Question 1 (1 point) Let's look at growth in Chlamydomonas . Which of the following statements is correct.? A. Like humans Chlamydomonas doesn't need sulfur (S) to grow. B. In the lag phase of growth, the number of cells is constant over time. C. A possible reason the cells stop growing in stationary phase is because the growth media has no more nitrogen (e.g. NH_(4)^+Cl) D. Most bacteria grow much more slowly than Chlamydomonas. √ Saved

The correct answer is **C. A possible reason the cells stop growing in stationary phase is because the growth media has no more nitrogen (e.g., NH₄⁺Cl).**<br /><br />Here's why:<br /><br />* **A. Like humans Chlamydomonas doesn't need sulfur (S) to grow.** Incorrect. Chlamydomonas, like all living organisms, requires sulfur for various biological processes, including the synthesis of certain amino acids and proteins.<br /><br />* **B. In the lag phase of growth, the number of cells is constant over time.** Incorrect. The lag phase is a period of adaptation, where cells are preparing for division. While the number of cells doesn't increase dramatically, it's not entirely constant. There is some metabolic activity and a slight increase in cell size.<br /><br />* **D. Most bacteria grow much more slowly than Chlamydomonas.** Incorrect. Generally, bacteria have much faster generation times than Chlamydomonas. Bacteria can often reproduce in minutes, while Chlamydomonas takes longer (hours).<br /><br />* **C. A possible reason the cells stop growing in stationary phase is because the growth media has no more nitrogen (e.g., NH₄⁺Cl).** Correct. The stationary phase occurs when the growth rate equals the death rate. Nutrient depletion, such as running out of nitrogen, is a common reason for cells entering the stationary phase. Nitrogen is essential for building proteins and nucleic acids, so without it, Chlamydomonas cannot continue to grow.<br />