Cellulose microfibrils have an ordered structure and are synthesized at the plasma membrane, given characteristics of microfibrils;

a) Each microfibril is composed of an estimated 18 parallel chains of (1,4)-linked β-D-glucose chains tightly bonded to each other to form a crystalline microfibril

b) Microfibrils have hydrophilic surfaces, populated by polar –OH groups extending from theplane of the sugar rings

c) Microfibrils have hydrophobic surfaces, populated by nonpolar C–H groups populating thesides of stacked glucose chains

 d) microfibril important for enzymatic attack by microbial cellulases, which dock onto the hydrophobic surface and remove one glucan chain at a time

Which of the following from given characterstics of microfibrils is incorrect?

TLS Online TPP Program

#Question id: 27510

#Unit 2. Cellular Organization

As the time passes during the nucleosome assembly then, which of the following fig. is correctly representing the different state of circular DNA

TLS Online TPP Program

#Question id: 27511

#Unit 2. Cellular Organization

Which of the following is true when a Intercalation of ethidium ion into the DNA takes place

a. It unwind the two base pair by 260

b. Reduces the normal rotation per base pair from 360 to 100

c. Increases the normal rotation per base pair from 100 to 360

d. It first removes the negative supercoils and then introduces positive supercoils

TLS Online TPP Program

#Question id: 27512

#Unit 2. Cellular Organization

If a B-DNA having superhelical density  is -0.05 and the value of LK = 200, then what will be the length of DNA

TLS Online TPP Program

#Question id: 27513

#Unit 2. Cellular Organization

Which of the following chemical reagent is used to measure the effect of nicking the DNA

TLS Online TPP Program

#Question id: 27514

#Unit 2. Cellular Organization

Which of the following Histone is involved in stimulates formation of the 30 nm fiber

TLS Online TPP Program

#Question id: 28167

#Unit 2. Cellular Organization

Organism and genes is given

Match them correctly