The hormone ____ is involved in a positive
feedback cycle that results in strong uterine
contractions during labor.
a. estrogen
b. oxytocin
c. cortisol
d. progesterone
e. prolactin
B
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If the map distance between genes A and B is 20 map units and the map distance between genes B and C is 35 map units, what is the map distance between genes A and C?
A) 15 map units B) 55 map units C) More information is needed to distinguish between 15 and 55 map units. D) Gene C must be located on a different nonhomologous chromosome.
The number of DNA molecules in a duplicated chromosome is
a. one. b. undetermined. c. half that of an unduplicated chromosome. d. two. e. four.
In Mendel's experiments, if the gene for tall (T1 ) plants was incompletely dominant over the gene for short (T2 ) plants, what would be the result of crossing two T1T2 plants?
A) 50% tall, 25% intermediate, and 25% short B) All the offspring would be tall. C) 25% tall, 50% intermediate, and 25% short D) 25% tall, 25% intermediate, and 50% short E) All the offspring would be intermediate.
A child is born with a rare disease in which mitochondria are missing from skeletal muscle cells. However, the muscles still function. Physicians find that the
A) muscles contain large amounts of lactate following even mild physical exercise. B) muscles contain large amounts of carbon dioxide following even mild physical exercise. C) muscles require extremely high levels of oxygen to function. D) muscle cells cannot split glucose to pyruvate.