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

Explain the catabolic responses, Explain the Catabolic Responses? Hormo...

Explain the Catabolic Responses? Hormonal responses during the hyper inetabolic phase of infection are same as in case of injury. Serum cortisol levels are elevated, glycogen i

Immunolocalization, uses and advantages and disadvantages of immunolocaliza...

uses and advantages and disadvantages of immunolocalization

Describe the blood sugar testing, A small drop of blood is required to perf...

A small drop of blood is required to perform the test and this can be easily obtained from the patient's fingertip. A large number of glucometer devices are easily available and t

Where would expect to see its growth, If you inoculate an organism know to ...

If you inoculate an organism know to chemically reduce sulfur (as done by organisms capable of anaerobic respiration), where would you expect to see its growth in the test medium u

Is it possible x chromosome of women come from father, Is it possible that ...

Is it possible that an X chromosome of a woman can have come from her father? It isn't only possible that an X chromosome of a woman is from her father, it is certain. Each wom

Define starch - carbohydrates, Define Starch - Carbohydrates? Starch is...

Define Starch - Carbohydrates? Starch is the major form of stored carbohydrate in plants. Starch, as you may already know, is composed of a mixture of two substances: amylose,

Maintain nutrition in diarrhoea, Maintain nutrition Your responsibilit...

Maintain nutrition Your responsibility as a nurse is to take care of nutrition and prevent the child from starvation. Breast feeding'should be continued during the diarrhoea e

Primitive arthropods, Primitive Arthropods The primitive arthropods, O...

Primitive Arthropods The primitive arthropods, Onychophora (for example Peripatus) have a series of paired legs which are not jointed but have a ringed appearance because of t

Explain components of second heart sounds, Explain Components of second hea...

Explain Components of second heart sounds? The first component of S 2 is due to closure of aortic valve (A,). The second component is due to closure of pulmonary valve (P 2 ).

Predominantly affects of gout disease, Q. Predominantly affects of gout dis...

Q. Predominantly affects of gout disease? The disease predominantly affects males after the age of 35 years. Gout starts suddenly with an arthritic pain in the big toe and may

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