Question

Which of the following statements about nuclear transport is true?

(a) mRNAs and proteins transit the nucleus through different types of nuclear pores.
(b) Nuclear import receptors bind to proteins in the cytosol and bring the proteins to the nuclear pores, where the proteins are released from the receptors into the pores for transit into the nucleus.
(c) Nuclear pores have water-filled passages that small, water-soluble molecules can pass through in a nonselective fashion.
(d) Nuclear pores are made up of many copies of a single protein.

Answer 1

The true statement about nuclear transport is that nuclear import receptors bind to proteins in the cytosol and transport them through nuclear pores into the nucleus, a process powered by ATP hydrolysis.

Step-by-step explanation:

The correct statement about nuclear transport is: Nuclear import receptors bind to proteins in the cytosol and bring the proteins to the nuclear pores, where the proteins are released from the receptors into the pores for transit into the nucleus. This process involves the complex of the two proteins approaching a nuclear pore and interacting with nuclear pore fibrils, which causes the pore to open and allow the proteins to cross into the nucleus, an active transport powered by ATP hydrolysis. Additionally, RNA molecules such as mRNAs are transported to the cytoplasm through the nuclear pore complex and the stability of their presence in the cytoplasm can be managed, influencing the amount of protein ynthesized .