Answer:
D. There is no enough oxygen in the culture fluid
Explanation:
The cells in the test tube need to carryout one of the important metabolic processes of living organisms - respiration. The process involves the breakdown of glucose to generate energy for other metabolic processes in the cell.
Respiration can be carried out in the presence of oxygen (aerobic) or in the absence of oxygen (anaerobic). Human cells are primarily aerobic but can carryout respiration anaerobically in the presence of inadequate oxygen.
For aerobic respiration, glucose is broken down in the presence of oxygen to produce carbon-dioxide, water and energy in the form of ATP:

<em>In the absence of oxygen, the glucose becomes converted to lactic acid and a smaller amount of ATP is produced as compared to aerobic respiration.</em>
<em>Hence, lactic acid gradually builds up in the absence of oxygen due to anaerobic respiration.</em>
The correct option is D.
Answer:
The enlargement of the scrotum and testes.
Explanation:
We need answers to choose from haha
Answer:
The steps will be in order in the sequence 12,13,11,4 and 15
Explanation:
12. In glycolysis, glucose is converted into pyruvate. ATP and NADH ARE MADE.
13. Pyruvate is oxidized and converted into acetyl CoA in the mitochondria. Carbon dioxide and NADH are also made.
11. The acetyl CoA undergoes a series of changes and ATP, FADH2, NADH, and carbon dioxide are released.
4. NADH and FADH2 lose their electrons and get converted back into NAD+ and FAD.
15. Oxygen takes electrons and water is produced. 34 ATP molecules are released.