biology

Question 1

what is a bundle of neurones known as

Answer 1

nerve

Question 2

LH role

Answer 2

matures ovum and releases egg

Question 3

zygote

Answer 3

diploid contains 46 chromosomes

Question 4

what can increase speed of transmission in a motor neurone

Answer 4

the high density of sodium channels, nodes of Ranvier, insulating myelin sheath and greater axon diameter.

Question 5

recombinant dna

Answer 5

are molecules of DNA from 2 different species

Question 6

what can ADH deficiency lead to

Answer 6

can lead to low blood pressure

Question 7

gene technology for replication

Answer 7

1)useful gene is cut from DNA using a restriction enzyme which breaks the bonds between nucleotides
2)restriction enzymes cut DNA in a staggered way leaving short sections of single-stranded DNA called sticky ends
3)bacterial plasmid dna is cut open using a restriction enzyme which also have sticky ends
4)useful gene and DNA mixed and gene inserted into plasmid
5)enzyme DNA ligase joins plsmid DNA and other useful genes together . Plasmid is called recombinant plasmid
6)recombinant plasmid inserted into GMO

Question 8

FSH LH OESTROGEN AND PORGESTERONE

Answer 8

FSH-causes the egg to mature
estrogen-makes the lining thickens
LH-stimulates release of an egg
progesterone-maintains lining

Question 9

adh

Answer 9

when more adh is produced less urine is made as water is reabsorbed
when less adh is produced less water is reabsorbed so more urine made