The number of protons in the nuclei of their atoms
The number of atoms in a sample of each element
The number of electrons in the nuclei of their atoms
The number of nuclei in their atoms
A pair of electrons is shared between two atoms.
The outer energy levels of the atoms are filled.
An electrical force forms between pairs of electrons.
An electrical force forms between oppositely charged ions.
Carbon, nitrogen, and hydrogen
Carbon, hydrogen, and oxygen
Starches and sugars
Carbon, hydrogen, nitrogen, and oxygen
Saturated fatty acids contain at least one carbon-carbon double bond.
Saturated fatty acids are found only in oils.
Carbons in saturated fatty acids are bonded together only with covalent bonds.
Saturated fatty acids contain only carbon-carbon single bonds.
Enzyme and products
Enzyme and catalyst
Enzyme and substrates
Enzyme and active site
It raises the activation energy of the reaction.
It lowers the activation energy of the reaction.
It has no effect on the activation energy of the reaction.
First it lowers the activation energy to start the reaction, then it raises the activation energy to keep the reaction under control.
Concentration of substrate
Both temperature and pH
Less than 7
Between 7 and 14
A negative number
More than 7
The Catalyst lowers the energy needed for the reaction to proceed.
The Catalyst raises the energy needed for the reaction to proceed.
The Catalyst does not affect the reaction.
The reaction will not work without the catalyst
Water is a polar molecule.
Water is a nonpolar molecule.
Water is an ionic compound.
Water is an ion.
Phospholipids and proteins
Cholesterol and nucleic acids
Proteins, nucleic acids, and cholesterol
Phospholipids, cholesterol, and proteins