Researchers investigated whether time of day affects the rate at which certain mRNAs produced by plants are broken down. At either 1 hour after the start of the light period (morning) or 8 hours after the start of the light period (afternoon), the researchers treated identical plant seedlings with a compound that blocks transcription (time = 0 min). The researchers measured the percent remaining of two mRNAs, mRNA G and mRNA H, over the course of 120 minutes. The data are shown in Figure 1.   Based on the data, which of the following best describes the relationship between light and the degradation of mRNA G and mRNA H?   a. mRNA G and mRNA H degrade at the same rate during morning exposure to light.   b. An increase in exposure to light causes an increase in the degradation of both mRNA G and mRNA H.   c. Exposure to more-intense afternoon light causes both mRNA G and mRNA H to degrade more rapidly in the afternoon than in the morning.   d. A longer exposure to light increases the rate of mRNA G degradation but not of mRNA H degradation.

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Researchers investigated whether time of day affects the rate at which certain mRNAs produced by plants
are broken down. At either 1 hour after the start of the light period (morning) or 8 hours after the start of the
light period (afternoon), the researchers treated identical plant seedlings with a compound that blocks
transcription (time = 0 min). The researchers measured the percent remaining of two mRNAs, mRNA G
and mRNA H, over the course of 120 minutes. The data are shown in Figure 1.
 
Based on the data, which of the following best describes the relationship between light and the degradation
of mRNA G and mRNA H?
 
a. mRNA G and mRNA H degrade at the same rate during morning exposure to light.
 
b. An increase in exposure to light causes an increase in the degradation of both mRNA G and mRNA H.
 
c. Exposure to more-intense afternoon light causes both mRNA G and mRNA H to degrade more rapidly in the afternoon than in the morning.
 
d. A longer exposure to light increases the rate of mRNA G degradation but not of mRNA H degradation.
### Degradation of mRNA G and mRNA H Over Time

#### Overview:
The graph provided illustrates the degradation of two types of mRNA, labeled as mRNA G and mRNA H, over time. The measurements of mRNA levels were taken after exposure to light for distinct durations: 1 hour (labeled as morning) and 8 hours (labeled as afternoon).

#### Graph and Data Explanation:
- **X-Axis (Horizontal):** Represents time in minutes (min), ranging from 0 to 120 minutes.
- **Y-Axis (Vertical):** Represents the relative percentage of mRNA remaining, ranging from 0% to 100%.
  
#### Key:
- **mRNA G - morning:** Represented by open triangles (△)
- **mRNA G - afternoon:** Represented by filled triangles (▲)
- **mRNA H - morning:** Represented by open circles (○)
- **mRNA H - afternoon:** Represented by filled circles (●)

#### Trends:
- **General Degradation:** Both mRNA G and mRNA H show a decrease in relative percentage remaining over the 120-minute period.
- **Comparison Over Time:**
  - **mRNA G:** 
    - Degraded more slowly in the morning (△) compared to the afternoon (▲).
    - After 120 minutes, less mRNA G remains in the afternoon condition compared to the morning.
  - **mRNA H:**
    - Degraded at a somewhat similar rate in both the morning (○) and afternoon (●), with minor variations.
    - Overall, mRNA H consistently showed higher degradation compared to mRNA G under both conditions.

#### Conclusion:
The graph suggests a difference in the degradation patterns of mRNA G and mRNA H, influenced by the time of exposure to light. mRNA G showed higher stability in the morning, while mRNA H degraded at a nearly consistent rate regardless of the light exposure duration.

**Figure 1:** Representation of the degradation trends for mRNA G and mRNA H over time with different light exposure conditions.
Transcribed Image Text:### Degradation of mRNA G and mRNA H Over Time #### Overview: The graph provided illustrates the degradation of two types of mRNA, labeled as mRNA G and mRNA H, over time. The measurements of mRNA levels were taken after exposure to light for distinct durations: 1 hour (labeled as morning) and 8 hours (labeled as afternoon). #### Graph and Data Explanation: - **X-Axis (Horizontal):** Represents time in minutes (min), ranging from 0 to 120 minutes. - **Y-Axis (Vertical):** Represents the relative percentage of mRNA remaining, ranging from 0% to 100%. #### Key: - **mRNA G - morning:** Represented by open triangles (△) - **mRNA G - afternoon:** Represented by filled triangles (▲) - **mRNA H - morning:** Represented by open circles (○) - **mRNA H - afternoon:** Represented by filled circles (●) #### Trends: - **General Degradation:** Both mRNA G and mRNA H show a decrease in relative percentage remaining over the 120-minute period. - **Comparison Over Time:** - **mRNA G:** - Degraded more slowly in the morning (△) compared to the afternoon (▲). - After 120 minutes, less mRNA G remains in the afternoon condition compared to the morning. - **mRNA H:** - Degraded at a somewhat similar rate in both the morning (○) and afternoon (●), with minor variations. - Overall, mRNA H consistently showed higher degradation compared to mRNA G under both conditions. #### Conclusion: The graph suggests a difference in the degradation patterns of mRNA G and mRNA H, influenced by the time of exposure to light. mRNA G showed higher stability in the morning, while mRNA H degraded at a nearly consistent rate regardless of the light exposure duration. **Figure 1:** Representation of the degradation trends for mRNA G and mRNA H over time with different light exposure conditions.
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