Red
Name a food that would give a positive result for Benedicts and Iodine but a negative result for Biuret and ethanol.
Iced bun
If lactic acid is formed from splitting a glucose molecule in half what is the formula for lactic acid?
C3H6O3
What was the limiting factor for growth of my lawn yesterday?
CO2 concentration
A microscope makes a cell with a length of 2um look 4mm long. If the eyepiece is 10X how large was the objective?
200
3 differences between xylem and phloem
X hollow tubes P Sieve plates
X Water P Sugar solution
X Up P Up/down
X transpiration P Translocation
You move a lamp 4 times further away from some pond weed. What ideally would happen to the rate of photosynthesis?
1/16th
Inverse square law
What is an advantage and disadvantage of mechanical AND biological heart valves? 4 answers
B - Rejection, wear out
Less clots
M - Clots require medication, damage blood cells
Unlimited supply, long lasting
What is usual measurement for the rate of reaction of photosynthesis?
cm3/second
cm3/minute
Electron microscopes have a much better resolution and magnification. Suggest why we don't use them all the time.
More expensive
Hard to prepare samples
Black and white
Sample must be dead
Anaemia is a lack of iron that reduces the number of red blood cells. Explain how and why this would affect someone affected.
Less oxygen
Less respiration
Less energy released
Tired
What drugs are used to treat HIV?
Why were they so difficult to develop?
Anti-retroviral drugs
Viruses live inside cells
What was the first (commonly used) drug to have a double-blind trial carried out on it? 1907
Caffeine
Name three precautions you should take take in order to carry out aspetic technique
Wash hands
Clean area
Flame loop
Boil agar/growth media
Bunsen to cause an updraft
Limit time of exposure
Sammy breaks their leg and can't walk for 3 months. Name 2 other health conditions that could occur as a result.
Depression
Obesity
What is present on the surface of cells that causes an organ to be rejected and what detects the foreign organ?
Antigens
Antibodies
Name a bacterial STI that is becoming resistant to antibiotics
What is the main reason for these bacteria becoming resistant?
Gonorrhea
Over prescription
Not finishing the course
5 symptoms of plant disease
Rot
Growths
Discolouration
Malformed leaves
Infestation by pests
Poor growth
Name three sub-cellular structures that a prokaryotic cell doesn't have.
Mitochondria
Chloroplasts
Nuclei
At what two times today (approx) will the CO2 production by respiration and uptake by photosynthesis be the same?
5-8am
7-11pm
Where are the two things required for fat digestion and what are the two products?
Lipase
Bile
Fatty acids
Glycerol
What is the main reason for using healthy volunteers in clinical trials?
What is the main reason to do a double-blind trial?
Toxicity
Reduce bias/show efficacy
Name an antiseptic oil made by plants that we can also use
Tea tree
Pine
What is the zone of inhibition of antibiotic if it has a radius of 4cm?
50cm2
A leaf in a dry habitat will have what 2 main adaptations to its structure?
Less stomata
Thicker epidermis
Waxy cuticle
The lungs and small intestine are both well adapted for exchanging materials quickly.
Give two similarities and two differences between these adaptations
SI Diffusion and active transport Vill
Lungs Diffusion only, Alveoli, ventilated
Large surface area, walls that are one cell thick, good blood supply, short diffusion pathway, steep conc gradient