QUESTION: 349

Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to disqualify up to 5 percent of all prospective blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. Therefore, about 10 percent of actual donors will still supply NANB-contaminated blood.
Which of the following inferences about the consequences of instituting the new tests is best supported by the passage above?

The incidence of new cases of NANB hepatitis is likely to go up by 10 percent.
Donations made by patients specifically for their own use are likely to become less frequent.
The demand for blood from blood banks is likely to fluctuate more strongly.
The blood supplies available from blood banks are likely to go down.
The number of prospective first-time donors is likely to go up by 5 percent.

Answer(s): D

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QUESTION: 350

Child’s World, a chain of toy stores, has relied on a “supermarket concept” of computerized inventory control and customer self-service to eliminate the category of sales clerks from its force of employees. It now plans to employ the same concept in selling children’s clothes.
The plan of Child’s World assumes that

supermarkets will not also be selling children’s clothes in the same manner
personal service by sales personnel is not required for selling children’s clothes successfully
the same kind of computers will be used in inventory control for both clothes and toys at Child’s World
a self-service plan cannot be employed without computerized inventory control
sales clerks are the only employees of Child’s World who could be assigned tasks related to inventory control

Answer(s): B

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QUESTION: 351

Continuous indoor fluorescent light benefits the health of hamsters with inherited heart disease. A group of them exposed to continuous fluorescent light survived twenty-five percent longer than a similar group exposed instead to equal periods of indoor fluorescent light and of darkness.
The method of the research described above is most likely to be applicable in addressing which of the following questions?

Can industrial workers who need to see their work do so better by sunlight or by fluorescent light?
Can hospital lighting be improved to promote the recovery of patients?
How do deep-sea fish survive in total darkness?
What are the inherited illnesses to which hamsters are subject?
Are there plants that require specific periods of darkness in order to bloom?

Answer(s): B

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QUESTION: 352

Millions of identical copies of a plant can be produced using new tissue-culture and cloning techniques. If plant propagation by such methods in laboratories proves economical, each of the following, if true, represents a benefit of the new techniques to farmers EXCEPT:

The techniques allow the development of superior strains to take place more rapidly, requiring fewer generations of plants grown to maturity.
It is less difficult to care for plants that will grow at rates that do not vary widely.
Plant diseases and pests, once they take hold, spread more rapidly among genetically uniform plants than among those with genetic variations.
Mechanical harvesting of crops is less difficult if plants are more uniform in size.
Special genetic traits can more easily be introduced into plant strains with the use of the new techniques.

Answer(s): C

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QUESTION: 349

QUESTION: 350

QUESTION: 351

QUESTION: 352