A. 11-nm chromatin fibers consist of a string of nucleosomes.

B. 30-nm fibers have six nucleosomes/turn, which are organized into a two-start helix.

C. Histone H1, histone tails, and increased ionic strength all promote the formation of the 11-nm fiber.

D. Histone octamers are well conserved during replication, with H2A-H2B dimers and H32-H42 tetramers are.

Which of the correct combination of statements

#Question id: 877

#Unit 1. Molecules and their Interaction Relevant to Biology

The sharp transition seen in Figure suggests that

A. Proteins can be denatured by any treatment that disrupts the weak bonds stabilizing tertiary structure, such as heating, or by chemical denaturants such as urea or guanidinium chloride.

B. A comparison of the degree of unfolding as the concentration of denaturant increases reveals a sharp transition from the folded, or native, form to the unfolded, or denatured form, suggesting that only these two conformational states are present to any significant extent.

C. A similar sharp transition is observed if denaturants are removed from unfolded proteins, allowing the proteins to fold.

D. Protein folding and unfolding is an “all or none” process that results from a cooperative transition .

#Question id: 31366

#Unit 5. Developmental Biology

#Question id: 15659

#Unit 8. Inheritance Biology

#Question id: 15872

#Unit 12. Applied Biology

#Question id: 2358

#Unit 2. Cellular Organization

What tiny organelles are attached to the endoplasmic reticulum (ER), forming rough ER?