If a String of Length L, Fixed at Both Ends

question 53

Multiple Choice

If a string of length L, fixed at both ends, is made to resonate at its lowest possible frequency, what is the wavelength associated with that resonance?

• A) L
• B) 2L
• C) L/2
• D) 0.707 L
• E) 1.414 L

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Definitions:

Paralogs

Genes within the same organism that have evolved by duplication and may have different functions.

Gene Family

A group of genes sharing a common origin that typically encode proteins with similar functions.

Molecular Clock

A method used to determine time based on base pair substitutions. Molecular clocks use the rates of molecular change to deduce the divergence time between lineages in a phylogeny, for example. They work best when they can be “calibrated” with other markers of time, such as fossils with known ages and placements.

Synapomorphy

A trait that is shared by two or more taxa and their most recent common ancestor, used to infer evolutionary relationships.