredity; Variation refers to the existence between offspring and parents, as well as between offspring individuals.

Difference. phenomenon).

aa aaaa can be known from the second set of results.

Tongue curling. It is a dominant trait and cannot be tongue curled.

Recessive traits. So it can be judged. Xiao Ming. Target.

Genotype. is AA, and one of his two genes comes from his father and the other from his mother, so his parents each have a gene A, and because his parents both show dominant traits, all have A genes, so the genotypes of Xiao Ming's father and mother are all AA; Xiaoshan can't roll his tongue, so Xiaoshan's genotype is AA, and one of the A genes comes from his mother, so Xiaoshan's mother must also have an A gene, which is manifested as being able to roll her tongue, and she must also have a gene).