Which of the following statements describes the function of the heart?
A. The heart produces white and red blood cells.
B. The heart controls the nervous system.
C. The heart makes oxygen and carbon dioxide.
D. The heart pumps blood throughout the body.
Select your answer:

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Biological Molecules › ViewWhich of the following could make one protein different to another protein?
I. the number of amino acids it contains
II. the sequence of amino acids
III. they contain amino acids
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
Vision and Hearing Defects › View
How does the mechanism of myopia lead to blurry distant vision?
A. The cornea flattens, spreading the light too wide on the retina.
B. The lens loses its elasticity, failing to properly focus light.
C. The eyeball elongates, causing light rays to focus before reaching the retina.
D. The retina moves closer to the lens, distorting the light focus.