patrilineal descent. (noun) Tracing an individualâs descent through their fatherâs side of the family. Audio Pronunciation: (patÂ·riÂ·linÂ·eÂ·al deÂ·scent). Download Audio Pronunciation: patrilineal descent .mp3. Usage Notes: 1  Plural: patrilineal descents. 2  An agnate is blood relative in a patrilineal descent. Patrilateral refers to a personâs relations on their fatherâs side. 2  A type of unilineal descent. 3  In contrast to patrilineal descent, matrilineal descent is tracing an individualâs descent through their motherâs side of the family. 4  Also called: 5  agnatic. 6  agnatic descent. 7  agnation.
Bacteria and yeast. Anaerobic respiration takes place in yeast and some bacteria, producing ethanol and carbon dioxide. They have been used in the making of many foods such as bread, yoghurt and vinegar. You must know the structure and functions of a bacterial cell and yeast cell.Diagram of bacterial cell.naerobic respiration takes place in yeast and some bacteria, producing ethanol and carbon dioxide. They have been used in the making of many foods such as bread, yoghurt and vinegar.
Yeast growth and metabolism. When yeast cells are grown in rich carbon sources such as glucose they prefer to grow by fermentation. During fermentation glucose is converted into carbon dioxide and ethanol. Generally, fermentation occurs in the absence of oxygen, and is therefore anaerobic by nature.east cells can also reproduce sexually. Yeast cells exist as one of two different mating types, a cells and alpha cells. When cells of opposite mating types are mixed together in the lab or randomly come into contact in nature they can mate (conjugate).