Questions Corrections 2018 Flashcards
Explain why a person with AIDS may take longer than a healthy person to recover from a salmonella infection
Immune system is already damaged
So white blood cells cannot kill bacteria as effectively
Three substances transported in blood plasma
Urea
Carbon dioxide
Water
Two blood vessels that carry deoxygenated blood
Pulmonary artery
Vena cava
Which type of blood vessels carries blood into the right atrium
Veins
Explain how a deficiency of magnesium could cause symptoms of yellow leaves and stunted growth
Yellow leaves due to lack of chlorophyll
So less light absorbed so slower rate of photosynthesis
Therefore plant makes less glucose
So converts less glucose into protein
What molecule are genes made of
DNA
function of cell membrane
Controls the movement of substances in and out of the cell
Mucus can block the duct leading from pancreas to small intestine
Explain why children with CF (body produces excess mucus) grow more slowly than children without CF
Fewer digestive enzymes enter small intestine
So enzymes break down less food so there less absorption of nutrients, less glucose can enter blood stream, so fewer amino acids can enter blood stream so less protein is made
Describe how scientists may use stem cells to create healthy lungs that are not rejected by the CF patient
Take stem cells from patient
Remove CF gene
Create embryo using these stem cells
Remove stem cells from embryo and allow them to divide into lung cells
Describe how a student could test cows milk to show wether it contains protein and different types of carbohydrates
Biuret reagent tests for protein
Add biuret reagent to milk
Solution will turn lilac if positive
Iodine solution tests for starch
Add iodine solution to milk
Solution will turn blue black of positive
Benedict reagent tests for sugars
Add Benedict reagent to milk and heat
Solution will turn red brown if positive
