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...physical properties. Next you will learn about yeast, the fungal microorganism that is used to convert carbohydrates, such as sugars and starches, into carbon dioxide and ethanol through the fermentation reaction. You will look at a homebrew kit and you can take part in an optional home experiment that will run alongside this course. Furthermore, you will learn about the...

...physical contact with another yeast cell. First, it has to ‘call’ to yeast cells of the opposite mating type. It does this by secreting a ‘mating factor’ peptide, an extracellular signal, which can also be called an ‘intercellular signal’. Yeast mating factor binds to specific cell surface receptors on cells of the opposite mating type, and the signal is...

...physical consequences can be quite noticeable and in one case, as you will see later, very severe. NARRATOR 60-second Adventures in Astronomy Number 5, The Rotating Moon. Whenever you look at the Moon from Earth, it always looks similar. Different parts are illuminated at different times, but oddly, we always see the same features. The Moon never turns its back on us,...