This is true. Bonds can be ionic (transferring) or covalent (sharing)
Answer – B.
One of the two main functions of
the nuclear envelope is to allow separation of DNA from cytoplasm machinery. The
other main function of the nuclear envelope is the regulation of contents that
move in and out of the nucleus through small holes called nuclear pores. The nuclear
envelope is sometimes referred to as the nuclear membrane.
The answer is D. these are all chemical reactions.
The answer would be A. Double helix
