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Chapter:

30+ GI-Digestion-Absorption-Metabolism Solved MCQs

in Physiology

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Biology .

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Chapter: GI-Digestion-Absorption-Metabolism
1.

Vitamins co-transported with Na+ include all EXCEPT:

A. thiamine
B. folate
C. niacin
D. riboflavin
E. pyridoxine
Answer» B. folate
discuss
2.

Fat soluble vitamins include all EXCEPT:

A. vitamin A
B. vitamin C
C. vitamin D
D. vitamin E
E. vitamin K
Answer» B. vitamin C
discuss
3.

The largest daily volume of secretions in the GIT originates in the:

A. salivary glands
B. stomach
C. gallbladder (bile)
D. pancreas
E. intestine
Answer» B. stomach
discuss
4.

Iron:

A. most dietary iron is in the ferrous state
B. most iron is absorbed in the upper small intestine
C. a ferritin micelle contains 1,000 atoms of iron
D. 90% of body iron is in haemoglobin
E. 10% of dietary iron is normally absorbed
Answer» B. most iron is absorbed in the upper small intestine
discuss
5.

Ketone bodies:

A. are not formed under normal conditions
B. are all moderately strong acids
C. are formed when intracellular glucose is deficient
D. are easily metabolised in the liver
E. all of the above
Answer» C. are formed when intracellular glucose is deficient
discuss
6.

Creatinuria can occur in all EXCEPT:

A. healthy children
B. pregnant women
C. starvation
D. hypothyroidism
E. poorly controlled diabetes mellitus
Answer» D. hypothyroidism
discuss
7.

Cations in normal (fasting) gastric juice include all EXCEPT:

A. Na+
B. Ca++
C. K+
D. Mg++
E. H+
Answer» B. Ca++
discuss
8.

Human hepatic bile (hepatic bile duct) is largely:

A. water
B. bile salts
C. bile pigment
D. cholesterol
E. lecithin
Answer» A. water
discuss
9.

The nutritionally essential amino acids include:

A. alanine
B. cysteine
C. tyrosine
D. methionine
E. glutamine
Answer» D. methionine
discuss
10.

The largest glycogen store in the adult body is in the:

A. liver
B. spleen
C. muscle
D. pancreas
E. circulating red cell mass
Answer» C. muscle
discuss
11.

TSH secretion is stimulated by:

A. dopamine
B. somatostatin
C. cold temperatures
D. stress
E. glucocorticoids
Answer» C. cold temperatures
discuss
12.

Thyroxine (T4) has greater affinity for:

A. thyroxine-binding globulin
B. transthyretin
C. thyroxine-binding pre-albumin
D. albumin
E. triiodothyronine
Answer» A. thyroxine-binding globulin
discuss
13.

GLUT is an example of:

A. simple diffusion
B. facilitated diffusion
C. primary active transport
D. secondary active transport
E. endocytosis
Answer» B. facilitated diffusion
discuss
14.

The most common cell type of the endocrine pancreas is:

A. A cells
B. B cells
C. C cells
D. D cells
E. F cells
Answer» B. B cells
discuss
15.

Both insulin and somatostatin:

A. are released from extra-pancreatic sites
B. receptors are linked to G proteins
C. inhibit release of glucagon
D. cause K+ uptake by cells
E. are polypeptides containing two chains linked by disulphide bonds
Answer» C. inhibit release of glucagon
discuss
16.

Aldosterone is secreted by:

A. zona reticularis
B. zona fasciculata
C. zona glomerulosa
D. zona fasciculata and reticularis
E. zona glomerulosa and fasciculata
Answer» C. zona glomerulosa
discuss
17.

Regarding aldosterone:

A. it is released in response to hypokalaemia
B. it has glucocorticoid action
C. it works via G proteins to increase Na+ reabsorption
D. its release results in alkaline urine
E. it is highly protein-bound
Answer» B. it has glucocorticoid action
discuss
18.

Calcitonin secretion is increased by:

A. gastrin
B. CCK
C. secretin
D. glucagon
E. all of the above
Answer» E. all of the above
discuss
19.

All of the following bind to intracellular receptors EXCEPT:

A. cortisol
B. aldosterone
C. 1,25-DHCC
D. parathyroid hormone
E. thyroxine
Answer» D. parathyroid hormone
discuss
20.

How many trophic hormones does the anterior pituitary produce?

A. 2
B. 3
C. 5
D. 6
E. 8
Answer» C. 5
discuss
21.

All of the following are high energy phosphate compounds EXCEPT:

A. adenosine triphosphate
B. glucose 6-phosphate
C. creatine phosphate
D. adenosine diphosphate
E. guanosine triphosphate
Answer» B. glucose 6-phosphate
discuss
22.

Under aerobic conditions, 1mol glucose forms:

A. 2mol ATP
B. 8mol ATP
C. 16mol ATP
D. 38mol ATP
E. 42mol ATP
Answer» D. 38mol ATP
discuss
23.

The approximate ratio of fat : CHO energy stores is:

A. 2 : 1
B. 4 : 1
C. 10 : 1
D. 20 : 1
E. 40 : 1
Answer» E. 40 : 1
discuss
24.

Nutritionally essential amino acids include:

A. glycine
B. serine
C. lysine
D. glutamine
E. tyrosine
Answer» C. lysine
discuss
25.

Uric acid is formed by the breakdown of:

A. purines
B. pyrimidines
C. glutamine
D. urea
E. all of the above
Answer» A. purines
discuss
26.

The LDL contains which aproprotein?

A. A
B. B-48
C. B-100
D. C
E. E
Answer» C. B-100
discuss
27.

Regarding cellular metabolism of cholesterol:

A. it inhibits HMG-CoA red???
B. is processed in part to other cholesterol esters by the enzyme acetyl CoA ??? acyltransferase
C. it inhibits the formation of CO2 receptors
D. all of the above
E. none of the above
Answer» D. all of the above
discuss
28.

Which of the following substances decreases the activity of hormone-sensitive lipase?

A. adrenaline
B. thyroxine
C. serotonin
D. TSH
E. prostaglandin E
Answer» E. prostaglandin E
discuss
29.

Chromium deficiency leads to:

A. insulin resistance
B. hypogondal dwarfism
C. anaemia
D. changes in ossification
E. thyroid disorder
Answer» A. insulin resistance
discuss
30.

Vitamin B1 (thiamine) deficiency leads to:

A. anaemia
B. beri beir
C. convulsions
D. dermatitis
E. pellagra
Answer» B. beri beir
discuss

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