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Biology Life 102
Ana's Freebies Exam 4- Bjostad
5
Biology
Undergraduate 1
12/10/2012

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Term
The tryptophan operon is a repressible operon that is
Definition
Turned off whenever tryptophan is added to the growth medium.
Term
Why are viruses referred to as obligate parasites?
Definition
They cannot reproduce outside of a host cell.
Term
A transposon acts differently from other types of genetic recombination because it:
Definition
Scatters genes to new loci in the genome.
Term
Homology is
Definition
Similarity resulting from common ancestry.
Term
Sparrows with average‐sized wings survive severe storms better than those with longer or shorter wings, and this illustrates
Definition
Stabilizing selection.
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