$$[H^+] = 1 \times 10$$^{-4}$$ \text{ M}$$

Question 1

Which of the following statements best explains why water has a high specific heat compared to other substances?

Accepted Answer

Water molecules form hydrogen bonds with each other, which absorb heat energy before breaking.

Question 2

A carbon atom has an atomic number of 6. How many protons, neutrons, and electrons does a neutral carbon atom typically have?

Accepted Answer

6 protons, 6 neutrons, 6 electrons

Question 3

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 4

Which formula correctly calculates the pH of a solution given the concentration of hydrogen ions $$[H^+]$$?

Accepted Answer

$$pH = -\log_{10} [H^+]$$

Question 5

Which of the following is a correct representation of a nucleotide found in DNA?

Accepted Answer

A phosphate group, a deoxyribose sugar, and a nitrogenous base

Question 6

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than liquid water because hydrogen bonds hold water molecules in a rigid lattice with more open space.

Question 7

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Storing genetic information

Question 8

Which of the following statements about RNA is TRUE?

Accepted Answer

RNA contains ribose instead of deoxyribose.

Question 9

Which of the following best describes a polymerization reaction?

Accepted Answer

A reaction that joins monomers together to form polymers, often releasing water.

Question 10

Which of the following is a secondary structure found in proteins?

Accepted Answer

Alpha helix

Question 11

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$this solution?

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ 	ext{ M}$$

Question 12

Which of the following is a property of water that makes it an excellent solvent for biological molecules?

Accepted Answer

Water can form hydrogen bonds with polar molecules and ions.

Question 13

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 14

Which of the following is a correct statement about enzymes?

Accepted Answer

Enzymes lower the activation energy required for a reaction.

Question 15

Which of the following is a correct representation of a peptide bond?

Accepted Answer

A bond formed between the carboxyl group of one amino acid and the amino group of another amino acid.

Question 16

Which of the following best describes a hydrophobic molecule?

Accepted Answer

A molecule that does not interact with water because it is nonpolar.

Question 17

Which of the following is a correct statement about the secondary structure of RNA?

Accepted Answer

RNA secondary structure can form hairpin loops due to base pairing within the same strand.

Question 18

Which of the following is a correct statement about the quaternary structure of proteins?

Accepted Answer

Quaternary structure is formed when two or more polypeptide chains interact to form a functional protein.

Question 19

Which of the following is a correct statement about condensation reactions?

Accepted Answer

Condensation reactions join monomers together to form polymers and release water.

Question 20

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA is a double helix with two antiparallel strands held together by hydrogen bonds between complementary bases.

General Biology: Atoms, Molecules, Water, Macromolecules, and Nucleic Acids

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