A cell does not want to waste energy synthesizing the amino acid arginine if arginine is present in its diet. Therefore, when arginine is present, it activates a repressor protein to prevent transcription of genes that code for enzyme to make arginine. This is an example of what type of regulation?

TLS Online TPP Program

#Question id: 34102

#Unit 2. Cellular Organization

The CenH3 nucleosomes form the chromatin foundation for recruitment and assembly for 

TLS Online TPP Program

#Question id: 34103

#Unit 2. Cellular Organization

A. A CEN fragment derived from one chromosome can replace the centromere of another chromosome with no apparent consequence.

B. CEN are used simply to attach the chromosome to the spindle, and play no role in distinguishing one chromosome from another.

TLS Online TPP Program

#Question id: 34104

#Unit 2. Cellular Organization

The Centromeric DNA sequence that binds to Cse4

TLS Online TPP Program

#Question id: 34105

#Unit 2. Cellular Organization

A. The histone H3 variant Cse4 is incorporated in the centromeric nucleosome.

B. The CBF3 protein complex that binds to CDE-III is essential for centromeric function.

C. The proteins that bind CEN serve as an assembly platform for the kinetochore and provide the connection to microtubules.

Find true and false

TLS Online TPP Program

#Question id: 34106

#Unit 2. Cellular Organization

Isolated telomeric fragments do not behave as though they contain single-stranded DNA; instead, they show aberrant electrophoretic mobility due to

TLS Online TPP Program

#Question id: 34107

#Unit 2. Cellular Organization

A. Lampbrush chromosomes are formed during an unusually extended mitosis

B. The lampbrush chromosomes are meiotic bivalents, each consisting of paired homologous chromosomes that have been replicated

C. The lampbrush chromosomes are held together only by chiasmata that indicate points of chromosome crossover.

D. The loops around Lampbrush are surrounded by a matrix of ribonucleoproteins that contain nascent RNA chains.