paper threeeee Flashcards

1
Q

how does water get out of the xylem?

A

water potential gradient due to evaporation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

for translocation

A
ringing experiments
respiratory poisons
stops moving up at night
sap 
companion sells have mitochondria
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

against translocation

A

solutes move at different speeds
movement at the same rate down the whole plant
sieve plates weird

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what are sink cells

A

respiring cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

why does the bohr effect happen

A

lower ph changes the shape of haemoglobin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

purpose of double circulatory system

A

allows pressure to be raised again after oxygenation so blood can get to organs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

name of outside heart blood vessels

A

coronary artery, cardiac vein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

diastole- valves

A

av open

sl closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

atrial systole- valves

A

av open

sl closed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

ventricular systole- valves

A

av closed

sl open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is tissue fluid made of

A

blood plasma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

why do arterioles have thicker muscle layers

A

controls movement into capillaries

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

other way for tissue fluid to return to the blood

A

lymph fluid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what changing shape does to bonds of substrate

A

distorts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

light-dependent reaction (5)

A
  • chlorophyll absorbs light- it is photoionised
  • some energy from photoionisation is conserved in the production of atp and nadph
  • some atp is also produced from chemiosmosis, using energy from the electron transfer chain
  • h+ are pumped into the thylakoid and catalyse atp synthase by moving out
  • photolysis of water produces protons, electrons (which enter the etc) and oxygen
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are schwann cells?

A

myelin-containing cells that provide electrical insulation/general protection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

where is myelin?

A

in the cell membranes of schwann cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

open at resting potential

A

k+ channels, net movement of na+ out of pump

overall negative inside positive outside (so it flips when action potentials arise)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

when do na+ channels close?

A

when +40mv potential has been established

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what causes hyper-polarisation?

A

outward transport of k+ through the channels that are able to close

21
Q

repolarisation

A

voltage-gated k+ channels shut, resting potential restored

22
Q

name for the node of ranvier thing

A

saltatory conduction

23
Q

greater axon diameter

A

increases speed of conductance due to less ion leakage

24
Q

types of summation

A

spatial- multiple neurones

temporal- high frequency of neurotransmitter release from one neurone

25
3 purposes of the refractory period
one direction only discrete impulses limits number of action potentials
26
action of an inhibitory synapse
- neurotransmitter causes chloride ion channels to open - cl- move in, also triggers k+ channels to open, so they move out - membrane potential drops - this hyperpolarisation makes it less likely that an action potential will be triggered
27
structures in the mitotic spindle
centrioles at the poles, fibres attach to centromeres of chromosomes
28
when do spindle fibres develop?
prophase
29
at what point do the chromatids become known as chromosomes again?
anaphase
30
what happens during binary fission after dna replication?
cell wall splits
31
root tip cells
totipotent stem cells in meristem
32
what do you do to the root tips in rp2?
add to hot acid to denature the enzymes involved in mitosis so cells stop dividing
33
how to focus a microscope
coarse then fine knob
34
what is done to dna before it is fingerprinted?
cut into fragments using restriction endonucleases
35
how are fragments seen in elecrophoresis?
attached to dna probes
36
how are dna fragments produced from rna?
mrna from cells that produce a lot of the protein converted to cdna using reverse transcriptase
37
how gene machines make dna fragments
small, overlapping sequences of nucleotides assembled and replicated using pcr
38
pros of pcr
- fast | - doesn't require living cell cultures
39
pros of vectors
- low risk of contamination due to the specific restriction endonucleases used - less mistakes- mutations are rarer than mistakes with pcr
40
step in adding genes to a plasmid that allows it to be replicated
adding promoter and terminal regions to allow binding of rna polymerase
41
what is required by the ribosomes during translation?
enzyme to catalyse the formation of the peptide bond, atp
42
what are genome and proteome defined in terms of?
cells
43
where is iaa produced?
tips of the root/shoot
44
what does a kinesis change?
speed and direction of movement
45
pathway for control of heart rate
receptor > medulla > nervous system > san
46
word to describe heart muscle
myogenic
47
movement of electrical impulse from avn
bundle of his > av septum > purkyne tissue bundles > impulse released
48
benefits of reflexes
- free up the brain for more complex processes - present from birth - helps avoid harmful stimuli