MDCAT XII Biology Chemical Coordination Online Test-2

Instructions for MDCAT XII Biology Chemical Cordination Online Test-2:

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Test Details:

Subject: Biology
Class: 2nd year or 12
Chapter Name: Chemical Cordination
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

277

Created on April 13, 2025 By

medicoengineer.com

MDCAT XII Biology Chemical Coordination Online Test-2

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NameEmailPhone Number

1 / 50

1. Chemicals secreted by an organism in minute amounts to stimulate a reaction from another organism of the same species:

a) Neurotransmitter

b) Hormones

c) Pheromones

d) All

2 / 50

2. What does the term hormone mean?

a) Facilitate

b) Excite

c) Signal

d) Response

3 / 50

3. Which of the following statements about hormones is correct?

a) They are organic molecules

b) They convey information to their target cells

c) They resist destruction prior to reaching their target cells

d) All

4 / 50

4. Hormones composed of long chains of amino acids are:

a) Protein

b) Peptide

c) Peptone

d) Melatonin

5 / 50

5. Which of the following are protein hormones?

a) Insulin

b) Glucagon

c) Prolactin

d) All

6 / 50

6. Biogenic amine hormones are secreted by:

a) Adrenal medulla

b) Thyroid gland

c) Pineal gland

d) All

7 / 50

7. Hormone specificity is determined by:

a) Stimulus

b) Response

c) Receptors

d) Environment

8 / 50

8. The number of reactions in a cell caused by a single hormone signal includes:

a) Protein synthesis

b) Activation or inactivation of enzymes

c) Change in cell membrane permeability

d) Rates of mitosis and cell development

e) All

9 / 50

9. Which hormones alter the activity of genes?

a) Steroid

b) Protein

c) Thyroid

d) A and C

10 / 50

10. How long do steroid hormones take to exert their full effects?

a) Minutes to days

b) Minutes to hours

c) Minutes to weeks

d) Any of the above

11 / 50

11. Which of the following is not an endocrine gland?

a) Pituitary

b) Thyroid

c) Adrenal

d) Gastric

12 / 50

12. This gland secretes hormones into the extracellular fluid:

a) Endocrine

b) Exocrine

c) Sweat

d) Salivary

13 / 50

13. A set of neurosecretory cells in the hypothalamus exerts control over the anterior pituitary lobe by secreting how many kinds of hormones?

a) 6

b) 7

c) 2

d) 4

14 / 50

14. ADH and oxytocin are stored and secreted from the:

a) Hypothalamus

b) Posterior pituitary gland

c) Anterior pituitary gland

d) Kidney and uterus

15 / 50

15. The posterior pituitary gland appears ___, while the anterior pituitary is also called:

a) Glandular, neurohypophysis

b) Fibrous, adenohypophysis

c) Glandular, adenohypophysis

d) Fibrous, neurohypophysis

16 / 50

16. Several hormones of the anterior pituitary are collectively termed as:

a) Tropic

b) Tropins

c) A and B

d) Adenohormones

17 / 50

17. Which hormone stimulates the gonads for the production of steroid hormones?

a) FSH

b) Growth hormone

c) Estrogen

d) LH

18 / 50

18. Which hormone stimulates the mammary glands to produce milk?

a) Oxytocin

b) MSH

c) Estrogen

d) Prolactin

19 / 50

19. Thyroid-stimulating hormone (TSH) stimulates the thyroid to produce:

a) T3

b) Calcitonin

c) T4

d) All

20 / 50

20. Which of the following contains four atoms of iodine?

a) Calcitonin

b) Parathyroid hormone

c) Thyroxine (T4)

d) Insulin

21 / 50

21. ADH:

a) Prevents dehydration

b) Prevents urination

c) Increases permeability of water in the collecting duct

d) All

22 / 50

22. Oxytocin:

a) Aids in social interaction

b) Stimulates contractions to promote lactation

c) Affects human behavior

d) All

23 / 50

23. The thyroid is composed of two lobes and ___ binds them together:

a) Muscle

b) Fibers

c) Isthmus

d) Nerves

24 / 50

24. Regarding T4, which of the following is correct?

a) Less potent than T3

b) Elevates metabolic rate

c) increase heart rate

d) B and C

e) All

25 / 50

25. Profuse sweating, weight loss, heat intolerance, irritability, and high blood pressure are symptoms of:

a) Hyperthyroidism

b) Hypothyroidism

c) Cretinism

d) Addison's disease

26 / 50

26. Children born with hypothyroidism experience stunted growth and severe intellectual disability, a condition known as:

a) Goiter

b) Cushing’s syndrome

c) Cretinism

d) Goiter

27 / 50

27. Which of the following is true regarding goiter?

a) Caused by iodine deficiency

b) Due to shortage of thyroid hormone

c) Involves enlargement of the thyroid

d) All of the above

28 / 50

28. Parathyroid hormone (PTH) is synthesized and released in response to:

a) Low glucose levels in the blood

b) High calcium levels in the blood

c) Low calcium levels in the blood

d) High glucose levels in the blood

29 / 50

29. Which of the following is true about PTH?

a) Stimulates osteoclasts

b) Stimulates kidneys to reabsorb calcium

c) Maintains calcium levels

d) All of the above

30 / 50

30. Endocrine cells make up only __% of the total weight of the pancreas.

a) 1

b) 2

c) 5

d) 3

31 / 50

31. Which of the following is an autoimmune disorder?

a) Diabetes insipidus

b) Type 2 diabetes

c) Type 1 diabetes

d) Gout

32 / 50

32. Type 1 diabetes is treated by:

a) Glucagon injection

b) Insulin injection

c) Low carbohydrate diet

d) Low fat diet

33 / 50

33. Tropic hormones from the anterior pituitary directly affect the release of:

a) Parathyroid hormone

b) Calcitonin

c) Epinephrine

d) Thyroxine

34 / 50

34. Which of the following are synthesized from the amino acid tyrosine?

a) Epinephrine

b) Catecholamines

c) Thyroxine

d) All of the above

35 / 50

35. Prolactin is a hormone secreted by the:

a) Pituitary gland

b) Thymus gland

c) Thyroid gland

d) Adrenal gland

36 / 50

36. Deficient production of hormones by the thyroid gland results in:

a) Addison’s disease

b) Cushing’s syndrome

c) Cretinism

d) Graves’ disease

37 / 50

37. The hormones of which gland trigger alarm responses?

a) Thyroid

b) Adrenal

c) Parathyroid

d) Liver

38 / 50

38. Hormones from the adrenal cortex are all:

a) Proteins

b) Carbohydrates

c) Steroids

d) Minerals

39 / 50

39. Which hormone is involved in gluconeogenesis?

a) Androgen

b) Cortisol

c) Aldosterone

d) Mineralocorticoid

40 / 50

40. CRH (Corticotropin-Releasing Hormone) is produced by the hypothalamus in response to:

a) Stressful events

b) Trauma

c) Infection

d) All of the above

41 / 50

41. Muscle wasting, weakened bones, and mood swings are symptoms of:

a) Cushing’s syndrome

b) Addison’s disease

c) Cretinism

d) Diabetes

42 / 50

42. Which of the following is correct regarding testosterone?

a) Present in both males and females

b) Has anabolic effects like increased muscle mass and bone density

c) Has androgenic effects like growth of facial and axillary hair

d) All of the above

43 / 50

43. Estrogen contributes to:

a) Fat distribution in hips, legs, and breasts

b) Development of armpit and pubic hair

c) Onset of menstruation (menarche)

d) All of the above

44 / 50

44. Atrial natriuretic peptide is a hormone secreted by the:

a) Kidney

b) Stomach

c) Liver

d) Heart

45 / 50

45. Endorphins are involved in:

a) Stress relief

b) Pain relief

c) Excitement

d) Sleep regulation

46 / 50

46. Which gland is sometimes called the "third eye"?

a) Pineal

b) Thymus

c) Adrenal

d) Heart

47 / 50

47. Weight gain, lethargy, and cold intolerance in adults are symptoms of:

a) Hyperthyroidism

b) Hypothyroidism

c) Goiter

d) Cretinism

48 / 50

48. Which condition is associated with genetic history, obesity, stress, lack of exercise, and old age?

a) Diabetes insipidus

b) Type 1 diabetes

c) Type 2 diabetes

d) Diabetes mellitus

49 / 50

49. Which mechanism involves a hormone initiating an action that leads to further release of the same hormone?

a) Positive feedback

b) Negative feedback

c) Metabolic pathway

d) Negative cycle

50 / 50

50. Which hormone stimulates red blood cell production in the bone marrow?

a) Prostaglandin

b) Angiotensin

c) Erythropoietin

d) HCG (Human Chorionic Gonadotropin

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MDCAT XII Biology Chemical Coordination Online Test-2

Instructions for MDCAT XII Biology Chemical Cordination Online Test-2:

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