How many varieties of apples account for 90% of the apples sold in U.S. grocery stores today?
a. 5
b. 15
c. 25
d. 50
e. 150
ANSWER: b
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Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Deirdre's phenotype?
A. Normal B. nn C. Albino D. Cannot be determined
What important metabolic intermediate does not cross the inner membrane of the mitochondria?
A. ATP B. Acetyl-CoA C. Pyruvate D. Oxygen
During a blood transfusion, what can occur when the antigens on the blood cells of a blood donor interact with the antibodies that are present in the plasma of a recipient that has a different blood type?
A. an autoimmune reaction B. an infection C. an agglutination reaction D. an inflammatory reaction E. a temperature response
Pathogens that enter through the gastrointestinal tract are adapted to survive ____ and ____
Fill in the blank(s) with the appropriate word(s).