Asample of rock is found to contain 200 grams of a parent isotope. how many grams of the parent isotope will remain after one half life

100 grams of sample of parent isotope will be left after the first half life.

Explanation:

Half life of the sample defined as the time taken by the radio active isotope to get reduced to half of its original value present at initial stage.

The initial mass of parent isotope = 200 g

Mass of parent isotope left after the first half life: M

According to definition:

100 grams of sample of parent isotope will be left after the first half life.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation: