________ make it possible for researchers to study how an entire genome responds to an environmental stimuli.
A) Gene knockouts
B) PCR reactions
C) DNA microarrays
D) Shotgun sequences

Question

Quizplus · Accepted Answer

DNA microarrays allow researchers to study how the expression levels of all genes in a genome change in response to a particular environmental stimuli. This is done by comparing the levels of mRNA present in a sample before and after exposure to the stimuli, using the microarray to measure the expression level of each gene in the genome. Gene knockouts, PCR reactions, and shotgun sequencing are all useful techniques for studying individual genes or small sets of genes, but they are not as effective for studying the response of an entire genome to an environmental stimuli.

________ Make It Possible for Researchers to Study How an Entire