ch1and2test - Which of the following statements is true of...

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Which of the following statements is true of amino acids? Selected Answer: c. All statements are true. Question 2 0 out of 2 points An atom can be changed into an ion by adding or removing: Selected Answer: d. an isotope. Question 3 2 out of 2 points Patients of Phenylketonuria cannot break down: Selected Answer: e. amino acid Question 4 2 out of 2 points One of the four nucleotide bases in DNA is replaced by a different base in RNA. Which base is it, and what is it replaced by? Selected Answer: c. thymine, replaced by uracil Question 5 2 out of 2 points DNA is made of: Selected Answer: e. nucleotides
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Question 6 2 out of 2 points A buffer is a chemical that: Selected Answer: b. can quickly absorb H+ ions to keep a solution from becoming too acidic and quickly release H+ ions to counteract any increase in the OH- concentration in a solution. Question 7 0 out of 2 points pH of urine is -------- which is -----------. Selected Answer: c. 7.00, neutral Question 8 0 out of 2 points Enzymes: Selected Answer: a. sometimes increase the amount of energy necessary to initiate a reaction. Question 9 2 out of 2 points The four most abundant elements in living organisms are: Selected Answer: b. hydrogen, nitrogen, oxygen, and carbon. Question 10
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2 out of 2 points Which of the following is a polysaccharide? Selected Answer: d. cellulose Question 11 2 out of 2 points The most abundant molecule in the cell is: Selected Answer: e. water Question 12 2 out of 2 points Which of the following elements have four electrons in their outer shells? Selected Answer: e. carbon and silicon Question 13 2 out of 2 points A solution’s acidity is: Selected Answer: a. a measure of H+ (free floating protons) in a solution. Question 14 2 out of 2 points The pH of a fluid is a measure of: Selected Answer: a.
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how acidic or basic it is. Question 15 2 out of 2 points Glucose that circulates in your blood has one of three fates: it is used to fuel cellular activities, it can be convertesed into fat, or it can ---------------.
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