Cambrian - Most marine invertebrates. Ozone layer forms

TLS Online TPP Program

#Id: 8892

#Unit 2. Cellular Organization

Amphitelic attachment, 

sister kinetochores attach to microtubules emanating from opposite spindle poles, they are stably attached

TLS Online TPP Program

#Id: 3038

#Unit 3. Fundamental Processes

Core polymerase and the clamp dissociate at completion of Okazaki fragment synthesis and reassociate at the beginning.

TLS Online TPP Program

#Id: 10108

#Unit 4. Cell Communication and Cell Signaling

Tight junctions seal off body cavities and restrict diffusion of membrane components

TLS Online TPP Program

#Id: 7032

#Unit 11. Evolution and Behavior

In the most famous example of Lamarck’s theory, giraffes must have stretched their necks to reach foliage above them, and so their necks were lengthened. The longer necks were inherited, and over the course of generations, this process was repeated, and their necks got longer and longer. 

TLS Online TPP Program

#Id: 3629

#Unit 3. Fundamental Processes

When several codons encode the same amino acid and utilize multiple tRNAs, not all of the codons are used with equal frequency. In a phenomenon called codon bias.