AQA Biology Unit 5

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What is meant by homeostasis?
Maintaining a constant internal environment
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How does insulin affect blood glucose levels?
Lowers blood glucose levels
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Where are the receptors that detect a rise in temperature?
Hypothalamus
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Why is a gene longer than the resulting mRNA?
mRNA contains only exons
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What bond is between amino acids
Peptide bond
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Name the enzyme used to convert mRNA into cDNA
Reverse Transcriptase
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Name the enzyme used to cut a gene
Restriction Endonuclase
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What is a Codon?
Three unpaired bases on mRNA that code for an amino acid
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Define degenerate
An amino acid can be coded for by more than one triplet
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What is the role of RNA polymerase in transcription?
Join RNA nucleotides together to form a strand with phosphodiester bonds
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Where are adult stem cells found?
Bone marrow
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Which is a difference between mRNA and tRNA?
tRNA as hydrogen bonds, mRNA doesnt
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What is recombinant DNA?
Sections of DNA from two species
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What is meant by refractory period?
No new action potentials produced in this time
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Describe how hormones and local chemical mediators reach the cells they affect
Hormones in the blood, L.C.M spread by diffusion.
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How do impulses move along a mylinated neauron
Impulses jump between gaps in the axon known as node of ranvier
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Why do cone cells have a higher level of visual acuity?
Each cone cell is conneted to an individual neurone
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How is resting potential established in an axon?
Active transport of sodium ions out of an axon
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How does mRNA move out of the nucleus?
Through a nuclear pore
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What is the role of troponin?
To bind to Calcuim ions causing tropmyosin to move, exposing actin binding sites
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When the sarcomeres contract what happens to the length of the I band?
It decreases
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What is an antigen?
A protein on the cell surface membrane triggering an immune response
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How does panting lead to heat loss?
Evaporation of water from the lining of the mouth, heat transferred from blood
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Define Taxis
A movement that bares some relationship to the location of the stimulus
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Define Tropism
A growth movement of part of a plant in response to a directional stimulus
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Define Kinesis
A non-directional response to a stimulus
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Other cards in this set

Card 2

Front

How does insulin affect blood glucose levels?

Back

Lowers blood glucose levels

Card 3

Front

Where are the receptors that detect a rise in temperature?

Back

Preview of the front of card 3

Card 4

Front

Why is a gene longer than the resulting mRNA?

Back

Preview of the front of card 4

Card 5

Front

What bond is between amino acids

Back

Preview of the front of card 5
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Indiaistrying

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sass master, good quiz though thank you

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