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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*** 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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