Biology 2007 - Merck State Science Day 2007 Biology...

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Merck State Science Day 2007 Biology 1 Merck State Science Day 2007 Biology Multiple Choice Identify the letter of the choice that best completes the statement or answers the question and place your selection ON THE ANSWER SHEET. 1. Carbon-14 is often used for carbon dating, where scientists measure the rate of caron-14 decay to determine the age of items. It contains six protons and eight neutrons. During the process of carbon-14 decay, one of its eight neutrons becomes a proton and an electron is emitted. Which of the following is the BEST explanation of what has occurred? A) An ionic bond has formed. B) The resulting atom is still carbon-14 C) The resulting atom still has an unstable nucleus D) The resulting atom is now a different element because the number of protons has changed. 2. The numbers listed represent the first, second, and third energy levels, respectively. On the basis, which of the following is an unstable or reactive atom? A) 2 B) 2,8,8 C) 2,8 D) 2,8,1 3. A pharmaceutical company hires a chemist to analyze the purity of the water being used in its drug preparations. If the water is pure, the chemist would expect to find A) only H + ions and OH - ions B) H 2 O molecules and H + ions. C) H 2 O molecules and OH - ions. D) Only molecules of H 2 O. E) H 2 O molecules, H + ions, and OH - ions. 4. Which of the following best describes the relationship between the atoms described below? Atom1 Atom 2 1 3 1 H 1 H A) They are polymers B) They are isotopes C) They each contain 1 neutron D) They contain 1 and 3 protons, respectively E) They are isomers 5. What do the four elements most abundant in life ? carbon, oxygen, hydrogen, and nitrogen ? have in common? A) They are elements produced only by living cells. B) Each element exists in only one isotopic form C) They are equal in electronegativity D) They all have the same number of valence electrons E) They all have unpaired electrons in their valence shells 6. Which is the best description of a carbonyl group? A) a carbon joined to two hydrogens by single covalent bonds B) an oxygen joined to a carbon by a single covalent bond C) a nitrogen and two hydrogens joined to a carbon by covalent bonds D) a sulfur and a hydrogen joined to a carbon by covalent bonds E) a carbon atom joined to an oxygen by a double covalent bond
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Merck State Science Day 2007 Biology 2 7. A chemist wishes to make an organic molecule less acidic. Which of the following functional groups should be added to the molecule in order to do so? A) phosphate B) carboxyl C) hydroxyl D) sulfahydryl E) amino 8. Select which reactions will usually be irreversible regarding chemical equilibrium in living systems. A) complete glucose decomposition B) H2O + CO2 to make H2CO3 C) ADP + Pi to make ATP D) glucose molecules joined to make glycogen 9. The R group or side chain of the amino acid serine is CH 2 - OH. The R group or side chain of the amino acid alanine is –CH 3 . Where would you expect to find these amino acids in a globular protein in
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Biology 2007 - Merck State Science Day 2007 Biology...

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