Q: If a solution has $$pH = 6$$, what is the $$[H^+]$$ concentration?

$$[H^+] = 1 \times 10$$^{-6}$$\ \mathrm{M}$$

Question 1

Which of the following is NOT a functional group commonly found in organic molecules?

Accepted Answer

Protein

Question 2

If two atoms with greatly differing electronegativities form a bond, what type of bond is most likely formed?

Accepted Answer

Polar

Question 3

Why is the water molecule ($$\mathrm{H_2O}) $$considered polar?

Accepted Answer

The hydrogen atoms are found on one side of the molecule and hydrogen is less electronegative than oxygen

Question 4

Which type of interaction is primarily responsible for the dissolution of ionic compounds in water?

Accepted Answer

Ion-dipole and dipole-dipole interactions

Question 5

Which of the following characteristics makes for a good hydrogen bond donor?

Accepted Answer

Both of the above

Question 6

What is the pOH of a $$0.04\ \mathrm{M}$$ solution of HCl?

Accepted Answer

$$pOH = 1.4$$

Question 7

If a solution has $$pH = 6$$, what is the $$[H^+]$$ concentration?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-6}$$\ \mathrm{M}$$

Question 8

The amino and carboxyl groups of amino acids are bonded to which carbon?

Accepted Answer

Both are bonded to the alpha-carbon

Question 9

Which group consists only of amino acids with polar side chains?

Accepted Answer

Serine, threonine, and cysteine

Question 10

Which statement about the relationship between the energy released during a reaction and the reaction rate is correct?

Accepted Answer

The amount of energy released tells nothing about the rate at which the reaction will occur

Question 11

What does 'amphiphatic' mean in the context of biomolecules?

Accepted Answer

Having both hydrophilic and hydrophobic regions

Question 12

Why do biochemists use a modified value for $$\Delta G ($$Gibbs free energy change) in biological systems?

Accepted Answer

All of the above

Question 13

By definition, a spontaneous reaction is one in which:

Accepted Answer

The reaction occurs without input of energy from the surroundings

Question 14

The production of larger molecules from smaller ones is called:

Accepted Answer

Anabolism

Question 15

Which of the following best describes an oxidizing agent in a chemical reaction?

Accepted Answer

Gains oxygen

Question 16

You are preparing a buffer solution with a desired $$pH of$$ $$6.7. $$The phosphate buffer system has a $$pK_a of$$ $$7.2. $$Using the Henderson-Hasselbalch equation, can you use this buffer system effectively?

Accepted Answer

Yes, because the desired pH is within one unit of the $$pK_a$$

Question 17

Which of the following is a correct application of the Henderson-Hasselbalch equation for a buffer with $$pK_a = 4.76$$ and $$[A^-]/[HA] = 10$$?

Accepted Answer

$$pH = 4.76 + \log_{10}(10) = 5.76$$

Question 18

Which of the following is a way that biochemical pathways can compensate for nonspontaneous reactions?

Accepted Answer

Coupling the reaction to ATP hydrolysis

Question 19

Which of the following amino acids is classified as nonpolar?

Accepted Answer

Valine

Question 20

A dipeptide is formed between alanine and valine. Which type of bond connects the two amino acids?

Accepted Answer

Peptide bond

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