The major nerve that controls inspiratory activity is the ____
a. vagus nerve
b. phrenic nerve
c. intercostal nerve
d. brain stem nerve
e. pace maker nerve
ANSWER: b
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Hemophilia is a group of different inherited blood-clotting disorders. Which is true about hemophilia?
A. It causes sterility. B. It is more common in males than in females. C. It is inherited only on the autosomes. D. It is more common in females than in males.
The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of
reproductive isolating mechanism? a. behavioral isolation b. mechanical isolation c. gametic isolation d. temporal isolation e. hybrid breakdown
Uranium is a metallic element that is used in nuclear reactors and nuclear weapons. The vast majority of uranium found on Earth is in the form of uranium-238, an isotope with a mass number of 238, while the uranium that is used for nuclear reactors and weapons is uranium-235, an isotope with a mass number of 235. What is the atomic difference between uranium-235 and uranium-238?
A. uranium-235 has three fewer protons than uranium-238 B. uranium-235 has three fewer neutrons than uranium-238. C. uranium-235 has three fewer electrons than uranium-238. D. uranium-235 has three fewer atoms than uranium-238.
In seed plants, __________ allow reproduction without standing water.
Fill in the blank(s) with the appropriate word(s).