Reading 21

 

Question: 21 of 39

INCORRECT

• Time Remaining: 06:56:18

Use the passage below to answer the question.

Thousands of passenger jets are safely in use today, navigating the skies of the United States. It takes many people to keep them flying and to ensure the safety of travelers. Mechanics are needed to fine-tune the powerful engines. Electricians maintain the electrical systems. Radio specialists must calibrate the navigational equipment. Many other skilled technicians are also needed to provide the care that keeps these planes safe. Qualified people can find employment in the airline industry.

Stimulus: 1 of 2

Which of the following is a logical conclusion based on the passage?

Mechanics must perform routine maintenance after other maintenance procedures.

This is not a logical conclusion based on the passage. The passage does not indicate specifics regarding a mechanic's responsibilities.

Radio specialists must be qualified before calibrating navigational equipment.

This is a logical conclusion based on the passage.

Mechanics must be qualified to apply for employment with an airline.

This is not a logical conclusion based on the passage. Though the passage states that qualified people can find employment with an airline, it does not reference specific application requirements.

Electricians and radio specialists must perform routine maintenance simultaneously.

MY ANSWER

This is not a logical conclusion based on the passage. The passage does not indicate specifics regarding routine maintenance procedures.

Leptin level increase

 

Question: 19 of 39

CORRECT

• Time Remaining: 07:04:49

Use the passage below to answer the question.

What controls our hunger? Our central nervous system (CNS) influences our feeding behavior and metabolism. The brainstem receives signals from our gut and hypothalamus. When our stomach is empty, the appetite-stimulating neurons in the hypothalamus send information to the brainstem, signaling hunger. This leads to the secretion of ghrelin, a hunger-stimulating hormone that is mainly released by the stomach. When we eat, our brain perceives the stomach's distention as satiety and stops ghrelin's secretion. Leptin, another hormone released from fat cells, also affects the hypothalamic neurons. It triggers the brain to lower our appetite when we've eaten enough. However, leptin resistance prevents the satiety signal from being properly decoded by the brain, which can lead to overeating and weight gain. 

Stimulus: 1 of 2

"Leptin, another hormone released from fat cells, also affects the hypothalamic neurons. It triggers the brain to lower our appetite when we've eaten enough."

Which of the following inferences can be reasonably deduced from this excerpt?

People who are overweight have low leptin levels.

Although leptin levels can affect weight gain, this inference is not supported by the excerpt.

It is unclear how leptin levels affect appetite.

The excerpt explains how leptin levels affect appetite. Therefore, this inference is incorrect.

There is no correlation between leptin levels and weight gain.

This excerpt establishes a possible correlation between leptin levels and weight gain. Therefore, this inference is not supported by the excerpt.

Increased leptin levels cause decreased appetite.

MY ANSWER

The excerpt establishes that "leptin triggers the brain to lower our appetite when we've eaten enough." Therefore, we can reasonably deduce that increased leptin levels cause decreased appetite.