Which molecules do not normally cross the nuclear membrane? - nucleotide triphosphates - proteins - mrna. - dna

Answer : DNA is the molecule that normally doesnot cross the nuclear membrane.

Explanation:

The functioning of DNA is always from inside the nucleus and it does not needs to be transported anywhere for its functioning. Hence, DNA would be the molecule that will most likely never cross the nuclear membrane.

Rest all molecules like the gene regulatory proteins, mRNA, RNA processing proteins etc are selectively monitored and they pass in and out of the nuclear membrane.

The nuclear membrane can be described as a lipid bi-layer membrane which surrounds the nucleus and is only present in the eukaryotic cells. The DNA is properly packed inside the nucleus enclosed by the nuclear membrane.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

the correct answer is d