Lac repressor binds as a tetramer to two operators.

TLS Online TPP Program

#Id: 10401

#Unit 4. Cell Communication and Cell Signaling

Gain-of-function mutations:

1. A promoter mutation resulting increased expression 

2. A DNA rearrangement that places the gene under the control of an enhancer or promoter that results in increased or inappropriate expression of the protein product

TLS Online TPP Program

#Id: 10103

#Unit 4. Cell Communication and Cell Signaling

Hemidesmosomes

Adhesion type- Cell-matrix

Cytoskeletal attachment- Intermediate filaments

TLS Online TPP Program

#Id: 5550

#Unit 7. System Physiology – Animal

The second half of the distal tubule and the subsequent cortical collecting tubule have two distinct cell types:  principal cells and intercalated cells

TLS Online TPP Program

#Id: 2128

#Unit 8. Inheritance Biology

An inversion moves a wild-type allele (red eyes) at the white locus in Drosophila to a chromosomal region that contains highly condensed, the wild-type allele is not expressed in some cells, resulting in a eye consisting of red and white spots.

TLS Online TPP Program

#Id: 9086

#Unit 4. Cell Communication and Cell Signaling

A1 associates with ARF6, a small G protein in host cells which are accessible only when ARF6 is in its active (GTP-bound) form.