Solution idea: Molecules of tRNA bring amino acids to the ribosome in the correct sequence. Amino Acids Amino acids are the building blocks of proteins. Molecules of tRNA bring the building blocks of proteins to the ribosome in the correct sequence.
Q: What brings the building blocks of proteins to the ribosomes in the correct sequence?
Options:
- (A) recycling
- (B) flow of electrons
- (C) Chemical energy
- (D) it needs them
- (E) an engine
- (F) light energy
- (G) A computer
- (H) molecules of tRNA
A: (H)

Solution idea: Viruses are not cells. Influenza viruses mutate. Influenza is not a cell.
Q: What is not a cell?
Options:
- (A) all matter
- (B) layers of fat
- (C) illness
- (D) bacteria
- (E) influenza
- (F) Leptospirosis
- (G) an object
- (H) hydrocarbons
A: (E)

Solution idea: Bivalves feed on plankton and nonliving organic matter. Bivalve molluscs are very common. Molluscs feed on plankton and nonliving organic matter.
Q: What feeds on plankton and nonliving organic matter?
Options:
- (A) bacteria
- (B) barnacles
- (C) animals
- (D) sharks
- (E) pythons
- (F) graptolites
- (G) molluscs
- (H) bears
A: (G)

Solution idea: Hair is a fiber that is found only in mammals. All mammals have fur or hair. Fur is a fiber that is found only in mammals.
Q: Fur is a fiber that is found only on what kind of animal?
Options:
- (A) animals
- (B) reptiles
- (C) bird
- (D) humans
- (E) mammals
- (F) insects
- (G) goats
- (H) Animal fur
A: (E)