Populations of some species are prone to extinction for two reasons

1. The landscapes they live in are patchy (making dispersal between populations difficult).

2. Environmental conditions often change in a rapid and unpredictable manner.

TLS Online TPP Program

#Id: 1309

#Unit 2. Cellular Organization

E1’s ion-binding sites are exposed to the cytoplasm, and it has high affinity for Na+ but low affinity for K+

TLS Online TPP Program

#Id: 1310

#Unit 2. Cellular Organization

E1’s ion-binding sites are exposed to the cytoplasm, and it has high affinity for Na+ but low affinity for K+

TLS Online TPP Program

#Id: 1311

#Unit 2. Cellular Organization

E2’s ion binding sites are exposed to the exterior of the cell and it has low affinity for Na+ but high affinity for K+

TLS Online TPP Program

#Id: 1312

#Unit 2. Cellular Organization

Cardiac glycosides (e.g., ouabain and digitalis) are a class of drugs that inhibits Na+-K+ ATPase.

TLS Online TPP Program

#Id: 1504

#Unit 2. Cellular Organization

Microtubules are polymers of the protein tubulin.

TLS Online TPP Program

#Id: 1505

#Unit 2. Cellular Organization

The tubulin subunit is a heterodimer formed from two closely related globular proteins called a-tubulin and b-tubulin.