Atomic nuclei contain protons and ________.
A. neutrons
B. isomers
C. ions
D. moles
Answer: A
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Explain how insects are both essential for, and detrimental to agriculture What will be an ideal response?
Resource partitioning can often be seen in similar species that occupy the same geographic area. These species avoid competition by living in different portions of the habitat or by utilizing different food or other resources and are called ________ species.
A. fundamental B. allopatric C. sympatric D. exploitative E. competitive
You have a substance and begin a set of experiments in which you break it down into other substances through chemical reactions. After a few successive reactions, you discover a set of products that can't be broken down further, no matter what type of
chemical reaction you attempt. These substances are: A) elements. B) neutrons. C) isotopes. D) protons. E) electrons.
Which of the following is normally found at the 5' end of a DNA strand?
A. a phosphate group B. a hydrogen bond C. a hydroxyl group D. histones E. a methyl group