DNA Microarrays

What specific aspect of gene expression does the DNA Microarray experiment focus on?

• The role of gene expression in metabolic pathways

• Differences in gene expression across four cancer patients

• The impact of environmental factors on gene expression

• Gene expression in non-cancerous cells

What type of light source is recommended for use with the DNA Microarray experiment?

• Incandescent light

• LED light

• Hand-held long wave UV light

• Fluorescent light

Tags

NGSS.HS-PS4-4

As of the completion of the Human Genome Project, how much of the human genome was estimated to contain protein-coding genes?

• About 21,000 genes

• About 100,000 genes

• About 50,000 genes

• About 30,000 genes

What is the approximate percentage difference in DNA sequences between individuals according to the Human Genome Project data from 2005?

• 1%

• 0.2%

• 5%

• 10%

What is the main function of microarrays in genetic research?

• To classify and assign functions to uncharacterized genes

• To create new types of gene therapies

• To sequence DNA

• To produce proteins

What is the purpose of using two different fluorescent tags in DNA microarray analysis?

• To increase the visibility of the microarray under normal light

• To distinguish between control and experimental samples

• To enhance the binding efficiency of cDNA to the microarray

• To prevent degradation of the mRNA samples

What is the role of reverse transcriptase in the process of cDNA synthesis?

• It digests mRNA to prevent contamination

• It labels the cDNA with fluorescent tags

• It synthesizes cDNA from mRNA using the RNA as a template

• It scans the microarray to detect fluorescent signals

How is the data from a DNA microarray analysis interpreted?

• By measuring the size of the cDNA fragments

• By counting the number of cDNA molecules

• By analyzing the color and intensity of fluorescence at each spot

• By determining the weight of the microarray chip

What does a green spot on a DNA microarray typically indicate about the mRNA levels from the control (healthy) sample compared to the experimental (diseased) sample?

• Higher mRNA levels in the control sample

• Lower mRNA levels in the control sample

• No difference in mRNA levels between the samples

• mRNA levels are not detectable in either sample

Tags

NGSS.HS-LS1-1

What does a red spot on a DNA microarray suggest about the gene's expression in the cancer sample?

• The gene is down-regulated

• The gene is up-regulated

• The gene expression is unchanged

• The gene is not present in the sample