Answer:
All manifestations of mitosis noted so far occur in animal and plant cells, and there are two differences between them. Astral and anastral mitosis: In astral mitosis, the centrioles of the animal cell are involved in the fibers of the aster. Anastral mitosis, on the other hand, is when we don't find both centrioles and asters in plants.
The other difference is Cytokinesis: In animal cells, since there is no cell wall, there is a strangulation of the plasma membrane, and cytokinesis is called centripetal. In plant cells, due to the presence of a cell wall, it is not possible to have a strangulation division. What occurs is an agglomeration in the equatorial region of vesicles originated from the Golgi complex. These vesicles unite, forming a thin strip, separating the daughter cells. After this process, the synthesis of the cell walls extends from the center to the periphery, under the name of the centrifugal division.
Answer:
Organs
Explanation:
When organs work together, they are called systems.
<span><span>anonymous </span> 3 years ago</span>Proteins are involved in almost all of the cell's functions. They can act as:
Transportation: they can transport hydrophobic molecules in blood for example
Regulation: protein hormones and enzymes
Receptor: can act as receptors on cell surface and in the subsequent signal transduction (G-protein for instance)
It is true that all proteins are made up of up to 20 amino acids, but there are several reasons for their diverse actions:
-One reason is the possible sequence and number of amino acids: Met-Ser-His is different from Met-His-Ser for example. Besides, you have different chain length, for a protein is made up of long chain of polypeptide (longer than 50-70 amino acids) and can have any of the 20 amino acids with repetition, so using simple probability, this can provide up to practically unlimited combination with proteins that have chains of thousands of amino acids.
-Another very crucial reason for the diversity of protein action is the conformation. A protein passes by at least 3 conformational stages before becoming mature. The straight amino acid chain is the primary structure of the protein that can never be active. Spatial modification of this primary structure results in a secondary structure, Helix or Beta-pleated sheets (or other coiling structure), that is also inactive. Further coiling and bending of the secondary structure produce a 3-dimentional conformation that is the active form of the protein. Moreover, many proteins can undergo further conformational rearrangement and combination with other protein sub-units producing a quaternary structure.
The evolution of the eyes has attracted significant study with the study with the eye distinctively it is difficult to estimate the rate eye evolution becausethe fossil
record particularly of the early
Next, after the clouds form, water inside the cloud condenses, forming rain. Is that okay?
