Principles of bio 1 test 1

What is an organic compound?

A compound that contains carbon

What does the term theory mean to a scientist?

A hypothesis that has been supported by a large number of experiments

Which of the following is not a characteristic of life?

Ability to move

Which of the following properties of water molecules has important implications to life?

All of the above

Fire can move, grow, reproduce, use energy, consume oxygen, and interact with its environment. Why is it not alive?

All of the above are correct

What is a trace element?

An element that is required in miniscule amounts for life

If you were to combine all of the ecosystems on the planet, you would obtain the

Biosphere

Which is not one of the four atoms that make up the bulk of living organisms

Calcium

Which of the following is the correct organizational hierarchy, from largest to smallest, in the hierarchical order of life? (Some levels have been omitted, so you are looking for the correct order.)

Ecosystem → Community → Population → Organ → Tissue → Cell → Molecule → Atom

Why is one side of a single water molecule partially negative while the other side is partially positive?

Electron pairs are unevenly shared between the oxygen atom and the two hydrogen atoms.

Which of the following represents a simple sugar (also called a monosaccharide)?

Glucose

Which of the following bonds is the weakest?

Hydrogen

What do we call the sum total of all the chemical reactions that take place in your body?

Metabolism

Is a virus considered alive?

No, it does not possess all of the requirements for life

What is the most common element in your body?

Oxygen

The statement, "There are 628 gray squirrels living on campus," describes the ________ of gray squirrels on campus.

Population

Which of the following molecules is solid at room temperature?

Saturated fats

Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?

Skin consists of multiple tissue types that cooperate to perform a specific task.

A needle can be made to "float" on the surface tension of water. What causes this surface tension to form?

The cohesion of water molecules to each other

Which of the following accurately describes the pH scale?

The pH scale runs from 0 (most acidic) to 14 (most basic), with 7 as a neutral.

How is life defined?

Through a set of shared characteristics that all living things display

A population consists of

a group of interacting individuals from different species

Something with a pH of 5 would be ________.

acidic

What are the monomers of proteins?

amino acids

Which of the following large organic molecules include table sugar?

carbohydrates

What are the four classes of large organic molecules important to life on Earth?

carbohydrates, proteins, lipids, nucleic acids

What is the smallest unit of life?

cell

Which of the following is a polysaccharide?

cellulose

The chemical name for table salt is sodium chloride, or simply NaCl. What type of chemical is NaCl?

compound

The bond in which bonded atoms share electrons is called a(n) ________.

covalent bond

The building of a large organic molecule from small subunits involves multiple ___

dehydration synthesis reactions

A college campus - including the students, birds, trees, sidewalks, and air - makes up one complete

ecosystem

Water is the least dense when it ________.

freezes

The breaking of a large organic molecule into smaller individual subunits involves multiple ________.

hydrolysis reactions

All lipids are ________.

hydrophobic

A polypeptide is a

long chain of amino acids

What is typically the first step in the scientific method?

observation

What kind of bond joins amino acids together to form a protein?

peptide bond

What is another name for the polymers of carbohydrates?

polysaccharides

Enzymes are a type of ________.

protein

During a chemical reaction, atoms are ___

rearranged

Select the most complete explanation of what the pH scale measures.

the concentration of hydrogen ions in a solution

A well-substantiated explanation of some aspect the natural world, based on a body of facts that have been repeatedly confirmed through observations and experiments, is referred to as a(n)

theory