Photosynthesis
What organelle is the site of photosynthesis?
Chloroplast
What part of blood is responsible for clotting?
Platelets
Which biological molecule is made up of amino acids?
Protein
What is the mechanism that reverses a change to bring conditions back to set point?
Negative feedback
Where in the small intestine do most nutrients get absorbed?
Ileum
State the word equation for photosynthesis.
Carbon dioxide + water --> glucose + oxygen
Which vessel brings blood to the heart from the lungs?
Pulmonary vein
Name the elements in carbohydrates.
Carbon, hydrogen, oxygen
Which hormone increases blood glucose levels?
Glucagon
What enzymes break proteins down into amino acids?
Pepsin and trypsin
Name two factors that affect the rate of photosynthesis
Light intensity / conc. of carbon dioxide / temperature
Why do arteries have a smooth internal lining?
To reduce friction as blood flows
Describe the test for starch and its results.
Add iodine solution; a blue-black colour indicates starch
Which part of the brain contains the thermoregulatory centre?
Hypothalamus
What do molars do to food while chewing?
Grind and crush food
How does a deficiency in magnesium affect plants?
Reduces chlorophyll production
What happens to fibrinogen when a blood vessel is damaged?
It is converted into fibrin
What is the definition of a polymer?
A polymer is a large molecule made up of many smaller units called monomers, joined together by chemical bonds.
What effect does insulin have on liver cells?
They take up glucose and convert it into glycogen
Bile breaks large globules of oil into small droplets. What's it's other job in the duodenum?
Bile neutralises stomach acid and provides optimum pH 8 for enzymes to act
Which layer of a leaf contains chloroplasts?
Explain the role of 2 types of white blood cells in the immune system
Phagocytes - phagocytosis
Leucocytes - production of antibodies
Explain how DCPIP is used to test juices for vitamin C concentration.
Count number of drops of juice it takes to turn DCPIP from dark blue to pink/transparent.
What blood vessels constrict when body temperature decreases?
Arterioles
What diffuses into the lacteals in villi?
Fatty acids and glycerol