Ned is reading his newspaper by holding it at arm's length. Sandra asks him why he isn't holding it closer. He explains that he would not be able to see the print if he held it closer. Which of the following corrective measures would be the best solution
for Ned?
A) concave lenses B) convex lenses
C) corneal ring segments D) retinal transplants
Answer: B
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Class I biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet. b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet. c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet. d. are often called laminar flow hoods.
The most common cause of low sperm count in males is _____
a. varicocele b. undescended testicles
c. testicular failure d. semen disorders e. obstructions
The process by which cells become specialized from one another is called
A) differentiation. B) mitosis. C) pluripotency. D) meiotic specialization. E) cleavage.
Which of the following describes how the hygiene hypothesis is related to type I hypersensitivity reactions?
A) Up to 30 percent of people in undeveloped countries suffer from allergic rhinitis. B) Food allergies have increased 3-fold in chronically poor families as compared to wealthy families in the United States. C) Children living on a farm are 25 percent more likely to experience seasonal allergies than children living in a large city. D) Between 1997 and 2011, the incidence of food allergies in the United States increased by 50 percent. E) Wealthy individuals are 10 times more likely to experience anaphylactic shock as compared to someone raised in an orphanage during adolescences.