Principles of Bio Chap. 2-5 (Part One)

What is the correct order for the hierarchy of biological organization from the least to the most complex?

• molecule, organelle, cell, tissue, organ, organism, population, community, ecosystem, biosphere

• molecule, organelle, cell, tissue, organ, organism, population, ecosystem, community, biosphere

• molecule, organelle, cell, tissue, organ, organism, ecosystem, community, population, biosphere

• molecule, organelle, tissue, cell, organ, organism, population, community, ecosystem, biosphere

A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) __________.

• element

• proton

• isotope

• compound

• molecule

Which of the following subatomic particles always has a positive charge?

• electron

• neutron

• atom

• proton

The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by __________.

• the size of the atom: smaller atoms are chemically more reactive

• the number of protons

• the number of neutrons

• the number of unpaired electrons in the valence shell

A carbon atom and a hydrogen atom form what type of bond in a molecule?

• nonpolar covalent bond

• ionic bond

• polar covalent bond

• hydrogen bond

An ionic bond is formed when __________.

• both atoms are nonpolar

• atoms are subjected to radioactive isotopes

• one atom transfers an electron to another atom

• both atoms are electrically neutral

one atom transfers an electron to another atom

• nonpolar covalent bonds

• hydrogen bonds

• Van der Waals interactions

• polar covalent bonds

Many of water's emergent properties, such as its cohesion, high specific heat, and high heat of vaporization, result from the fact that water molecules __________.

• tend to repel each other

• are attracted to each other by partial negative and positive charges on the oxygen and hydrogen atoms, respectively

• are extremely large

• are in constant motion

Because organisms are made primarily of water, they resist rapid temperature changes. This useful quality is based on water's __________.

• buffering activity

• high specific heat

• properties as a solvent.

• lower density in the solid phase

Sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water. The best term to describe this mixture would be __________.

• an aqueous solution

• an aqueous solvent

• a solute

• a solvent