Problemas
Students placed yeast cells into a test tube They added sugar solution to the test tube and placed a rubber stopper on the end. They left the test tube at room temperature to examine after reading about yeast. Students discovered through reading that yeast are single-celled fungi that contain many mitochondria, but chloroplasts are absent. What most likely occurred in the test tube while the students were reading? A Yeast produced carbon dioxide due to cellular respiration. B Yeast produced carbon dioxide due to photosynthesis. C Yeast produced oxygen due to cellular respiration. D Yeast produced oxygen due to photosynthesis.
Roztwór
Jacobo
professionell · Tutor durante 6 años
4.3
(154 Votos)
Respuesta
A
Explicación
## Step 1Yeast is a type of fungus, not a plant, so it does not perform photosynthesis. Photosynthesis is a process that converts light energy, usually from the sun, into chemical energy that can be later released to fuel the organisms' activities. This process is carried out by plants, algae, and some bacteria, which contain chloroplasts. Yeast, being a fungus, does not contain chloroplasts and therefore cannot perform photosynthesis.## Step 2Yeast, like all other living organisms, performs cellular respiration to produce energy. Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products. The reactions involved in respiration are catabolic reactions, which break down large molecules into smaller ones, releasing energy in the process.## Step 3During cellular respiration, yeast consumes sugar and produces carbon dioxide and ethanol as byproducts. This process is known as fermentation. The carbon dioxide produced during fermentation can cause the yeast to rise, which is why yeast is often used in baking.## Step 4Given the above information, the most likely occurrence in the test tube while the students were reading is that the yeast produced carbon dioxide due to cellular respiration. This corresponds to option A.