Question

1. which statement could be proven false using a counterexample?

all cells have ribosomes.
all clarinets are woodwinds.
all fruits come from trees.
the names of all of the days of the week have at least two syllables.

Explanation:

• All cells have ribosomes: Prokaryotic and eukaryotic cells have ribosomes. There is no counter - example.
• All clarinets are woodwinds: By definition, clarinets are woodwind instruments. No counter - example.
• All fruits come from trees: Strawberries are fruits that grow on low - lying plants (not trees). This is a counter - example.
• The names of all of the days of the week have at least two syllables: “Sunday” has two syllables, “Monday” has two syllables, “Tuesday” has two syllables, “Wednesday” has three syllables, “Thursday” has two syllables, “Friday” has two syllables, “Saturday” has three syllables. No counter - example.

Answer:

All fruits come from trees.