Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Eucaryotic cell structure
All eucaryotic cells have a cytoskeleton made up of a network of protein filaments (Figure shown below). This network gives the cell its shape, capacity to move and ability to transport organelles from one part of a cell to another. These protein filaments are similar in all eucaryotes. The important protein filaments are-actin and myosin in muscles and tubulin in microtubules. Actin and myosin are involved in muscle contraction and in the formation of microfilaments. Microtubules are hollow ~d form cilia, flagella, centriole and mitotic spindle. This kind of cytoskeleton is absent in the procaryotes.
In procaryotes the DNA molecule lies freely in the cytoplasm attached to the cell membrane. In eucaryotes it is enclosed inside the nucleus. This kind of formation of compartment protects DNA from many chemical changes that occur in the cytoplasm.
The DNA found in eucaryote is not only large (human cells contain DNA thousand times larger than that in a typical bacteria) but is also packed together with histones into / chromosomes. Histones are the proteins which are basic in nature, found in eucaryotes/They bind to DNA and wrap it up into compact chromosomes. Histones also-control the expression of the characters called gene expression. Histones are important proteins which have nbt undergone any change during evolution and are identical in all plant and animal cells studied so far. Division of the nucleus by mitosis is another characteristic of the eucaryotes which permits proper and equal distribution of the genetic material to the daugher cells. Ribosomes which are the granular structures consisting of RNA and proteins are necessary for protein synthesis. These are the only organelles that are common to both procaryotes and eucaryotes. However, there are some minor differences between procaryotic and eucaryotic ribosomes.
Prothoracic Gland or PTC Prothoracic gland (PTC) or moulting gland and ecdysone or moulting hormone The 3 rd endocrine gland-prothoracic gland- is an irregular branching
Q. How to Investigate mitral stenosis by Electrocardiogram? Electrocardiographic changes are not specific for mitral stenosis and are never diagnostic for any valvular heart di
Which of the following statements is true? Answer Viruses are distinct from cells by the absence of a lipid membrane around them. Viruses are parasites that require the cell's meta
Q. Which is the kind of nitrogen waste eliminated by beings of the class Reptilia? These beings excrete mainly uric acid this substance is less toxic than ammonia and it can be
Human lungs A pair of spongy, elastic and bag like structures of lungs is present in the chest cavity, one on either side of the heart. Lungs are enclosed by a double lay
Describe about the mitochondrial membranes The composition of the two mitochondrial membranes is entirely different. The outer membrane is rich in lipids and contains nearly 50
Question 1 Give an account of t-RNA 2 Write short note on Competitive inhibition 3 What are ketone bodies? Write the mechanism of ketogenesis 4 Describe the properties of nucle
economic importance
Q. How do embryos of placental mammals excrete nitrogen wastes? Placental animals including embryos and excrete urea, In the adult placental mammal urea is excreted through the
lesson plan practical requirements
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd