Question

7 multiple choice 1 point
which of the following is true about pheromones?
○ they are small peptides
○ they fly in the air to reach yeast cells of the opposite type
○ they are produced by insects that feed on yeast products
○ they are gametes of yeast cells of different mating types

Explanation:

1. Analyze "They are small peptides": Pheromones in yeast (like mating pheromones) are often small peptide - like molecules or other signaling molecules, but let's check other options.
2. Analyze "They fly in the air to reach yeast cells of the opposite type": Yeast is a unicellular fungus, and pheromones in yeast are released into the surrounding medium (usually liquid - based environment of yeast, not air - borne for yeast - yeast communication), so this is incorrect.
3. Analyze "They are produced by insects that feed on yeast products": Pheromones related to yeast mating are produced by yeast cells themselves, not by insects feeding on yeast products. Insect pheromones are different and not related to yeast mating pheromones in this context.
4. Analyze "They are gametes of yeast cells of different mating types": Pheromones are signaling molecules, not gametes. Gametes are the reproductive cells (like spores or mating - type cells in yeast, but pheromones are signals to attract or initiate mating between different mating - type yeast cells).

Among the options, the most accurate (considering yeast pheromones which are often small peptide - like signaling molecules) is "They are small peptides".

Answer:

A. They are small peptides