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

Define antiketogenic effect of carbohydrate, Define Antiketogenic Effect of...

Define Antiketogenic Effect of Carbohydrate? Presence of carbohydrates is necessary for normal fat metabolism. In the absence of sufficient carbohydrates, larger amounts of fat

The best absorbed in an acidic environment, Why is a weekly acidic drug bes...

Why is a weekly acidic drug best absorbed in an acidic environment?

Cardiac catheterization of mitral stenosis, Q. Cardiac Catheterization of m...

Q. Cardiac Catheterization of mitral stenosis? Cardiac catheterization is rarely needed to diagnose mitral stenosis. An end diastolic gradient more than 5 mm Hg. across mitral

Biological properties of protoplasm, BIOLOGICAL PROPERTIES OF PROTOPLASM - ...

BIOLOGICAL PROPERTIES OF PROTOPLASM - 1 .       Respiration - Oxidation of food to liberate energy is respiration. Every living beings respire but every living beings do no

What are the functions of the cytoskeleton, As the name shows, the cytoskel...

As the name shows, the cytoskeleton is responsible for the supporting of the normal shape of the cell; it also acts as a facilitator for substance transport across the cell and for

Typical vegetation and the typical fauna of the deserts, What are the typic...

What are the typical vegetation and the typical fauna of the deserts? The predominant fauna of the desert ecosystems is formed by reptiles, like snakes and lizards, terrestrial

What are enzyme cofactors, What are enzyme cofactors? Some enzymes requ...

What are enzyme cofactors? Some enzymes require other associated molecules to work. These molecules are known as enzyme cofactors and they can be, for example, organic ions lik

Food-borne zoonoses, Food-borne zoonoses Food-borne illnesses are seri...

Food-borne zoonoses Food-borne illnesses are serious public health problem. They are associated with the ingestion of contaminated foods by microorganisms and their toxins, ma

Explain linolenic acids, Linolenic Acids Fats in this group contain sub...

Linolenic Acids Fats in this group contain substantial amounts of linolenic acid (C18 triunsaturated). Examples are soybean, mustard, rapeseed, flaxseed and wheat germ hemps

Types of mental disorder, TYPES OF MENTAL DISORDER - 1 .       Psycho...

TYPES OF MENTAL DISORDER - 1 .       Psychosis 2 .       Neurosis 3.       Personality & character disorders 1 .       PSYCHOSIS - It effects mental capa

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