PASS W1&2 Content

Which statement about the atomic number of an element is correct?

• It represents the number of neutrons in an atom.

• It is the total number of protons and neutrons in an atom.

• It represents the number of protons in an atom.

• It represents the number of valence electrons in an atom.

Which of the following best describes electronegativity?

• The ability of an atom to donate electrons.

• The energy required to remove an electron from an atom.

• The tendency of an atom to attract electrons in a chemical bond.

• The number of valence electrons in an atom.

Which property of water is most responsible for maintaining stable ocean temperatures?

• High surface tension

• High heat capacity

• Universal solvent property

• Low density of ice

Which of the following macromolecules is NOT a true polymer?

• Carbohydrates

• Proteins

• Lipids

• Nucleic acids

The difference between saturated and unsaturated fats is due to:

• The presence of peptide bonds

• The number of carbon atoms

• The presence of double bonds in fatty acid chains

• The number of phosphate groups

Which of the following describes the primary structure of a protein?

• A sequence of amino acids

• The folding of the polypeptide into α-helices and β-sheets

• The overall 3D shape of a single polypeptide chain

• The interaction of multiple polypeptides

Which of the following statements about enzymes is correct?

• They increase the activation energy of reactions.

• They change the overall Gibbs free energy of a reaction.

• They speed up reactions by stabilizing the transition state.

• They are permanently consumed during the reaction.

What kind of bond forms between nucleotides in a DNA strand?

• Peptide bond

• Glycosidic bond

• Phosphodiester bond

• Hydrogen bond

An exergonic reaction requires continuous energy input to proceed.

• True

• False

Which of the following factors affects enzyme activity?

• Temperature

• pH

• Substrate concentration

• All of the above