PTC Gene & Bitter Taste Test Questions And Answers Guaranteed Success.
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Course
PTC.
Institution
PTC.
In 1931, a chemist named - correct answer Arthur Fox was pouring some powdered PTC into a bottle
-some powder flew into air and a colleague complained that dust tasted bitter (Fox tasted nothing at all)
-tasted again and same results
-Fox had friend...
In 1931, a chemist named - correct answer Arthur Fox was pouring some
powdered PTC into a bottle
-some powder flew into air and a colleague complained that dust tasted bitter (Fox tasted nothing at all)
-tasted again and same results
-Fox had friends and family try it and describe it
-some tasted nothing, intensely bitter, or slightly bitter
PTC stands for - correct answer phenylthiocarbamide (also known as
phenylthiourea)
The chemical structure of PTC resembles - correct answer toxic alkaloids found
in some poisonous plants
PTC itself is NOT - correct answer poisonous and is harmless when tasted
Ratio of tasters to non-tasters varies btwn populations, but every group has - correct answer
some tasters and some non-tasters
-on average: 75% of people can taste PTC while 25% cannot
PTC gene - correct answer TAS2R38
Receptors are - correct answer transmembrane proteins
Geneticists determined that there is an - correct answer inherited component
that influences how we taste PTC
Today, The ability to taste or not taste PTC is conveyed by - correct answer
single gene on chrom #7 that codes for taste receptor on tongue
, PTC gene, TAS2R38 was discovered in - correct answer 2003
There are - correct answer 2 common forms (alleles) and at least 3 rare forms
of PTC gene
Each allele codes for a - correct answer bitter taste receptor protein with a
slightly different shape
-shape of receptor determines how strongly it can bind to PTCC
All people have - correct answer 2 alleles for every gene (one from dad and
one from mom)
Is PTC found in nature? - correct answer No
The ability to taste PTC correlates strongly with - correct answer the ability to
taste other bitter substances that do occur naturally (many of which are toxins)
Plants produce a variety of toxic compounds to protect themselves from being eaten. The ability to
discern - correct answer bitter tastes evolved as a mechanism to prevent early
humans from eating poisonous plants
Humans have about 30 different - correct answer genes that code for bitter
taste receptors
-each receptor can interact with several compounds allowing people to taste a wide variety of bitter
substances
-1 of 30 different genes
-REVIEW
PTC gene has several variable - correct answer nucleotide positions (SNPs), but
only 3 positions account for majority of observed SNPs
-positions are nucleotides 145, 785, and 886
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