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 major sources of water - water intake, Define Major Sources of water...

Define Major Sources of water - Water Intake? The preformed water that we consume as water or as beverage. This will include both preformed water in fluids and in foods. The am

Name the alpha-islet cells of the pancreas, Person X is a healthy human who...

Person X is a healthy human who has volunteered to take experimental drug Y.  Person X has a normal dinner at 6 PM on April 1 and then does not eat for 12 hours.  At 5 PM on A

Bioclimatology effect of climate on distribution of organism, Bioclimatolog...

Bioclimatology: This is the study of effect of climate on distribution of organisms. Bioclimatology is the inter-disciplinary field of science which studies the interactions betwe

Phytoflagellates - protozoan, Phytoflagellates – Protozoan Phytoflagel...

Phytoflagellates – Protozoan Phytoflagellates are autotropbs that possess chlorophyll or other related pigments, and store food as fats, oils and starches (other than glycogen

State the stabilization of haem pigments, State the Stabilization of haem p...

State the Stabilization of haem pigments Ligands suggested for the stabilization of haem pigments are imidazole (and its derivatives), S-nitrosocysteine and nitrite. Whereas se

Explain difference between sonication and homozinization, Homogenization is...

Homogenization is intensive blending of mutually related substances or groups of mutually related substances to form a constant of diverse insoluble phases (sometimes withaddition

Difference between cryptogamic and phanerogamic plants, What is the differe...

What is the difference among cryptogamic and phanerogamic plants? Cryptogamic (hidden sex organs) plants are those that do not show flowers or seeds. They comprise the bryophy

Homeostasis , The state of balance in the internal environment of the body ...

The state of balance in the internal environment of the body it includes control of the water balance of the blood, body temperature, blood sugar level and blood urea level. Each o

What is lipid-lowering trial, Q. What is Lipid-lowering Trial? Aggressi...

Q. What is Lipid-lowering Trial? Aggressive lipid-lowering drug treatment of persons at various risk levels reduces Coronary Artery Disease morbidity and mortality rates and in

Formation of blastopore, Formation of Blastopore The slit such as ope...

Formation of Blastopore The slit such as opening of the initial groove is the opening of the developing blastopore and its dorsal rim is termed as the dorsal lip of blastopor

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