List oxygen glucose carbon dioxide Marks (a) Substance selected ______________________________ (i) Explain why its diffusion is important.Tags: Business Plan Template AustraliaCritical Essays On Dramatic PoetryAfrican Essay Philosophical ThoughtEssays Diversity In The WorkplacePci Irq AssignmentMaster'S Thesis Poster PresentationPlanning BusinessFarm Business Plan SampleScientific American Essays
Marks 2 (d) 1 Question 8 (c) (d) Acceptable Answer Not acceptable Stage 2 Nuclear membrane disappears / breaks down or Spindle forms or Chromosomes / (pairs of) chromatids / they move to equator / middle of cell Chromosomes shorten and thicken Chromatids join together at centromere Stage 4 Chromatids / they separate or Chromatids / they are pulled apart or Spindle fibres shorten So there is no loss of information / So they have the same information (as parent cell) / So they have a full set of information / genes / all genes passed on Chromosomes / chromatids split Chromosomes separate So they have all the characteristics of the species – negates So they function properly So they have correct information Same genetics To stop mutation (negates) Mark 1 1 1 St Gr.
2012 Q9 The diagrams below show two stages of mitosis in cells.
______________________________________________________________ (b) ______________________________________________________________ (b) Cells from the same plant tissue were placed in three different liquids, left for 20 minutes and then examined using a microscope.
The following diagrams represent cells from each liquid.
Marks (b) (i) What term is used to describe the temperature at which an enzyme works best?
(ii) Name one factor, other than temperature, which has an effect on the activity of an enzyme.(iii) What would happen to the mass of the model cell during the two hour period? Mass of model cell Explanation Question 4 (a) i ii Acceptable Answer iii Increase water moves in Diffusion too large to fit/pass through the pores/pass through water moves from high water concentration to low / down (water) concentration gradient/ water moves by osmosis/diffusion Not acceptable Negates Mark Osmosis 1 Insoluble Selectively permeable Through cell wall 1 1 HWC 1 Producing new cells St Gr.2011 Q8 (c) & (d) (c) The following is a description of the stages of mitosis.National 5 Biology Relevant Past Paper Questions from SQA Standard Grade Credit and Intermediate 2 papers Unit 1: Cell Biology March 2014 Transforming lives through learning N5 Biology Past Paper Questions This resource has been produced in response to the requests from practitioners who attended the National Qualifications Sciences events at Hampden Stadium in December 2013 which Education Scotland organised in partnership with the SQA.The questions in this resource relate to the Cell Biology Unit for National 5 Biology and have been taken from the 2011, 20 Standard Grade and Intermediate 2 Past Papers.Marks B Q1 (b) i &ii 1 (i) The plant cell is placed in a hypertonic solution.Describe the appearance of the plant cell after one hour.Cell Structure Int 2 2011 B The diagram below represents a potato cell.Q1(a )& (c) (i) Name the parts of the cell labelled X and Y.If practitioners require the full integrated question, they should refer to the original past paper on the SQA website.Past paper questions for the other two National 5 Units, Multicellular Organisms and Life on Earth, are also available from Education Scotland’s National Qualifications Glow portal: and paste link into your browser).