6. If the allele for brown eye colour (B) is dominant over the allele for blue eye colour (b), which of the following genotypes would a person with blue eyes have
bb
BB
Bb
bB
7. Blood is pumped to the lungs via
the aorta
the vena cava
the pulmonary arteries
the pulmonary veins
8. Diffusion of gases is the transfer of molecules
from an area of high concentration to an area of low concentration
from an area of low concentration to an area of high concentration that requires cellular energy
from an area of low concentration to an area of high concentration
from an area of high concentration to an area of low concentration that requires cellular energy
9. A red blood cell that is placed in a hypertonic solution
loses water
gains water
remains the same
produces more haemoglobin
10. Which statement best reflects the composition of atmospheric air at sea level?
oxygen 21%, carbon dioxide 0.04%, nitrogen 78%
oxygen 24%, carbon dioxide 0.01%, nitrogen 76%
oxygen 18%, carbon dioxide 0.01%, nitrogen 81%
oxygen 15%, carbon dioxide 0.04%, nitrogen 85%
11. mitochondria
have inner and outer membranes
all of the above
contains DNA
have inner folds called cristae
12. The inner lining of the heart is known as;
myocardium
endocardium
pericardium
septum
13. tidal volume is;
respiratory volume inhaled and exhaled during normal breathing
the amount of exchangeable air
the amount of air that can still be exhaled (forcibly) after a normal exhalation
air in respiratory passages that does not contribute to gas exchange
14. Heart valves permit blood flow in;
one direction, backwards
one direction, forewards
two directions, backwards and forewards
stop blood flow in any direction
15. When a variation outside normal limits triggers a response that restores the normal condition, the regulatory mechanism involves
compensation
adaptation
negative feedback
positive feedback
16. contraction of the heart muscle is called
systole
venous return
diastole
asystole
17. Identify the correct sequence of the organs of the respiratory passageway
