A biologist wants to use a radioactive isotope of nitrogen to radiolabel certain molecules in a culture of cells she is growing. If the biologist incubates her cells with N-15 ( a heavy isotope of nitrogen), which group of macromolecules will be labeled in the culture of cells?

Which statement best describes the relationship between an allele and a gene? question 1 options: an allele is a variation of a gene that can be expressed as a phenotype. an allele is the part of a gene that attaches to messenger rna molecules. an allele is a segment of a dna molecule that controls replication of a gene.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Which genetic disorders, caused by an extra x chromosome (xxy), is characterized by a lack of testicular development in males, effeminate features, possible mental impairment, and a thin stature?