Unit 1 Revision Cards

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What can ethanol do to the membrane?
denature the proteins in the membrane
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What happens to the phospholipids in ethanol?
They dissolve
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What happens to the vacuole membrane?
It can be disrupted so the betalain can leak out
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What could affect the results of the experiment?
It might not have been rinsed properly, or the colorimeter might not have been calibrated.
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What does diffusion involve?
small and or non polar lipid soluble molecules
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for example?
oxygen and carbon dioxide
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How do these molecules move?
directly through the phospholipid bilayer
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How is this movement?
passive
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What is the net movement?
down a concentration gradient
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What protein does facillitated diffusion involve?
a channel protein
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What molecules move through the layer?
polar molecules
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What does active transport need?
energy from the breakdown of ATP
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Hoe does active transport travel?
up a concentration gradient
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what protein is required?
carrier
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What is meant by a template strand?
RNA nucleotides bind to this strand, mRNA is built along this strand
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What happens to a cell membrane with heat?
increased kinetic energy which increases movement of moolecules
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What moves?
phospholips
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what are denatured?
membrane proteins
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When is there more denaturation?
at 40 degree celsius
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What can escape from the cell?
Betalain when the membrane is disrupted
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What is an ethical issue of prenatal scanning?
Chance of miscarriage, killing is wrong
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What is a social issue of pre-natal scanning?
Confidentiality of parents/child, paternal dna might not match.
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How is the dipolar nature of water essential for living organism?
Water is a solvent, water can allow cohesion - high surface tension, , hydrogen bonds holding water, high specific heat capacity and distribution of thermal energy around the body
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What is one difference between mrna and trna?
mRNA contains a codon whereas tRNA has an anticodon
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What is another difference between mRNA and tRNA?
tRNA has hydrogen bonds holding the structure together whereas mRNA does not
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What is the definition of risk?
probability of the occurance of an unwanted event or outcome.
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What are two things which could effect the perception of risk?
Peer pressure and own experience
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What is a gene?
A sequence of bases on a DNA molecule that codes for a sequence of amino acids in a polypeptide chain
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What is cytosine and Thymine known as?
Pyridimides
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What is guanine and adenine?
Purine
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What happens during atrial systole?
the atrium contract and the ventricles are relaxed.
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What valve opens?
atrioventricular valves
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During ventricular systole what opens?
semi lunar valves
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Where is oxygenated blood forced through?
the aorta to the body
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and where does the deoxygenated blood go through?
pulmonary artery to the lungs
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What is the first main structure of the aorta?
thick wall
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Why does it need this?
avoid rupture/ withstand high pressure
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What is elastic layers needed for?
control the flow of blood
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What is the smooth endothelial wall needed for?
reducing friction
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What valve is present in the base of the aorta?
Semi lunar valve
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What does this prevent?
back flow
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Other cards in this set

Card 2

Front

What happens to the phospholipids in ethanol?

Back

They dissolve

Card 3

Front

What happens to the vacuole membrane?

Back

Preview of the front of card 3

Card 4

Front

What could affect the results of the experiment?

Back

Preview of the front of card 4

Card 5

Front

What does diffusion involve?

Back

Preview of the front of card 5
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