GAMSAT Practice Questions- Section III

Reasoning in the Biological and Physical Sciences

Questions 1-3 (Allow 5 minutes to complete this section of the mini-exam)

In the human body the speed of blood through the arterial pathway generally decreases with the distance from the heart.

GAMSAT Practice Question S3 Blood flow g

For questions where the acceleration is constant or approximately constant, the following equations may be helpful:-

GAMSAT Practice Question S3 Equations of

Where s = distance from origin, u = initial velocity, v = final velocity, a = acceleration, and t = time.

1.            The blood flow between the points B and C slowed at a rate of




2.            The best of the following estimates of the time that the blood took to travel between points B and C is


A             0.5 secs                                                C             2.5 secs

            1.5 secs                                                            3.5 secs


 3.            Illustrated below are possible velocity vs. time graphs for blood flow. The shaded area is also given. Which of the graphs below most accurately describes the velocity of blood flow through the arterial pathway?

GAMSAT Practice Question S3 Acceleration
GAMSAT Practice Question S3 Blood flow A

Questions 4-5 (Allow 3 minutes to complete this section of the mini-exam)

A carbon is covalently bonded to 4 different atoms or groups of atoms (designated Red, Green, Blue and Yellow)

GAMSAT Practice Question S3 Stereoisomer

4.            Which of these structures cannot be superimposed on any of the others?


A             I                                                                           III

            II                                                                         IV



5.            Which of the following statements is false?


A             I and III are not diastereomers

B             I and II are not superimposable

C             I and II are chiral enantiomers

D             III and IV are enantiomers

Questions 6-8 (Allow 5 minutes to complete this section of the mini-exam)

Growth hormone (GH) is secreted by the anterior pituitary gland in the brain and has actions on a variety of body tissues. The secretion of growth hormone is regulated primarily by the neurosecretory nuclei of the hypothalamus. These cells release the peptides Growth Hormone Releasing Hormone (GHRH) and Growth Hormone Inhibiting Hormone (Somatostatin). GH release is determined primarily by the balance of these two peptides which in turn is affected by many physiological stimulators (e.g. exercise, nutrition, sleep) and inhibitors (e.g. free fatty acids) of GH secretion.

GAMSAT Practice Question S3 Growth hormo

In the figure above:


  • The names of structures are circled

  • The names of hormones are shown in bold text

  • + denotes a positive or increased effect on production/ response

  • - denotes a negative or decreased effect on production/ response


6.    Which of the following is a consequence of increased somatostatin production by the hypothalamus?

            Reduced muscle growth

B             Increased bone growth

            Increased ghrelin production

D             Increased IGF-1 levels


7.    Which of the following is affected most directly by negative feedback?

A             Liver


            Anterior pituitary

D             Adipose tissue


8.     Increased fat mass (reduced lipolysis)  could be caused by:

            Poor sleep

B             High GHRH levels

C             High ghrelin levels

D             Low somatostatin levels

How did you go?

Do you need an MCQ strategy for difficult questions? Do you need to develop an approach to equation of motion questions?  Want to learn a simple strategy for thinking about stereoisomers? Or did you run out of time? Get Newton to Medicine- our Section III GAMSAT Study Manual. This manual includes HUNDREDS of GAMSAT Practice questions for section III;  The best way to improve your section III mark is to LEARN by DOING as many GAMSAT-style questions as you can. USE multiple choice technique. USE simple approaches such as “Calculation” and “Comparison” (We show you Two Methods for Approaching Section III Questions). Learn ACTIVELY. Learn from your mistakes. Learn a way of thinking that will take you beyond scientific knowledge to scientific understanding.