biol 1406: exam 1 (1-4)

What is the correct sequence of steps in the scientific method?

Observation, hypothesis, experiment, conclusion

Which of the following best describes a hypothesis?

A testable explanation for an observation

Which level of biological organization includes all others on the list?

Organ system

A controlled experiment is one that:

Has only one independent variable

Which subatomic particle has a negative charge?

Electron

What determines the atomic number of an element?

Number of protons

What type of bond involves the sharing of electrons?

Covalent

An atom that has gained or lost electrons is called a(n):

Ion

Which of the following is a trace element?

Iron

Which property of water allows it to stick to other substances?

Adhesion

Water's ability to moderate temperature is due to its:

High heat of vaporization

The hydrogen bond in water are responsible for all of the following EXCEPT:

Covalent bonding between atoms

A solution with pH of 3 is:

Strongly acidic

Which element is the backbone of organic molecules?

Carbon

What type of isomer differs in the spatial arrangement around a double bond?

Geometric (cis-trans)

Which functional group acts as a base?

Amino

What type of bond links carbon atoms in hydrocarbons?

Nonpolar covalent bonds

Which functional group is found in alcohol?

Hydroxyl

Which of the following is not a characteristic of life?

Decay

What is the correct order of the biological hierarchy from simplest to complex?

Cell → Tissue → Organ → Organ System

Which subatomic particle has a positive charge?

Proton

Which atom is the central framework of all organic molecules?

Carbon

Which of the following are structural isomers?

Molecules with different covalent arrangements of atoms

What does the term "organic" mean in chemistry?

Contains carbon and hydrogen

Enantiomers are molecules that:

Are mirror images of each other

Which of the following is an example of a buffer in human blood?

Carbonic acid-bicarbonate system

Which of the following properties of water allows it to travel up plant stems?

Cohesion and adhesion

A solution with a pH of 4 is:

Acidic

Which subatomic particles are located in the nucleus?

Protons and neutrons

An atom becomes cation when it:

Loses an electron

In the scientific method, a hypothesis must be:

Testable and falsifiable

Which level of biological organization is more complex than a tissue?

Organ

Water's high specific heat is due to:

Hydrogen bonding

What is the concentration of H⁺ ions in a solution with a pH of 3?

10⁻³ M

Which of the following is NOT a functional group?

Isomer

Which statement best describes biology?

The study of living organisms and their interactions

Which level of organization includes all the others?

Ecosystem

Which of the following has the smallest mass?

Electron

Which element is the most abundant in the human body?

Oxygen

What causes surface tension in water?

Cohesion between molecules

Which property of water allows it to dissolve many substances?

Its polarity

What type of substance resists changes in pH?

Buffer

Which type of organic molecule includes DNA and RNA?

Nucleic acids

Which of the following solutions has the highest concentration of OH⁻ ions?

pH 13

Which type of isomer has the same molecular formula but different covalent arrangements of atoms?

Structural

What is the basic unit of life?

Cell

Natural selection results in:

Survival and reproductions of organisms best suited to their environment

Evolution is considered the core theme of biology because it explains:

The diversity and unity of life

Blue-footed boobies are used in biology texts as an example to demonstrate:

Natural selection and reproductive behavior