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WorksheetsChemistry of Life 1 (The Chemical Context of Life)
Total questions: 23
Worksheet time: 12mins
Why are chemistry and biology inherently related subjects?
Both are about matter ("stuff"). Bio is more specific to living things
Chem is based on atoms/molecules and their interactions. Living things function due to atoms/molecules
The functioning of living things is due to chemistry/chemical reactions/molecular interactions (i.e. metabolism)
All answers are correct
Which of the following is the smallest unit of a living thing?
Cell
Atom
Molecule
Organ
All of the following are characteristics of living things EXCEPT
Is composed of atoms
Order (cells and DNA)
Evolution
Response to stimuli
Growth & development
Which of the following is an example of homeostasis?
A plant respires to thermoregulate
A dog secretes insulin to decrease blood sugar levels
A bacterial cell expels water to regulate ion concentrations
All answers are correct
Anabolic biochemical reactions _ energy and allow for the _ of larger molecules
Require, breakdown
Require, buildup
Release, breakdown
Release, buildup
Which of the following is an example of a compound?
NaCl dissolved in water
NaCl
Na
Air
What are the elements of life?
CHNOPS
C, H, and O
C and H2O
Fire, magic, thunder, and Kanye
Which of the following is an example of trace element?
I
C
P
S
Which of the following statements about the nucleus of an atom is false?
It contains protons and neutrons
It is very small/dense
Its overall charge is +
It allows for the chemical behavior of the atom
Which of the following statements regarding a Carbon-14 atom is false?
Its atomic number is 6
It contains 6 protons
It contains 14 neutrons
Its mass number is 14
_ are the subatomic particles that determine how atoms interact with one another (and as a side note this is what we care about in biology). They exist, most accurately, in _
Electrons, orbitals
Electrons, energy levels (shells)
Protons, orbitals
Protons, energy levels (shells)
Covalent bonds involve a _ of electrons. In a triple covalent bond (represented by three lines) there are _ total electrons involved in the bond
Sharing, 6
Sharing, 3
Transfer, 6
Transfer, 3
Which of the following statements regarding polar covalent bonds and molecules is false?
A polar molecule must contain at least one covalent bond with an uneven sharing of electrons
If a molecule contains polar covalent bonding then it is always polar
Polar molecules have charged and uncharged ends
Polar molecules never involve ionic bonding (only covalent)
Polar molecules are always made up of all nonmetal atoms
_ bonding is most prevalent in living things that are primarily made up of _
Covalent, molecular compounds (molecules)
Covalent, ionic compounds (salts)
Ionic, molecular compounds (molecules)
Ionic, ionic componds (salts)
In an ionic bond the metal atom loses one or more electrons to become _ in charge. This type of ion is called a(n) _
Positive, cation
Positive, anion
Negative, cation
Negative, anion
Which of the following statements regarding a crystal of sodium chloride (NaCl) is false?
Its overall charge is neutral
It contains millions of sodium and chloride ions (repeating lattice)
The nonmetal ions present are called anions with negative charge
It is an example of a molecular compound (molecule)
All of the following are examples of intermolecular forces (IMFs) except
Covalent bonds
Ion-dipole
Hydrogen bonding
Van der Waals interactions
Why are IMFs vitally important to the functioning of living things?
They allow the molecules of living things to respond/interact/engage with one another
They allow the molecules of living things to remain intact
An ion dipole IMF is a _ interaction between an ion and a dipole (charged end) of a _molecule
Weak, polar
Weak, nonpolar
Strong, polar
Strong, nonpolar
Which of the following statements regarding hydrogen bonding is false?
Despite its name it is a type of IMF not a type of bonding
It is present between all polar molecules
The three types are H with O, N, and F
Hydrogen bonds do not exclusively exist between two of the same molecules
The most significant H bonds that exist wrt to biology and living things are between water molecules
What is the only type of IMF (weak interactions) that exist between nonpolar molecules?
Nonpolar covalent bonds
Van der Waals
Hydrogen bonding
Dipole-dipole
Which of the following statements explains the importance of a molecule's structure/shape (wrt to biology and living things)?
The structure determines the function of a biological molecule
A molecule's specific role in maintaining metabolism & homeostasis is dependent on its structure/function
Molecular shape determines how biological molecules recognize and and respond to one another with specificity
All answers are correct
Every single function of an organism (ex. reading these words) is the end result of thousands of biochemical reactions. These reactions are made possible by molecular structure
_ are what go into chemical reactions. In this process atoms/molecules are _
Reactants, changed
Reactants, rearranged
Products, changed
Products, rearranged
