QUARTER FINALS SPEED RACE ROUND 2
2025
GSTS: 39 points (Winner)
PRESEC, Legon: 38 points
OLAG: 28 points
QUESTION
What is the most common method of asexual reproduction in unicellular yeast?
ANSWER: Budding
EXPLANATION
In budding, a small outgrowth (bud) forms on the parent yeast cell, grows, and eventually pinches off as a new, genetically identical daughter cell, without the parent needing to divide symmetrically.
PRACTICE QUESTIONS
1. To which kingdom does yeast belong?
ANSWER: Fungi.
2. Is yeast unicellular or multicellular?
ANSWER: Unicellular.
3. What are the products of anaerobic respiration (fermentation) in yeast?
ANSWER: Ethanol and carbon dioxide.
4. How does yeast make bread dough rise?
ANSWER: It releases carbon dioxide, which forms bubbles in the dough.
5. Are the daughter cells formed by budding genetically identical to the parent?
ANSWER: Yes, they are clones.
6. Name two conditions that favour budding in yeast.
ANSWER: Warmth and a supply of sugar and moisture.
7. Name a multicellular animal that reproduces by budding.
ANSWER: Hydra.
8. What are the spores produced by yeast in sexual reproduction called?
ANSWER: Ascospores.
9. What is the scientific name of baker's yeast?
ANSWER: Saccharomyces cerevisiae.
10. Name one industry that uses yeast.
ANSWER: Brewing (or baking).
11. How does budding differ from binary fission?
ANSWER: In budding the parent forms a small outgrowth, so the two parts are unequal, but in binary fission it divides into two equal cells.
12. What happens to the bud after it has grown?
ANSWER: It detaches as a new cell, or may stay attached to form a colony.