Cells Random Retrieval

A doctor vaccinated a group of patients against poliomyelitis. He gave each patient two doses of vaccine, 3 months apart. Calculate the percentage increase in the mean concentration of antibodies in blood between samples 2 and 3.

Which type of cell activates other immune cells in an immune response?

In the above experiment, why would the student be advised to take repeat readings?

When investigating osmosis, why is it better to calculate the percentage change in mass, rather than just the change in mass?

In the above diagram of three cells, will water move from:

In the above diagram of three cells, will water move from :

What is the water potential of pure water?

In the above diagram, there are three membrane proteins: A, B and C. Which represents where facilitated diffusion occurs?

Which part of the phospholipid bilayer prevents sodium ions leaving via simple diffusion?

Why can't glucose diffuse directly through the phospholipids?

Beetroot is a purple vegetable, the cells of which contain a pigment called Betalain. 4 tubes are set up with water and beetroot incubated at different temperatures: 20, 40, 60 and 80 ⁰C. which tube would you predict shows beetroot incubated at 20 ⁰C?

What substance will structure C be made out of?

If you were to investigate mitosis in plant tissue, which part of a plant would you choose to look at?

Which phase of mitosis is when the chromosomes condense?

Name the organelles which produce the spindle fibres. ( Spell it correctly)

Which type of electron microscope produced this image?

Which type of electron microscope show the density of the specimen as a dark patch?

How are the circular chromosomes separated in prokaryotic reproduction?

True or False: The circular chromosome can only replicate once per division, but the plasmids can replicate multiple times.

What is the function of this organelle?