Question

1. The formation of a stable ternary complex involving Ran GTPase, a nuclear transport receptor, and a cargo protein occurs in ...

A. both nuclear import and export.

B. nuclear import , but not export.

C. nuclear export, but not import.

D. neither nuclear import nor export.

2. Compared to the cytosol, which of the following is generally true about the lumen of the endoplasmic reticulum in our cells?

It has a much higher calcium ion concentration.

It has a higher pH.

It has a more reducing environment.

It has a higher density of ribosomes.

All of the above.

Answer 1

solution

question 2-correct option is - Endoplasmic reticulum has much higher concentration of calcium than cytoplasm.because it stores more calcium than cytoplasm.

the ph of ER and cytoplasm is 7.2 same for both.

ER has more oxidising environment than cytoplasm.

ER has same density ribosomes like cytoplasm that is 80 S type.

que 1 answer

The stable ternary complex of Ran GTP, receptor protein and cargo proteins are involved in nuclear export and import both.

nuclear import receptor nuclear export receptor Ran-GDP DISSOCIATION cargo delivered to cytosol protein- Ran-GDP Ran-GDP with nuclear localization signal CYTOSOL NUCLEUS protein with nuclear export signal Ran-GTP Ran-GTP BINDING cargo delivered to nucleus Ran-GTP