The partial pressure of oxygen in the lungs causes it to load into the circulatory system.
a. true
b. false
Ans: a. true
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________ and ________ are the two kinds of sugars found in bacterial cell walls.
Fill in the blank(s) with the appropriate word(s).
The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but their mating calls sound very different. Based on this, what is the best explanation for why these frogs are considered separate species?
A. They are too morphologically different to interbreed. B. They have undergone behavioral isolation which prevents them from interbreeding. C. They have undergone habitat isolation because one species is entirely terrestrial while the other is entirely aquatic. D. They do interbreed, but produce sterile hybrids.
Lysogenic bacteriophages contribute to bacterial virulence because bacteriophages
A) give new gene sequences to the host bacteria. B) produce toxins. C) carry plasmids. D) kill the bacteria, causing release of endotoxins. E) kill human cells.
Sequences of DNA that are identical when read from the 5' to 3' direction on one strand and the 3' to 5' direction on the other strand are
A. restriction endonucleases. B. DNA polymerases. C. ligases. D. reverse transcriptases. E. palindromes.