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 correct statement is (b) Nuclear import receptors bind to proteins in the cytosol and bring them to the nuclear pores for transit into the nucleus.

Step-by-step explanation:

The correct statement is (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.

Nuclear transport involves the movement of molecules such as proteins and mRNAs between the nucleus and cytoplasm. Nuclear import receptors are responsible for binding to proteins in the cytosol and facilitating their transport into the nucleus through the nuclear pores. Once the proteins reach the pores, they are released from the receptors and allowed to transit into the nucleus.