A horticulturist is breeding a new variety of houseplant in which two genes control leaf color. G (allele for green) is dominant to g (yellow) and B (second allele for green) is dominant to b (yellow). The recessive homozygous condition of either gene will mask a dominant allele. What color is a plant with the genotype GgBb?
A. an intermediate yellow-green
B. yellow
C. variegated (yellow and green spots or stripes)
D. green
E. The color cannot be determined with the information given.
Answer: D
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Drugs can cross the blood-brain barrier only if they are
a) large-molecular-weight molecules. b) small-molecular-weight molecules. c) water-soluble. d) lipid-soluble.
Which of the following statements regarding blood pressure is false?
A) Normal blood pressure for adult humans is usually at or below 120/80. B) Hypertension is defined as persistent systolic pressure above 120 and/or diastolic above 80. C) High blood pressure can lead to an enlarged and weakened heart, increased risk of heart attack, stroke, and kidney failure. D) The higher number in a blood pressure reading measures the force of a heart contraction.
Infectious diseases can be classified on the basis of
A) severity and duration of the disease. B) means of transmission. C) organs or organ systems affected by the disease. D) type of microbe that causes the disease. E) disease severity and duration, organ system affected or type of microbe.
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