BIOL

When we say that the cell is the fundamental unit of life, we mean that: - the smallest entity that can be considered living is a cell. - all living things are made up of one or more cells. - life doesn't exist in the absence of cells. - a single cell can carry out all life processes. - all of these choices are correct.

- all of these choices are correct.

Which of the examples are cellular life forms: virus, yeast, bacteria, plant, animal? - All of these choices are correct. - All are cellular except bacteria. - All are cellular except yeast. - Only plants and animals are cellular. - All are cellular except viruses.

All are cellular except viruses.

Decide which molecule is held together by nonpolar covalent bonds? NH3 H2O CO2 KCl

CO2

A mutation in _____ results in a change in _____ that sometimes produces a(n) _____ with altered structure and function. protein; DNA; RNA RNA; DNA; protein DNA; RNA; protein RNA; protein; DNA protein; RNA; DNA

DNA; RNA; protein

At some point in their life cycle, all cells have a _____, whereas not all cells have a(n) _____. - plasma membrane; RNA or DNA - plasma membrane; nuclear membrane - nucleus; cytoplasm - nucleus; plasma membrane - nucleus; nuclear membrane

plasma membrane; nuclear membrane

Which choice correctly pairs the particles in an atom with its electrical charge? -proton-negatively charged; neutron-uncharged; electron-negatively charged - proton-positively charged; neutron-negatively charged; electron-negatively charged - proton-uncharged; neutron-uncharged; electron-negatively charged - proton-positively charged; neutron-uncharged; electron-negatively charged

proton-positively charged; neutron-uncharged; electron-negatively charged

Which choice is an example of a hydrogen bond? -the bond that forms between two hydrogen atoms within the same water molecule -the bond that forms between a hydrogen and oxygen atom within the same water molecule -the bond that forms between two hydrogen atoms within different water molecules -the bond that forms between a hydrogen atom in one water molecule and an oxygen atom in another water molecule -the bond that forms between two oxygen atoms within different water molecules

the bond that forms between a hydrogen atom in one water molecule and an oxygen atom in another water molecule

A polar covalent bond is due to: -unequal sharing of electrons in a covalent bond. -the interaction between an ion and a non-ionic atom. -equal sharing of valence electrons. -an attraction of opposite charges.

unequal sharing of electrons in a covalent bond.

One of your friends is arguing that viruses are alive. What information would you provide to convince him that viruses can't be considered alive? - Viruses cannot carry out metabolic reactions on their own. - Viruses are much more closely related to archaeons than bacteria. - Viruses contain either RNA or DNA but not both. - Viruses typically have protein coats and no plasma membrane.

Viruses cannot carry out metabolic reactions on their own.

A molecule of common table salt, or NaCl, is the result of ______ bond forming between a sodium (Na) atom and a chlorine (Cl) atom. an ionic a covalent a polar covalent either an ionic or a polar covalent a hydrogen

an ionic

A researcher has measured the pH of a solution and found that the pH is 10. This solution is ______ and has more ______ compared to ______. -basic; protons; hydroxide ions -acidic; protons; hydroxide ions -neutral; hydroxide ions; protons -acidic; hydroxide ions; protons -basic; hydroxide ions; protons

basic; hydroxide ions; protons

Of the given types of bonds between atoms, which is the strongest? van der Waals forces hydrogen bond covalent bond ionic bond

covalent bond

Which component of an atom has the smallest mass? - proton - neutron - isomer - isotope - electron

electron

The ability of atoms to attract electrons is referred to as: van der Waals attraction. potential energy. electronegativity. hydrophobicity. cohesion.

electronegativity

Water readily dissolves compounds that are referred to as _____. solvent hydrophobic aqueous hydrophilic nonpolar

hydrophilic

A ______ substance could contain ______ bonds which cause it not to interact with water. - hydrophobic; hydrogen -hydrophobic; nonpolar covalent -hydrophilic; hydrogen -hydrophilic; polar covalent -hydrophilic; nonpolar covalent

hydrophobic; nonpolar covalent

The chemical reactions required to sustain life are collectively referred to as a cell's: anatomy. physiology. All of the choices are correct. genetics. metabolism.

metabolism

Two elements within the same group: - occupy the same column on the periodic table and have the same number of electrons in their outermost shell. - have the same number of shells. - occupy the same row on the periodic table of elements. - occupy the same column on the periodic table of elements but have different numbers of electrons in their outermost shell. - have different numbers of electrons in their outermost shell.

occupy the same column on the periodic table and have the same number of electrons in their outermost shell.

Imagine you are looking at a bottle of salad dressing containing oil, vinegar, and water. You notice that the oil sits on "top" of the other liquids. This is due, in part, to the fact that: -water is hydrophobic. -oil is hydrophobic. -oil is hydrophilic. -water is hydrophobic and oil is hydrophilic. -vinegar is hydrophobic.

oil is hydrophobic.

The structural formula for hydrogen gas (H2) is represented as H-H. The dash (-) represents a(n): product. chemical bond. chemical reaction. electronegative bond. reactant.

chemical bond.