Biology Year 13 Random Retrieval

What do we call it if the restriction enzyme cuts both strands of DNA in the same place?

What are iPS cells?

What is the difference between mRNA and pre-mRNA?

What type of mutation causes a sequence of bases to be moved from one location to another?

What is the position of gene on a chromosome called?

What is lichen made out of ?

Which stage represents lichen and mosses?

How many samples should you take to get reliable data?

Tay Sachs is a recessive disease which leads to the build up of certain lipids which eventually become toxic. The Cajun community in the USA has an incidence of about 1 in every 3,500 births. What is the allele frequency of the normal healthy genes?

Which part of the Hardy Weinberg equation represents the homozygous recessive individuals?

A codominant allele' is when both alleles are expressed. One breed of chickens can have Black feathers(B) or White feathers(W). What phenotype will a chicken have with the genotype BW ?

Dopamine is a neurotransmitter which has a role in numerous processes in the brain including pain relief. The release of dopamine can be stimulated by chemicals called endorphins produced in the brain. Endorphins attach to opioid receptors on presynaptic neurones that release dopamine. Morphine is a drug that has a similar structure to endorphins and can provide pain relief, explain how.

What the the tiny gaps called labelled X on the above diagram? ( Type your answer)

Which of the events (A - F above) starts depolarisation? Type the letter in the box

What ion is moving during process '3' on the above diagram?

In a resting neurone, why do potassium ions move out via ion channels?

True or false : Kinesis is a random movement

Which of the following is true?

Which stage of the nitrogen cycle does the above equation represent?

Explain the results in tube 3.