Q: Which of the following equations correctly represents the overall process of aerobic cellular respiration?

$$\text{Glucose} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{ATP} + \text{Heat}$$

Question 1

A 9th grader presents with extreme thirst, frequent urination, fatigue, and rapid weight loss. Her labs show blood glucose \u003e500 mg/dL, high urine ketones, and low pH. Which metabolic process is primarily disrupted in this scenario, and why does this lead to ketoacidosis?

Accepted Answer

Insulin deficiency prevents glucose uptake, forcing cells to catabolize fats and proteins, producing ketones and acidosis.

Question 2

Which of the following best describes the difference between catabolic and anabolic reactions?

Accepted Answer

Catabolic reactions break down larger molecules into smaller ones, releasing energy; anabolic reactions use energy to build larger molecules from smaller ones.

Question 3

During cellular respiration, how many molecules of ATP are typically produced from the complete aerobic catabolism of one molecule of glucose?

Accepted Answer

$$30-32$$

Question 4

Which of the following equations correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

$$	ext{Glucose} + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O} + 	ext{ATP} + 	ext{Heat}$$

Question 5

Why does the nervous tissue require a continuous supply of glucose?

Accepted Answer

It cannot metabolize lipids or proteins for energy and relies almost exclusively on glucose.

Question 6

Which process describes the synthesis of glucose from non-carbohydrate sources, such as amino acids or glycerol?

Accepted Answer

Gluconeogenesis

Question 7

A patient is fasting for several days. Which metabolic process is most likely to be active, and what is a potential risk if this state is prolonged?

Accepted Answer

Ketogenesis; risk of ketoacidosis

Question 8

Which of the following statements about lipid metabolism is correct?

Accepted Answer

Beta-oxidation breaks fatty acids into 2-carbon fragments that enter the citric acid cycle as acetyl-CoA.

Question 9

Which lipoprotein is considered 'good cholesterol' and why?

Accepted Answer

HDL, because it returns excess cholesterol from tissues to the liver for excretion.

Question 10

Which of the following best explains why protein catabolism is not a preferred energy source?

Accepted Answer

Proteins are the main structural and functional components of cells, are harder to break down, and produce toxic ammonium ions.

Question 11

Which process converts the amino group of an amino acid into a less toxic compound for excretion?

Accepted Answer

Deamination followed by the urea cycle, producing urea

Question 12

Which hormone is released by adipose tissue during the absorptive state and acts to suppress appetite?

Accepted Answer

Leptin

Question 13

A person consumes 2,500 kcal per day but only expends 2,000 kcal per day. According to the energy balance equation, what is the likely outcome?

Accepted Answer

Weight gain due to positive energy balance

Question 14

Which of the following is a correct statement about basal metabolic rate (BMR)?

Accepted Answer

BMR is the rate at which the body expends energy at rest.

Question 15

Which of the following mechanisms is the most effective for heat loss from the body in a cool indoor environment?

Accepted Answer

Radiation

Question 16

Which vitamin classification is correct?

Accepted Answer

Vitamin D is fat-soluble.

Question 17

A patient with marasmus is most likely suffering from which of the following?

Accepted Answer

Lack of all nutrients

Question 18

Which trace element is essential for thyroid hormone synthesis?

Accepted Answer

Iodine

Question 19

Which of the following best describes the role of coenzymes in cellular energetics?

Accepted Answer

They accept and transfer electrons during oxidation-reduction reactions.

Question 20

Which hormone is released by the stomach and stimulates appetite?

Accepted Answer

Ghrelin

Metabolism, Nutrition, and Energetics: Study Notes for Anatomy & Physiology

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