Nokea
The cells of the proximal convoluted tubule are specialised to absorb compounds back into the circulatory system. In what way?
- A. They have foot processes which wrap around the blood vessels
- B. They have pores to allow compounds through
- C. They have microvilli to increase surface area
- D. They have cilia to help the filtrate move through the tube
Correct Answer: C
Rationale: Microvilli increase the surface area for reabsorption in the proximal convoluted tubule.
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Which of the following enzyme is secreted by pancreas -
- A. Maltase
- B. Trypsin
- C. Rennin
- D. Lactase
Correct Answer: B
Rationale: Trypsin, a proteolytic enzyme, is secreted by the pancreas.
Brunner's glands are located in :
- A. Oesophagus
- B. Duodenum
- C. Intestine
- D. Stomach
Correct Answer: B
Rationale: Brunner's glands are specifically found in the duodenum.
Enzyme maltase in human gut acts on food at a pH of -
- A. More than 7 to change starch into maltose.
- B. Less than 7 to change starch into maltose.
- C. More than 7 to change maltose into glucose.
- D. Less than 7 to change maltose into glucose.
Correct Answer: C
Rationale: Maltase works in the small intestine (pH > 7) to convert maltose into glucose.
Which element in the molecule of urea shows that it is formed from amino acids and not from glucose?
- A. carbon
- B. hydrogen
- C. nitrogen
- D. oxygen
Correct Answer: C
Rationale: Nitrogen is a key component of amino acids and is retained in urea during deamination.
Teeth adapted to shear food are:
- A. premolars
- B. canines
- C. incisors
- D. molars
Correct Answer: C
Rationale: Incisors are sharp-edged teeth designed for cutting or shearing food.