Nuclear membrane - structure of nucleus, Biology

Assignment Help:

KARYOTHECA OR NUCLEAR MEMBRANE

  1. It is also called Nucleolemma, term given by Erclab & Hertwig.
  2. Karyotheca composed of two unit membranes separated by a 150-300 A° wide perinuclear space. Outer membrame may have 80s ribosomes.E.R. is connected to outer nuclear membrane at several places.
  3. Just beneath inner nuclear membrane, there is a fibrous layer called fibrous lamina. It provides strength to nuclear membrane and also provides attachment site to peripheral heterochromatin.
  4. Nuclear membrane is perforated by nuclear pores of 400 - 1000 Aº diameter with space 1500 Aº . In the oocyte of frog (Xenopus laevis) 30 million nuclear pores are present. Nuclear pores are covered by an octagonal structure composed of eight granular subunits called Annulus or Bleb. Anulus and nuclear pore collectively called pore complex.
  5. These pores regulates transport bet. nucleoplasm and cytoplasm, Small ions like K+, Na+ and Cl- move through nuclear membrane while t-RNA ,r-RNA and m- RNA pass through nuclear pores. Protein nucleoplasmin which occur in pore complex regulates the nucleo cytoplasmic traffic .

357_nucleus.png


Related Discussions:- Nuclear membrane - structure of nucleus

Ecology, Importance of ecology

Importance of ecology

How are genetic diseases classified, How are genetic diseases classified? ...

How are genetic diseases classified? The Genetic diseases classify into chromosomal abnormalities and genetic mutations. Between chromosomal abnormalities there are the aneu

Do enzymes act better under basic or acid ph, Q. Do enzymes act better unde...

Q. Do enzymes act better under basic or acid pH? Most enzymes act in pH between 6 and 8, a range that corresponds to the general acidic level of blood and cells. There are enzy

How can i become involved in supporting brain research, How can I become in...

How can I become involved in supporting brain research? A. Here are some ways which you can support brain research: Join in activities of Brain Awareness Week. Dona

Depleted (vulnerable) species, Depleted (Vulnerable) Species These are...

Depleted (Vulnerable) Species These are the species whose numbers are greatly reduced from those of the recent past, and they are continuing to decrease. It is the continued d

Explain pregnancy and diabetes mellitus, Explain Pregnancy and Diabetes Mel...

Explain Pregnancy and Diabetes Mellitus? During pregnancy, a woman who has pre-existing chronic disease requires special care, especially in case of mother's suffering from dia

Explain anabolic reactions, Anabolic reactions: The  intermediates of citr...

Anabolic reactions: The  intermediates of citric acid cycle are used  as precursors  in tlie biosynthesis of many compounds  like synthesis of glucose  from carbon skeletons of am

What microbiology lab technician left the safranin out, If a microbiology l...

If a microbiology lab technician left the safranin out of the Gram stain procedure, what would be the result?

What is bidirectional glenn without cardio pulmonary bypass, What is Bidire...

What is Bidirectional Glenn (BDG) without Cardio Pulmonary Bypass Surgical approach is through median sternotomy. If there is only a single superior vena cava some surgeons pre

Blood flow, if i start in the superior mesenteric vain where do i have to g...

if i start in the superior mesenteric vain where do i have to go through to get to the left anterior circumflex humeral artery. by the way of the hepatic portal vein and the heart

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd