June 2014 Flashcards
1
Q
Why is the genetic code described as universal
A
The same triplet code for the same amino acid in all organisms
2
Q
What is the maximum number of different DNA triplets that can be made using the 4 bases
A
64
3
Q
Explain how a myelinated axon conducts impulses faster than a non-myelinated axon
A
Action potential only at node
Nerve impulses jump from node to node
So impulses don’t travel along the whole length
4
Q
Explain how the formation of glycogen leads to a lowering of blood glucose concentration
A
Glucose concentration falls in cells
So concentration higher in blood than cell
This creates concentration gradient
So glucose enters the cell by diffusion
