BIO 150 chapter 2

Consider the reaction AB → A + B. What is the product of this reaction?

- A - B F - AB T - A and B - A, B, and AB

Which of the following is incorrectly matched?

- Acid: Release hydrogen ions (H+) in an aqueous solution - pH: Measure of the acidity or basicity of a solution - Salt: Formed by the combination of hydrogen ions (H+) and hydroxide ions (OH-) - Base: Release hydroxide ions (OH-) in an aqueous solution - Water: Is the solvent in aqueous solutions

Choose the mismatched pairing(s). To be marked correct, you'll need to select all mismatched statements, as there may be more than one correct answer.

- Amphipathic molecules: Found in plasma membranes - Hydrophobic molecules: Polar - Hydrophilic molecules: Interact with water - Hydrophilic: Oil

A feature of many of the isotopes that are used in the field of medicine is that the isotopes are radioactive. What does this mean?

- Cationic forms of the atom are used.Anionic forms of the atoms are used. - The same number of atoms are arranged into different molecular structures. - The atoms with the greatest atomic mass are used. T - The nucleus of the isotope is unstable and breaks down over time.

______are molecules made up of more than one type of element.

- Compounds - Isotopes - Cations - Isomers

___________ are usually found in an atom's outermost shell and tend to participate in chemical reactions.

- Shared electrons T - Valence electrons - Neutral neutrons - Reactive protons

Choose the true statement(s) about polar covalent bonds. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

- These types of bonds commonly involve highly electronegative atoms, like hydrogen. T - Atoms within a molecule may take on a charge due to the unequal sharing of electrons. - The presence of dipoles in polar molecules lay the foundation for ionic bonds. T - These types of bonds generate dipoles.

Which reaction has X and Y as reactants?

- XY + W → WY + X -XY → X + Y T -X + Y → XY - X + YZ → Y + XZ - XY + AB → XB + AY

In a polar covalent bond,

- electrons are transferred from one atom to another. - electrons are shared unequally between more than two atoms. - electrons are shared unequally between two atoms. - an acid and a base neutralize each other to form a salt. - electrons are shared equally between two atoms.

Which of the following is not one of the four main groups of biomolecules?

- proteins - electrolytes - nucleic acids - lipids - carbohydrates

Isotopes are atoms of the same element that differ in

- the number of protons found in the nucleus. - the number of electrons orbiting the nucleus. - the number of protons and neutrons found in the nucleus. T - the number of neutrons found in the nucleus. - the number of protons and electrons found in the atom.

_____________ are atoms with the same number of protons but a different number of neutrons.

-Compounds - Ions T - Isotopes - Molecules

Which statement is true about carbohydrates?

A) They maybe saturated or unsaturated. B) They are a component of the cell wall of different types of organisms. C) They have primary, secondary, tertiary, and quaternary structure. D) They are usually hydrophobic. E) They consist of simple sugars which contain carbon, hydrogen, and oxygen in a 2: 1: 2 ratio.

Which particle is described incorrectly?

Neutron: Found in the nucleus and 1 atomic mass unit Electron: Found in shells orbiting the nucleus Proton: Found in shells orbiting the nucleus Proton: Positively charged and 1 atomic mass unit Electron: Negatively charged and negligible mass

Select the true statement(s) about ionic bonds. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

T - An ionic bond is an electrostatic force that exists between cations and anions. - Ionic bonds are required to form polar molecules. - The atoms of ionic compounds only exist as ions in a solution. T - An ionic bond requires the transfer of electrons from one atom to another.

Choose the false statement(s) about acids and bases. To be marked correct, you'll need to select all false statements, as there may be more than one correct answer.

T - Bases release OH- ions in an aqueous solution. T - Acids contribute H+ ions to an aqueous solution. F - Pure water has more H+ ions than OH- ions. F - If an acid is added to an acidic solution, the pH will increase.

Select all of the true statements regarding biomolecules and their building block monomers. To be marked correct, you'll need to select all true statements, as there may be more than one correct answer.

T - Carbohydrates are built from monosaccharides. - Nucleotides are built from nucleic acids. T - Proteins are built from amino acids. - Fatty acids are built from glycerol.

Choose the mismatched pairing(s). To be marked correct, you'll need to select all mismatched statements, as there may be more than one correct answer.

T: Synthesis reaction: A + B → AB F: Dehydration synthesis: A + BC → AC + B T: Decomposition reaction: AB → A + B T: Hydrolysis reaction: AB + H2O → A + B

A cation forms when an atom loses one or more negatively-charged electrons.

True

An atom is best described as

always containing an equal number of protons and neutrons. F: defined by its atomic mass. T: the smallest unit of an element. T: The nucleus of an atom contains neutrons. having a nucleus containing protons and electrons. defined by its number of electrons.