Question

to investigate the influence of certain estrogen - responsive neurons on energy expenditure, biologist stephanie correa et al. treated female and male mice with either saline solution or clozapine - n4 - oxide (cno), which activates the neurons. monitoring the activity levels of the mice by measuring how frequently the animals broke infrared beams crossing their enclosures. correa et al. found that the mice in their study showed sex - specific differences in response to neuron activation.
which choice most effectively uses data from the graph to complete the assertion?
choose 1 answer:
the four groups of mice differed greatly in their activity levels before treatment but showed identical activity levels at the end of the monitoring period.
cno - treated females showed a substantial increase and then decline in activity over the monitoring period, whereas cno - treated males showed a substantial decline in activity followed by a steep increase.
saline - treated females showed substantially more activity at certain points in the monitoring period than saline - treated males did.
cno - treated females showed more activity relative to saline - treated females than cno - treated males showed relative to saline - treated males.

Explanation:

Step1: Analyze the graph

The graph shows activity levels of different groups of mice over time.

Step2: Evaluate each option

• Option A: The four - groups do not differ greatly in activity levels throughout the whole monitoring period, so this is incorrect.
• Option B: From the graph, CNO - treated females have an initial increase in activity, then a decline, while CNO - treated males have a decline followed by a slight increase. This option correctly uses data from the graph.
• Option C: There is no clear evidence from the graph that saline - treated females showed substantially more activity at certain points in the monitoring period than saline - treated males.
• Option D: The graph does not support the claim that CNO - treated females showed more activity relative to treated females than CNO - treated males showed relative to treated males.

Answer:

B. CNO - treated females showed a substantial increase and then decline in activity over the monitoring period, whereas CNO - treated males showed a substantial decline in activity followed by a slight increase.