The basic unit of structure and function in living things.

• Atom

• cell

• Molecule

• Organelle

An action or change in behavior that occurs as a result of a stimulus.

• organism

• cell

• response

• stimulus

Which cellular structures are present in ALL prokaryotic and eukaryotic cells?

• Nucleus

• Ribosomes

• Cell wall

• Mitochondria

Biology is the science that studies . . .

• Living organisms

• The interactions of organisms with one another

• The interactions of organisms with their environment

• Rocks

• The brain

Isotopes are two or more atoms that

• Differ in the number of electrons but have the same molecular weight

• Have the same number of protons but differ in the numbers of electrons

• Have different atomic numbers but the same number of neutrons

• Have the same atomic number but different atomic weights

• Have the same number of electrons but differ in the number of neutrons

A cell lacking cholesterol in its plasma membrane would likely

• Not be recognized by other cells

• Lose permeability

• Not be able to withstand temperature changes

• Have difficulty moving large polar molecules across the membrane

• Not be anchored to the cytoskeleton

Which of the following are NOT true?

• Populations exist with ecosystems which exist within communities

• Cells exist within organs which exist within organisms

• Molecules exist within organelles which exist within cells

• All of the above are true

When your body temperature rises, you start to sweat. Evaporation of sweat is what leads to cooling of the body surface. Which key function of living organisms is this?

• Energy processing

• Homeostasis

• Sensitivity to stimuli

• Adaption

When an atom loses an electron, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

How are ionic bonds formed?

• Transfer of electrons
• Sharing of electrons