8. Which of the following affect the sedimentation of a particle? mass shape the

Question

8.

Which of the following affect the sedimentation of a particle?

mass

shape

the density of the solution

All of the above.

a and b

10.

Which statement is correct concerning the T (deoxy) and R (oxy) states of tetrameric hemoglobin?

In the T to R transition, the central cavity of the tetramer decreases in size, preventing the binding of the allosteric modulator, 2.3-bisphosphoglycerate.

The R form involves interchain salt links that are broken in the transition to the T form

In the T to R transition, the positions of the several helices change, but the position of the iron atom in the heme remains fixed

In the Bohr effect, lowering the pH preferentially stabilizes the R form and enhances oxygen binding

None of the statements are correct

11.

Which of these contains a thioester bond?

-ketoglutarate

cystine

N-acetylglucosamine

ATP

Succinyl-CoA

mass

shape

the density of the solution

All of the above.

a and b

Explanation / Answer

1. D All of the above affects the sedimentation of the particle,

2. C In the T to R transition, the positions of the several helices change, but the position of the iron atom in the heme remains fixed

3. B cysteine consists of S bond which represents Thioester bond . R- S-Co-R bond represents thioesters bond,

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