Paul and Ann Ehrlich (1981) proposed an alternative called the rivet hypothesis Some species play a small but critical role in keeping the plane, the community, airborne, while other species do not

TLS Online TPP Program

#Id: 8130

#Unit 1. Molecules and their Interaction Relevant to Biology

TLS Online TPP Program

#Id: 6580

#Unit 7. System Physiology – Animal

The walls of the seminiferous tubules are lined by primitive germ cells and Sertoli cells, large, complex glycogen- containing cells that stretch from the basal lamina of the tubule to the lumen

TLS Online TPP Program

#Id: 4673

#Unit 13. Methods in Biology

A related quantitative technique, rocket electrophoresis, does permit measurement of antigen levels. In rocket electrophoresis, a negatively charged antigen is electrophoresed in a gel containing antibody. The precipitate formed between antigen and antibody has the shape of a rocket, the height of which is proportional to the concentration of antigen in the well. 

TLS Online TPP Program

#Id: 1826

#Unit 10. Ecological Principles

dN/dt has its maximum at an intermediate population Size specifically, at N = K/2.

Maximum sustainable yield = rK/2

TLS Online TPP Program

#Id: 5459

#Unit 7. System Physiology – Animal

Depolarization in myelinated axons travels from one node of Ranvier to the next, this “jumping” of depolarization from node to node is called

saltatory conduction