Jeckel ERS #1 - Fa24

What is the difference between the atomic number and the mass number of an atom?

• The atomic number is the total number of protons and neutrons, while the mass number is the number of protons only.

• The atomic number is the number of protons in an atom, while the mass number is the sum of protons and neutrons.

• The atomic number is the sum of electrons and neutrons, while the mass number is the number of protons only.

• The atomic number is the total number of electrons and neutrons, while the mass number is the number of protons and neutrons.

Which of the following best describes an unsaturated fat?

• It contains only single bonds between carbon atoms.

• It has no carbon-carbon bonds.

• It is solid at room temperature.

• It contains one or more double bonds between carbon atoms.

In __________, water is used to break a polymer apart, while in __________, water is removed to build a polymer.

• Hydrolysis; dehydration synthesis

• Dehydration synthesis; hydrolysis

• Condensation; hydrolysis

• Hydrolysis; condensation

What is the secondary structure of a protein primarily made of?

• Disulfide bonds forming a rigid backbone.

• Alpha helices and beta sheets, due to hydrogen bonds.

• Peptide bonds forming a long polypeptide chain.

• Hydrophobic interactions between amino acids.

How do hydrogen bonds form between two polar molecules?

• Through the sharing of electrons between atoms.

• Through the exchange of electrons between two atoms.

• Between a hydrogen atom of one molecule and an electronegative atom of another molecule.

• By the attraction of nonpolar molecules to each other.

Which cellular organelle is primarily responsible for storing genetic information?

• Mitochondrion

• Endoplasmic reticulum

• Nucleus

• Golgi apparatus

The mitochondria is responsible for:

• Producing energy for the cell.

• Storing genetic information.

• Synthesizing proteins.

• Digesting cellular waste.

A substance with a high concentration of H⁺ ions is considered __________, while a substance with a high concentration of OH⁻ ions is considered __________.

• Basic; neutral

• Basic; acidic

• Neutral; acidic

• Acidic; basic

• Neutral; basic

Which of the following statements about ions is true?

• A cation is formed when an atom loses an electron, an anion is formed when an atom gains an electron

• A cation is formed when an atom gains an electron, an anion is formed when a atom loses an electron

• A cation is formed when an atom gains a proton, an anion is formed when an atom gains a electron

• Cations and anions are not formed based on the amount of electrons an atom has.

Where are nucleic acids found?

• Oil

• Enzymes

• Starch

• DNA/RNA