Biology Module 2 Flashcards
(19 cards)
Why reproducing asexually to form can be a disadvantage to living organisms including mammals
Clones can’t adapt because there is no variation
Why are embryonic stem cells useful in medicine
They can form up to 250 different variety’s which means they can be used to do many other things too
Each stem cell divides once every 30 mins. How many minutes would it take one stem cell to form 16 cells?
120 mins - draw diagram
The type of cell division taking place in the root
Mitosis
During cell elongation the root cells are…
Getting longer
What happens to root cells during cell differentiation
Root cell begin the specialise to form one another
What happens to cells as the baby grows?
The cells grow as the baby grows and produce more cells which get bigger
Another way of measuring growth, not mass
Height
At 10 months old, what percentage of boys have a mass of less that or equal to 8kg
9%
Order of mitosis letters
C, A, E, D, B
Total number of chromosomes you would expect to find in a human cell produced by mitosis
46 chromosomes
Where are chromosomes found before mitosis starts
Nucleus
2 things that must happen during interphase
Replicate DNA
Sequence of reflex arc
Stimulus, RECEPTORS , sensory neurone,cns, MOTOR NEURON, effector, response
2 sources of error in this method
Need to be at same height
Distance between finger and thumb
Role and importance of these cells in multi cellar organisms
Embryonic can specialise into all cells
Replace damaged tissues which helps repair other cells
When recovering from an injury as they replace the damaged cells
Name A B and C
A- nucleus
C- axon
Mean reaction time
63
Why does alcohol cause a change in reaction times
Slows down sending messages to the brain which results in slower reaction times
