Asthma is caused by
A. contraction of the bronchioles.
B. reduced number of alveoli.
C. lack of hemoglobin in the blood.
D. reduced flow of blood to the lungs.
A. contraction of the bronchioles.
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Johann Gregor Mendel’s work in genetics focused on traits that exhibit discontinuous variation. What kind of traits are these?
a. traits that are inherited in distinct patterns easily distinguishable among phenotypes b. traits that are controlled by many genes that each participate in subtle ways to produce a range of phenotypes c. traits that are controlled by individual genes that are “tempered” by neighboring genes to produce a range of phenotypes d. traits that are located physically close to each other on the same chromosome
Which bone is frequently broken when someone dies of deliberate strangulation?
A) floating ribs B) maxilla C) cervical vertebrae D) hyoid bone E) mandible
The energy released in the mitochondrial electron transport chain is used to transport protons into the
A. mitochondrial matrix. B. cytoplasm. C. nucleus. D. endoplasmic reticulum. E. intermembrane space of the mitochondria.
About how often have catastrophic destructions of the magnitude of the end-Cretaceous bolide impact occurred?
A) at intervals of a billion years B) at intervals of 10 to 100 million years C) at intervals of 10 to 100 thousand years D) only once