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Food Science Exam 3
exam
65
Agriculture
Undergraduate 3
04/05/2011

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Cards

Term
Which statement is true?
Definition
Tg' temperature range can help predict food storage life and stability foods
Term
Which mechanism are responsible for hear transfer in foods?
Definition
Radiation, Conduction, and convection
Term
What is true regarding boundary layers in frying foods?
Definition
Movement of heat boundary layers partition (separate) the core from crust regions
Term
At hot soup placed in storage at 5degrees celcius in the steady state
Definition
will cool down to about 15degrees F
Term
Which thermal events occur during the drying of a potato slice in hot oil?
Definition
Denaturation of protein
Term
The movement or migration of frying oil caused by concentration gradients is called
Definition
Mass transfer
Term
Palm oil is a plant oil containing saturated, monounsaturated, and polyunsaturated fatty acids. What is true about its microstructure?
Definition
Consist of a 3-dimensional network, and it is related to the oil's macrostructure
Term
In the manufacture of tomato ketchup, which unit operation does not correspong to the microstructural level?
Definition
cleaning
Term
The key microstructural elements in ice cream are
Definition
Lactose, casein, ice, air, and fat
Term
A food scietist studying the effects of formulation and processing on the problem of ketchup viscosity is working in the area of
Definition
Rheology
Term
An ______ is a device that uses rotating screw technology within a barrel and has the ability to cook and shape foods
Definition
extruder
Term
_______ show continuous deformation at a rate proportional to the amount of stress applied
Definition
plastic solids
Term
Which statement is false?
Definition
Generally, it is undesirable to maintain a food in the rubbery state during extended storage
Term
Peanut butter and process cheese are examples of structured fluids, which statement below is false?
Definition
these products are unstable food systems
Term
Which of the following statements is incorrect?
Definition
It is not possible to determine vapor pressure using the psychometric chart
Term
The formula to calculate food viscosity is where mu=viscosity AP= measured pressure difference, pi= 3.14 R= radius of a measuring device, L= tube length and V= flow rate in the tube. Consider 2 fluids foods, A and B. The AP value of A is twice that of B. In measuring their viscosities mi, what makes the most sense?
Definition
Viscosity of A is double that of B
Term
What is the juction between any 2 air property lines?
Definition
state point
Term
Which is not a dielectric food property?
Definition
q
Term
When a potato slice is placed in a hot frying oil
Definition
oil uptake into the potato is through mass transfer
Term
A metal shelf in a refrigerated storage area feels colder than the frozen vegetables resting upon it, although both are at thermal equilibrium. why?
Definition
Metals have a high thermal conductivities
Term
Consider 2 brands of ketchup, A and B. You work for the manufacturer of brand B, and are performing rheological testing of A, which is the current top selling brand and comparing it to your company brand B. Upon analysis of brands A and B using identical test conditions and given the viscosity equation, the V parameter for brand A is found to be a factor of 10 higher than the V value of brand B. Whar recomendation should you make to the company management?
Definition
Recommend decreasing the viscosity of B through formulation and/or processing modification
Term
Which of the followings would not be useful in determining the % RH if given a dry bulb temperature of 50F?
Definition
locate the vertical line that represents the 50F wet bulb temperature
Term
In designing a transport system for a semifluid food manufactured in a processing facility, such as a popeline to pump the product from a bulk container into specific processing equipment, which is a product consideration rather thana a process consideration that enters into the design?
Definition
Anbient temperature in the processing facility
Term
The mating of an offpring with its parent is known in plant breeding as
Definition
backcrossing
Term
The term transgenic refers to plants or animals that are
Definition
modified by genetic engineering
Term
This gene is one that is inserted in reverse
Definition
antisense
Term
Genetic engineering is defined as
Definition
the manipulation of genes
Term
____ enzymes used to cut DNA in genetic engineering
Definition
restriction
Term
The use of an electric field to insert DNA into cells is
Definition
electroporation
Term
Genes that code for a recognizable product, such as antibiotic resistance, are ___ genes
Definition
marker
Term
The letters PCR stand for
Definition
Polymerase chain reaction
Term
Bacterial reactors used for mass production of specific producs are called?
Definition
fermentors
Term
The infection of plant tissue with A. rhyzogenes is
Definition
hairy root culture
Term
cloning is defined as the splitting of an embryo into ___ cells
Definition
8
Term
comparison of genetically modified foods with standard foods is called
Definition
substantial equivalence
Term
The appropiate food that bioengineered foods are compared to are
Definition
comparators
Term
__________ is an organism known to produce a natural herbicide
Definition
B. thuringiensis
Term
The enzyme _____ breaks down fungus cell walls
Definition
chitinase
Term
Trehalose sequesters ____ from cells
Definition
water
Term
the enzyme responsible for softening in tomatoes is
Definition
polygalacturonase
Term
fruits produce the following compound, which aids in the ripening process
Definition
ethylene
Term
Thaumatin is a natural __
Definition
sweetener
Term
Live cultures of bacteria that aid in food digestion are known as
Definition
probiotics
Term
Which is a characteristic of supertasters?
Definition
often have strong food dislikes
Term
The main applications of sensory evaluation in the food industry are
Definition
in quality assurance and product development
Term
The sensory attributes that define a food's appearance, flavor, texture, and aroma are
Definition
character notes
Term
These cells function to detect taste stimuli as well as transfer taste information to the brain
Definition
Taste receptor cells
Term
Flavor combines all of the following exept
Definition
appearance
Term
Which mechanical texture characteristic refers to the degree to which a food deforms or compresses between the teeth before breaking?
Definition
cohesiveness
Term
Which one is not a geometrical food characteristic?
Definition
adhesive
Term
What negative result occurs if a sensory panelist is presented with too many samples?
Definition
sensory fatigue
Term
Which statement is not true regarding line extensions?
Definition
require the same amount of time and money to develop as totally new products
Term
What is the meaning of tristimulus?
Definition
three color dimensions
Term
Which pairing is incorrect?
Definition
Crackle, volatile flavors
Term
Which panelist selection and training criterion should not be applied to all sensory test situations?
Definition
socioeconomic level and cultural background
Term
In this form of sensory test, the mechanical, geometrical, fat and moisture, and afterfeel characteristics of food are described and quantified
Definition
texture profiling
Term
Which corresponds most to affective testing?
Definition
Hedonic/acceptance/preference
Term
What is ANN, and what key advantage does it offer?
Definition
artificial neural network; time savings
Term
To maintain profits, a successful food company
Definition
considers the uncertainty of the future
Term
Which generally is not associated with a food product's life cycle?
Definition
high advertising expense during decline phase
Term
Suppose you are working as a product development scientist. Your company is committed to developing a high soy isoflavone beverage/ The question "Where should the product be test marketed?" addresses which activity stage in product development?
Definition
commercial stage
Term
Given: the individual probabilities for success of a food product are A-B(0.9) B-C(0.8) C-D(0.9) what is the correct conclusion?
Definition
the probability of product success is about 52%
Term
Which pairing is incorrect?
Definition
caffeine, saccharin
Term
The hunter color data for a light green vegetable would have that are _____ compared to a dark green vegerable
Definition
higher in L
Term
Which does not apply to the triangle test?
Definition
One of the sample presentation orders is AAA
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