How DNA Replication and Mitosis Occurs in Cells
The essential property of a genetic material is that it should be able to replicate accurately in a process known as mitosis or meiosis for…
Biology
The Functional Role of Releasers in Behavioral Responses
For convenience we may distinguish between three kinds of stimuli: those which determine the animal’s state of responsiveness called motivational stimuli, and those which elicit…
Effects of Pheromones and Hormones on the Sexual Behavior of Stickleback
The stickleback is a family of marine fish that is carnivorous in its feeding habits by preying on crustaceans, fish larva and insects. Some are…
Excretion and Osmoregulation in Marine Invertebrates
There is good reason to suppose that life began in the sea. Many animals, notably marine invertebrates such as sea anemones, spider crabs and star…
Internal Environment and the Formation of Intercellular Fluid
One of the generalizations to emerge from physiological studies in the present century is that the conditions in which cells can function properly are narrow….
The Role of the Xylem Tissue in the Uptake of Water
That the xylem tissue is responsible for water transport can be shown by various experiments. How then does a xylem tissue carry out this function?…
How DNA Controls the Biochemical Processes of a Cell
DNA exerts a potent influence over the biochemical processes which take place in cells. Much of the evidence for this has come from the study…
The Importance and Role of the Nucleus in Cell Division
If a fertilized egg is deprived of its nucleus it fails to develop properly; in fact the enucleated egg usually dies unless the nucleus is…
How to Engineer Tissue Culture and Grafting for New Embryo Development
The answer to these questions has come from two different types of experiment — Tissue Culture and Grafting. Before we delve into the subject above, we must…
The Chemical Nature of Organizers as Explained by Spemann and Mangold
The chemical nature of Organizers can only be well explained after we have examined the powerful influence exerted by chorda and mesoderm on neighboring tissues…