Bio Lab Taste Test Papers Article
Unlock all answers in this set
Unlock answersquestion
Who initiated the interest of using chemicals in taste test reactions to study genetics?
answer
Arthur L. Fox
question
What did Arthur L. Fox do?
answer
Showed that many people are unable to taste phenylthiocarbamide.
question
How does phenylthiocarbamide (PTC) taste to most people?
answer
Either extremely bitter or tasteless
question
Who reported that some people assign different tastes to PTC than the majority?
answer
Blakeslee and Salmon
question
How will PTC taste to an individual with a homozygous recessive \"PTC\" gene?
answer
Tasteless
question
What percentage of the North American white population are homozygous tasters (dominant)?
answer
20%
question
What percentage of the North American white population are heterozygous tasters?
answer
50%
question
What percentage of the North American white population are homozygous nontasters (recessive)?
answer
30%
question
What can cause a taster to not be able to taste PTC?
answer
Dissolving the PTC in something other than the taster's own saliva.
question
What else affects being able to taste PTC besides genetics and solvent?
answer
Concentration
question
In Blakeslee's experiment, what percentage of people could not taste a .02% solution of PTC?
answer
75%
question
In Blakeslee's experiment, what percentage of people could not taste a .64% solution of PTC?
answer
15%
question
What did Blakeslee's experiment regarding concentration of PTC conclude?
answer
Some people have a higher taste-sensitivity threshold for PTC than others.
question
What did Blakeslee report at the American Museum of Natural History in connection w/ the Eugenics Congress in 1932?
answer
That 79.7% tasted PTC in medium concentration. Of these, 65.4% reported a bitter taste, while the rest reported a sour taste, sweet taste, salty test or something else.
question
In Harris and Kalmus study how many of their 441 people could taste a .16mg/liter sample of PTC?
answer
1
question
In Harris and Kalmus' study, how many of their 441 sample could not taste PTC until its concentration was 1300mg/liter?
answer
31
question
Harris and Kalmus report that a substance similar to PTC creates a nauseating taste for both tasters and nontasters of PTC, what is this substance?
answer
Thiocarbamide or thiourea
question
What is sodium benzoate sometimes used for and in what concentration?
answer
Food preservative in .1% concentration
question
Blakeslee reports that a .1% concentration of sodium benzoate had a distinct taste to how many people?
answer
Over 25% of 250 people tested.
question
Which chemical in this study is believed to be detrimental to health?
answer
Sodium benzoate
question
Williams and Arthur L. Fox reports that tasters and nontasters of PTC can be subdivided into 5 subgroups depending on whether sodium benzoate tastes ____, ____, ____, ____, or ____.
answer
Salty, sweet, sour, bitter, or tasteless.
question
Which combination of PTC and sodium benzoate tastes did Fox not find when testing 1500 people?
answer
Tasteless PTC and bitter sodium benzoate
question
What were the top four PTC-sodium benzoate tastes in Fox's study?
answer
1. Bitter-salty 2. Bitter-sweet 3. Bitter-bitter 4. Tasteless-salty
question
Which PTC-sodium benzoate taste group finds controversial tasting foods (sauerkraut, buttermilk, etc.) more appetizing?
answer
Bitter-salty group
question
Which PTC-sodium benzoate taste group finds controversial tasting foods less appetizing?
answer
Bitter-bitter group
question
What substance consumed before GI tract x-rays also exhibits taste dimorphism?
answer
Barium sulfate emulsions
question
What may account for distinctive flavors different individuals notice in various meats?
answer
The presence of creatine that is bitter to some and tasteless to others.
question
Define dimorphism
answer
Existence of two different forms
question
What 5 substances were tested in this paper?
answer
Phenylthiocarbamide Thiocarbamide Sodium benzoate Barium sulfate Creatine
question
Which race has the smallest frequency of the recessive gene for tasting PTC?
answer
Indian
question
Which race has the largest frequency of the recessive gene for tasting PTC?
answer
Hindu
