Objection of cell theory, Biology

Assignment Help:

OBJECTION OF CELL THEORY (REASONS OF DISCARTION)

(i)       Living organism are composed of various types of cells and their product but members of monera & protista don't have a cellular organisation, they have protoplasmic grade & organization.

Cell theory is not applicable on viroids, Viruses, Prions.

(ii)      In multicellular organism one type of cell perform one type of function. It doesn't perform all vital activities.

(iii)         Gene is the hereditary unit of life according to modern view - Physical unit of life = Gene

Chemical unit of life = DNA

(iv)      In plants many dead cells are present, which also have specific function. Vessels and Tracheids of Xylem are dead cells but helps in conduction of water & minerals. In human beings, cells of stratum corneum (outermost layer of skin) are dead & helps in protection.

(v)      It was not discarded but modified by Nageli, he just added "through cell division" while omnis cellula e cellula means that cells arise inside the cell. According to Karl nageli "new syncytes arise from division of pre-existing cells".


Related Discussions:- Objection of cell theory

Absorption of amino acids and peptides, Absorption of amino acids and  pep...

Absorption of amino acids and  peptides Generally,  the  dietary proteins are almost comp!etely  digested to their constituent amino acids and these are rapidly absorbed  from

Define role of lipids in controlling gene expression, Define role of Lipids...

Define role of Lipids in Controlling Gene Expression? In the lipogenic pathway, the genes that encode the enzymes of the fatty acid synthase complex are co-ordinately expressed

Explain amprenavir, Explain Amprenavir Amprenavir (APV, Agenerase) - A...

Explain Amprenavir Amprenavir (APV, Agenerase) - Amprenavir is available in large capsules and in an oral solution; full doses require 16 capsules or 187 mLdaily. Both prepara

One benefit of including vegetable fibre in the diet, State one benefit of ...

State one benefit of including vegetable fibre (roughage) in the diet   Vegetable fibre retains water (keeping the faeces soft and bulky), stops constipation, decreases the

Into which classes are mollusc divided, Into which classes are mollusc divi...

Into which classes are mollusc divided? What are some representing beings of each class? The phylum Mollusca is separated into five major classes: pelecypods, or bivalves (Pele

Diversity is good axioms of conservation biology, "Diversity is good" is on...

"Diversity is good" is one of the axioms of conservation biology. However in absentia of historical information, why is noting higher diversity in a system NOT the best way to eval

Determine the end of the meiotic process during oogenesis, What is the rela...

What is the relation among fecundation and the end of the meiotic process during oogenesis? The oocyte II only completes the second meiotic division (interrupted at metaphase) i

What is the non-paralytic squnit, Concomitant or Non-Paralytic Squnit ...

Concomitant or Non-Paralytic Squnit This type of squint usually occurs when there is an obstacle in the sensory pathway of binocular reflex such as refractive errors, opacities

Important concepts in developmental biology, DEFINITIONS E mbryolog...

DEFINITIONS E mbryology - Study of embryo is called as embryology. Zygote to emrbyo in uterus Developmental biology - Study of pre natal period & post natal period

Define the effect of breastfeeding on mother, Normal 0 false ...

Normal 0 false false false EN-IN X-NONE X-NONE

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