When We Make an Observation of a Distant Galaxy 10

question 54

Multiple Choice

When we make an observation of a distant galaxy 10 billion light-years away, we are seeing this galaxy as it

• A) is right now
• B) was when the universe was only 10 billion years old
• C) was when the universe was formed
• D) was when the universe was only 4 billion years old

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Definitions:

Bacterial Colony

A visible mass of microorganisms all originating from a single mother cell, growing together on a solid medium.

Recombinant Plasmid

A circular DNA molecule engineered to carry specific gene sequences, used in genetic engineering to clone or express particular genes.

DNA Probe

A labeled single-stranded DNA fragment used to detect a gene of interest in a hybridization experiment.

cDNA Libraries

Collections of complementary DNA (cDNA) molecules synthesized from the messenger RNA of an organism, used to study gene expression and protein function.