Use the Following to Answer Questions
a Researcher Is $\bullet$

question 26

Multiple Choice

Use the following to answer questions
A researcher is interested in studying Drosophila genes that are turned on in response to UV light exposure. She uses a microarray to carry out her experiment and is particularly interested in eight genes shown in the microarray below.
$\bullet$ Vertical stripes mean hybridization to UV light-exposed cell cDNA only.
$\bullet$ Horizontal stripes mean hybridization to nonexposed cell cDNA only (control) .
$\bullet$ Completely filled in means hybridization to both cDNA types.
$\bullet$ Blank means hybridization to neither cell's cDNA.
-Which genes appear to be downregulated in the UV light-exposed group?

• A) 1, 3, and 5
• B) 2 and 7
• C) 4, 6, and 8
• D) 6 only
• E) 4 and 8 only

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