The drawing below shows a classroom investigation using yeast.
Explain how the result of the investigation indicates that yeast cells use sugar for survival.
Question 5
5.
Question 6
6.
Budding Bakers
Sometimes there is a piece of bread provided with school lunch. The bread in a school lunch is a combination of yeast, wheat flour, and other ingredients. Did you know that there was once a living organism in that roll? Yeast is a type of fungus that makes dough rise or increase in size to become soft.
The drawing below shows dry yeast from a container.
Yeast cells have organelles like those found in humans. The table below shows how yeast appears under a microscope and describes how it appears at two magnifications.
Yeast uses cellular respiration for energy. Yeast cells are able to get the materials they need through their semi-permeable membranes. Depending on the size of the molecule, some molecules may pass through freely while others may not.
Question 1
1.
Question 2
2.
Yeast uses cellular respiration to fulfill its energy needs. Write a label or draw an arrow in each box to create a model showing how two substances move across a yeast cell membrane, allowing cellular respiration to occur.
In ➡️
Out ⬅️
After learning about how yeast obtains energy, a group of students made a chart to compare how yeast and trees obtain energy.
Carbon Dioxide
Oxygen
Cellular Respiration (Input Gas)
Photosynthesis (Input Gas)
After learning about how yeast obtains energy, a group of students made a chart to compare how yeast and trees obtain energy.
Sunlight
Sugar
Cellular Respiration (Energy Source)
Photosynthesis (Energy Source)
A group of students decided to investigate further whether the yeast was alive or not. They observed yeast under a microscope and made the following claims. Which student’s claim is best supported?
Student 2: Yeast is not alive and is composed of elements similar to the composition of a rock.
Student 1: Yeast is alive and is a single-celled organism that contains organelles.
Student 3: Yeast is alive and is a multicellular organism containing organelles.
Student 4: Yeast is not alive and composed of atoms of only one type of element.
Based on the passage, which three characteristics can best be used to identify yeast cells as living organisms?
