cells🔬

Question 1

transmission electron microscope magnification

Answer 1

x500 000

Question 2

resolution definition

Answer 2

see detail, ability to distinguish between 2 objects

Question 3

why do mitochondria look different in microscope

Answer 3

• mitochondria vary in shape

- cut in different angles

Question 4

how does cytoskeleton allow movement of organelles

Answer 4

microtubules

Question 5

how to ensure chromatography goes well

Answer 5

• clip paper onto rod to sit on top of beaker to keep it at a constant height
• repeat and find mean Rf to improve acccuracy
• place lid over beaker to prevent evaporation
• spots on separate papers to prevent clashing

Question 6

difference between electron and laser confocal scanning microscopes

Answer 6

lcsm has lower resolution
can see different layers and movement
fluorescent tag

Question 7

how can you tell cells are in prophase

Answer 7

• chromosomes condensed
• not organised
• no visible nucleolus

Question 8

how does organsiation of homologous chromosomes in metaphase 1 create variation

Answer 8

• independent assortment
• homologous chromosomes have different alleles
• homologous chromosomes line up on equator
• chromosomes in pair are randomly assigned to either pole

Question 9

ethical issues with embryonic stem cells

Answer 9

embryo is destroyed

embryo cannot consent

Question 10

function of a ring of contracting protein around centre of bacteria

Answer 10

cell division/cytokinesis

Question 11

function of protein which makes bacteria curved

Answer 11

maintains cell shape