- Which phenotype is being investigated in a study into the factors affecting the risk of developing lung cancer?
- Why is it better to store seeds from several individual plants of one species rather than seeds from one individual plant?
- Where are mitochondria located in an egg cell? What does this look like?
- In an investigation where a student studied the mass needed to break dry plant fibres, which 3 factors would need to be kept constant?
- How would the results obtained from an investigation where a student studied the mass needed to break dry plant fibres be processed to produce a mean?
- What might the safety role of a container with a soft fabric be in an investigation where a student studied the mass needed to break dry plant fibres?
- In an investigation into the mass required to break four samples of an oil-based plastic fibre, the mass required to break the 1st sample was 13,330 g, for the 2nd it was 2,300 g, for the 3rd it was 13,600 g & for the 4th it was 13,600 g. Why was the mean for the plastic fibre calculated using only of the 3 results?
- What contains a haploid number of chromosomes in a sperm cell? What does this look like?
- If the mean germination success of 'Encholirium' species A is 48 out of 50 for those planted immediately & 45 after drying, 40 out of 50 for those planted immediately & 23 after drying for species B, 45 out of 50 for those planted immediately & 45 after drying for species C, & 48 out of 50 for those planted immediately & 37 after drying for species D, which is least likely to survive storage in a seedbank?
- What contains acrosin? What does this look like?
- Can pluripotent stem cells give rise to totipotent stem or differentiated cells?
- Can totipotent stem cells give rise to totipotent stem or differentiated cells?
- What accepts the ADH when osmoreceptors detect an increasing plasma concentration of inorganic ions?
- What is not the only hormone that affects the kidney tubules & controls the amount of urine formed in response to changes in the body?
- To what are membranes not permeable unless there are protein channels or carrier proteins present?
- What results in a reduction in blood volume, causing blood pressure to fall?
- What also drop when ADH levels fall? What are taken out of the tubule membranes & repackaged in vesicles, making the tubule impermeable to water again?
- What detect an increasing plasma concentration of inorganic ions? Where do they send nerve impulses to, which consequently releases stored ADH into the blood?
- Does the concentration of inorganic ions in the blood rise or fall if water is in short supply or you sweat a lot or eat a very salty meal? Does this mean that its water potential become more negative or positive?
- What are less permeable to water if less ADH is released? How much water is, therefore, reabsorbed, causing large amounts of dilute urine to be produced?