Question 1

Which of the following best describes the relationship between tissues and organs in the hierarchy of biological organization?

Accepted Answer

Organs are composed of multiple tissues working together to perform a specific function.

Question 2

A patient is experiencing a fever, which is a deviation from the body's set point temperature of $$37^\circ C. $$Which homeostatic mechanism is primarily responsible for returning the body temperature to normal?

Accepted Answer

Negative feedback mechanism

Question 3

Which of the following is a correct comparison between RNA and DNA?

Accepted Answer

RNA contains ribose sugar, while DNA contains deoxyribose sugar.

Question 4

During blood loss, the body uses a homeostatic mechanism to restore blood pressure. Which of the following best describes this process?

Accepted Answer

A negative feedback loop increases heart rate to restore blood pressure.

Question 5

Which of the following best explains why the muscular system is important for thermoregulation?

Accepted Answer

Muscle contractions generate heat as a byproduct of energy use.

Question 6

A scientist is studying a molecule that is single-stranded, contains uracil, and has ribose as its sugar. Which molecule is being studied?

Accepted Answer

RNA

Question 7

Which of the following is an example of a positive feedback mechanism in the human body?

Accepted Answer

Blood clotting after an injury

Question 8

If a cell is unable to synthesize proteins, which molecule is most likely malfunctioning?

Accepted Answer

RNA, because it is responsible for protein synthesis.

Question 9

Which of the following best describes the function of the endocrine system in thermoregulation?

Accepted Answer

It secretes hormones that increase heat production.

Question 10

A researcher observes that when blood pressure rises above normal, the body initiates mechanisms to lower it. Which type of feedback is this?

Accepted Answer

Negative feedback

Question 11

Which of the following correctly orders the levels of biological organization from simplest to most complex?

Accepted Answer

Chemical → Cell → Tissue → Organ → Organ system → Organism

Question 12

Which of the following statements about homeostasis is correct?

Accepted Answer

Homeostasis involves maintaining internal conditions within a narrow range around a set point.

Question 13

A person is exposed to cold temperatures, and their body begins to shiver. Which systems are primarily involved in this response?

Accepted Answer

Muscular and nervous systems

Question 14

Which of the following is NOT a correct function of the cardiovascular system?

Accepted Answer

Directly generates heat for thermoregulation

Question 15

Which of the following best explains why DNA is more stable than RNA?

Accepted Answer

DNA is double-stranded and contains deoxyribose, making it less susceptible to hydrolysis.

Question 16

A patient has a genetic disorder that affects the production of deoxyribose. Which molecule's synthesis will be directly impaired?

Accepted Answer

DNA

Question 17

Which of the following scenarios best illustrates a failure of homeostasis?

Accepted Answer

Blood glucose levels rise and remain elevated after a meal due to lack of insulin.

Question 18

Which of the following best describes the function of a set point in homeostatic regulation?

Accepted Answer

It is the desired value or range for a physiological variable that the body tries to maintain.

Question 19

Which of the following is a correct statement about the structure of DNA?

Accepted Answer

DNA consists of paired strands coiled in a double helix.

Question 20

A person is unable to maintain a stable internal environment and experiences frequent fluctuations in body temperature, blood pressure, and glucose levels. Which term best describes this condition?

Accepted Answer

Homeostatic imbalance

Levels of Organization, Homeostasis, and Comparison of RNA and DNA in Anatomy & Physiology

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