Nokea
In addition to active transport, which process is involved in absorbing food in the small intestine?
- A. pinocytosis
- B. excretion
- C. phagocytosis
- D. electrochemical diffusion
Correct Answer: A
Rationale: The correct answer is pinocytosis. Pinocytosis is a process where cells in the small intestine absorb nutrients by engulfing them. This process is different from phagocytosis, which involves engulfing large particles, and excretion, which is the removal of waste products. Electrochemical diffusion is not directly involved in the absorption of food in the small intestine.
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Which component of protein contains nitrogen?
- A. Amino group
- B. Carboxyl group
- C. Peptide bond
- D. Side chain
Correct Answer: A
Rationale: The correct answer is the amino group. Amino groups are functional groups found in amino acids, which are the building blocks of proteins. These groups contain nitrogen and are essential for the structure and function of proteins. The carboxyl group (choice B) contains carbon, oxygen, and hydrogen, while the peptide bond (choice C) is a covalent bond formed between amino acids in a protein chain. The side chain (choice D) refers to the unique chemical structure attached to the central carbon of an amino acid and varies among different amino acids, but it does not specifically contain nitrogen.
What is the process by which proteins are synthesized from the available amino acids?
- A. Gluconeogenesis.
- B. Deamination.
- C. Protein synthesis.
- D. Transamination.
Correct Answer: C
Rationale: The correct answer is C: Protein synthesis. This process involves the formation of proteins from amino acids to support various body functions. Gluconeogenesis (choice A) is the synthesis of glucose from non-carbohydrate sources, not protein synthesis. Deamination (choice B) is the removal of an amino group from an amino acid, not the synthesis of proteins. Transamination (choice D) is the transfer of an amino group from one molecule to another, not the direct synthesis of proteins.
The release of gastric secretions is stimulated by nerve and hormonal stimuli and the:
- A. ingestion of water.
- B. swallowing reflex.
- C. presence of food in the stomach.
- D. closing of the pyloric sphincter.
Correct Answer: C
Rationale: The correct answer is C: 'presence of food in the stomach.' Gastric secretions are stimulated when food enters the stomach, triggering nerve and hormonal responses. This process prepares the stomach for digestion. Choices A, B, and D are incorrect because ingesting water, swallowing reflex, and the closing of the pyloric sphincter do not directly stimulate the release of gastric secretions.
Which of the following is a source of complete protein?
- A. Cereal grains.
- B. Beans.
- C. Nuts.
- D. Eggs.
Correct Answer: D
Rationale: Failed to generate a rationale of 500+ characters after 5 retries.
What is the term for the action of biting, chewing, and breaking up ingested food into smaller particles?
- A. Peristalsis.
- B. Segmentation.
- C. Metabolism.
- D. Mastication.
Correct Answer: D
Rationale: The correct answer is D, 'Mastication.' Mastication is the mechanical process of chewing that breaks down food into smaller particles. Peristalsis (choice A) is the involuntary constriction and relaxation of muscles in the gastrointestinal tract that moves food along. Segmentation (choice B) is the mixing movement of the digestive system that helps to break down food and mix it with digestive juices. Metabolism (choice C) refers to the chemical processes that occur within a living organism to maintain life.