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