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Biology

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• Question 1

  0.5 out of 0.5 points

  	A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) _____.

• Question 2

  0.5 out of 0.5 points

  	Which of the following is a trace element required by humans?

• Question 3

  0.5 out of 0.5 points

  	Changing the number of _____ would change an atom into an atom of a different element.

• Question 5

• 0.5 out of 0.5 points

  	The atoms of different carbon isotopes _____.

• Question 6

  0.5 out of 0.5 points

  	How an atom behaves chemically when it comes into contact with other atoms is determined by its _____.

• Question 7

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  	Which of the following is important for biological molecules?

• Question 8

  0.5 out of 0.5 points

  	A covalent bond is formed when _____.

• Question 9

  0.5 out of 0.5 points

  	Hydrogen bonding is most often seen _____.

• Question 10

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  	Chemical equilibrium is reached when _______.