Which of the following statements about the import of protein to the nucleus is correct? choose all that apply.

an nls can be a monopartite or bipartite signal which includes a significant number of basic amino acids.
gtp is required for an importin to bind to an nls of a protein destined to be localized to the nucleus.
ribosomal proteins must display an nls to be localized to the nucleus, and an nes to be localized to the nucleolus.
the recycling of importins back to their original conformation requires gtp hydrolysis in the cytoplasm.

The correct statements are:

•An NLS can be a monopartite or bipartite signal which includes a significant number of basic amino acids.

• The recycling of importins back to their original conformation requires GTP hydrolysis in the cytoplasm.

The other answers are incorrect because GTP is not required for an importin to bind to an NLS but for the release of importin and an NES or nuclear export signal  is the sequence  in a protein for export from the cell nucleus to the cytoplasm, not to the nucleolus.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.