Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Cell Theory
The invention of the compound microscope in the 17th century stimulated the interest in living things not visible to the naked eyes. Thus, Robert Hooke discovered 'cells' in 1665 by examining cork slices (,under a crude microscope. He was actually describing the spaces occupied by the cells limited by the cellulose walls. Hooke and his contemporaries also described cells from other plants and animals.
Figure: A generalized plant (a) and animal (b) cell. No one cell of either plant (a) or animal (b) has all the characteristics shorn in these composite figures. Both these are
However, cell theory, one of the greatest and most basic generalizations of biology, was formulated only about 200 years later. Two German investigators, Schleiden a botanist (1838), and Schwann, a zoologist (1839) are credited with presenting independently the first concise, yet comprehensive, statements about the cell. They pointed out that, "All plants and. animals are made up of small fundamental units called cells and that some organisms are unicellular and others, multicellular." Subsequent researched to the expansion of this concept by including further information on cells. We know that cells are surrounded by cell membrane and contain cytoplasm and nucleus and, most importantly, cells divide into roughly equal daughter cells by a process called cell division. Thus it became known that new cells come into existence only by the division of previously existing cells. In other words, cells do not arise by spontaneous generation from nonliving matter. It follows that all cells living today can trace their ancestry back to those which existed in ancient times.
Q. Since pepsin is a gastric enzyme does it have a basic or an acid optimum pH? What happens to pepsin when it passes into the duodenum? Pepsin acts contained by the stomach so
Basic Planes of Cleavage The basic planes along which the egg and its daughter blastomeres are divided during early cleavage are: A. Meridional Plane - the cleavag
Define the Goals of treatment of Obesity? As said in the beginning, the goal of treatment of obesity today has shifted from mere 'weight loss' to 'weight management'. Each weig
Assume that the blood volume of a rabbit is 0.5 liters. If the effective dose of the anesthetic urethane is 10 micrograms/mL, calculate the volume of a 25% urethane solution that m
Explain Electron Volt Electron Volt: Amount of kinetic energy obtained by an electron, initially at rest, after undergoing an acceleration by a one volt potential difference.
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Determination of Neural Ectoderm by Induction Earlier you know that the dorsal mesoderm induces the ectoderm to differentiate into neural tissue. Spemann and his co-workers co
Classification of Diabetes Mellitus a) Type1Diabetes Mellitus i) Type 1 a ii) Type 1 b b) Type 2 Diabetes Mellitus c) Others i) Gestational Diabetes Mellitus
What are the five human digestive secretions? Which of them is the only one that does not contain digestive enzymes? The human digestive secretions such as: saliva, gastric jui
ELECTRON MICROSCOPY (EM) In EM, the object is viewed by a beam of electrons instead of visible light. An electron beam has a shorter wadelength (h = 0.004 nm) compared with vis
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd