The unequal sharing of electrons within a water molecule makes the water molecule _________
a) have a low surface tension
b) ionic
c) hydrophobic
d) polar
e) change easily from a liquid to gaseous form
polar
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A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light. B. Auxin absorbs mostly far-red light. C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. Shade is enriched in far-red wavelengths of light.
Arrange the structures that control cardiac output in the correct order
a. baroreceptors ? brain stem ? autonomic nervous system ? heart b. baroreceptors ? heart ? brain stem ? autonomic nervous system c. brain stem ? baroreceptors ? autonomic nervous system ? heart d. autonomic nervous system ? brain stem ? heart ? baroreceptors e. heart ? baroreceptors ? autonomic nervous system ? brain stem
Human infestation with Taenia saginata results from ingesting ________ in undercooked intermediate host
A) scolex B) cysticerci C) proglottids D) eggs E) cysts