DNA features two sugar-phosphate chains that run in opposite directions, with one up and one down. This characteristic is known as:
A. anti-parallel.
B. bilateral.
C. parallel.
D. bisecting.
Which of the following is the correct description of stoichiometry?
A. Stoichiometry describes the chemical reactions between the elements of a compound.
B. Stoichiometry is the calculation of relative quantities of reactants and products in chemical reactions.
C. Stoichiometry describes the color flares expected based on the participants of a chemical reaction.
D. Stoichiometry describes the fundamental properties of atoms universally.
In a redox reaction, the element that is oxidized _____ an electron and the element that is reduced _____ an electron.
A. gains, loses
B. loses, gains
C. loses, loses
D. gains, gains
What characteristic of an element determines its specific isotope?
A. Number of protons
B. Number of neutrons
C. Number of electrons
D. Number of quarks
The addition of a catalyst to a chemical reaction will have what effect?
A. Increase the energy required for the reaction to take place
B. Increase the time required for the reaction to take place
C. Increase the rate at which the reaction takes place
D. Reduce the amount of products in the reaction
What is the basic structure of an amino acid?
A. An amine group, a carboxyl group, and a functional R-group.
B. An amine group, a polar side chain, and a non-polar side chain.
C. An amide group, an alcohol group, and a functional R-group.
D. An amine group, and an amide group.
A concentration of 120.9132 g of MgO in 3L of solution will be what molality? (The atomic weight are: Magnesium: 24.305 g/mol, Oxygen: 15.9994 g/mol)
A. 0.5 mol MgO
B. 1.0 mol MgO
C. 1.5 mol MgO
D. 2.0 mol MgO
Polarity is based on the difference in:
A. electronegativity values for the elements involved in the bond.
B. atom number for the elements involved in the bond.
C. concentrations of the elements involved in the bond.
D. quantities of the elements involved in the bond.
In a complete combustion reaction involving adequate amounts of oxygen and a compound containing carbon and hydrogen, the products are always?
A. carbon monoxide and oxygen
B. carbon dioxide and water
C. heat and water
D. carbon dioxide and heat
Between which two molecules is a phosphodiesterase bond?
A. Two sugars
B. Two amino acids
C. Two ammonium molecules
D. PO4 and another molecule
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