Competency Challenge #3

Lipids are composed mainly of which of the following atoms?

• Oxygen and nitrogen

• Hydrogen, oxygen, and nitrogen

• Carbon and hydrogen

• Carbon, nitrogen and sulfur

When DNA replicates, each original strand of DNA serves as a template for a new strand. What type of replication is this?

• Anti-parallel replication

• Semi-conservative replication

• Double helical replication

• Base-paired replication

Complimentary base pairing between two DNA strands is due to the formation of:

• Hydrogen bonds

• Phosphodiester bonds

• Ionic bonds

• Operon bonds

Transcription begins when RNA polymerase binds to which area on the DNA strand?

• Okazaki fragment

• Poly(A) tail

• 5' cap

• Promoter

Which process occurs at structure W?

• Packaging of molecules

• Aerobic respiration

• Protein Synthesis

• DNA replication

Where does translation take place in prokaryotes?

• In the nucleus

• At the ribosomes

• At the lysosomes

• At the vacuoles

Which of the following is the primary component of proteins?

• Antibodies

• Nucleotides

• Acetic acids

• Amino acids

Which of the following is true of proteins with quaternary structure?

• They contain all known amino acids

• They can have catalytic subunits

• They cannot be denatured

• They only have one polypeptide chain

Why are enzymes necessary in living organisms?

• Enzymes increase the rate of chemical reactions which would otherwise occur too slowly to sustain life.

• Enzymes raise the activation energy required for a reaction to proceed.

• Enzymes are the source of energy for most reactions.

Which of the following affects the rate of a chemical reaction?

• Concentration

• Presence of a catalyst

• Heat

• All of these