What is the name of the syndrome that produces the XXY combination of sex chromosomes?
A. Klinefelter syndrome
B. Down syndrome
C. Turner syndrome
D. Jacob's syndrome
Answer: A
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Males of many moth species have very large and elaborate antennae. These large antennae
A. enhance sensitivity for finding rotting food. B. enhance sensitivity for finding flowers in bloom. C. enhance sensitivity to sexual pheromones from females. D. enhance sensitivity to compounds emitted by other males that are important in sexual competition. E. serve an important aerodynamic function during flight.
A fragment of DNA or RNA labeled with a tracer that can hybridize with a nucleotide sequence of interest is referred
to as a ____.
a. clone b. plasmid c. vector d. marker e. probe
Pathogens enter the skin through which means?
a. bites of other organisms b. diffusion across the stratum corneum c. breaks in the skin d. digestive enzymes creating passage
Which of the following statements is correct?
(A) At 10 mm Hg partial pressure, hemoglobin binds oxygen but myoglobin does not. (B) At 20 mm Hg partial pressure, myoglobin and hemoglobin bind oxygen in equal amounts. (C) At 40 mm Hg partial pressure, myoglobin has a greater affinity for oxygen than hemoglobin has. (D) At 80 mm Hg partial pressure, myoglobin binds twice as much oxygen as hemoglobin binds.