Synoptic Biology.


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Synoptic Biology

Synoptic biology is the ability to select and apply general principles
to unfamiliar situations/data.

Modules 5 and 8 will have questions that test your understanding of
modules 1,2,3 and 4. This is called the synoptic assessment.

The synoptic element of modules 5 and 8 is worth more marks that the
actual module content. This means you have to get to grips with the
synoptic element in order to do well. This booklet is designed to help
you to do so.

How much of module 5 and 8 is synoptic?

50% of the marks on the module 5 paper are synoptic and 70 % of the
module 8 paper is synoptic.

In what form are the questions?

Module 5: general questions just like you are used to but they require
information from other modules to answer

Module 8: some general questions…but also data handling & experimental
techniques questions and an essay. Watch out for these!

So there are 3 main types of synoptic questions in the exams:

· synoptic knowledge

· data and investigations

· essay


1. Synoptic knowledge

Which Synoptic subject knowledge topics are going to be assessed?

You have to be able to show the ability to select or apply general
principles to unfamiliar data/situations. These are the main topics
you need to revise:


· Tertiary structure of proteins

· Membrane receptors

· Movement across membranes

· Enzymes

· SA/Vol ratio

· DNA/genetic code

· Translation/transcription

· Basic genetics

· Genetic engineering

· Transport principles

· Use of tracers

· Photosynthesis/respiration

· Stimulus/response

· Negative feedback

· Variation

· Natural selection


Sometime between Easter and Half Term you should prepare your own
individual 1side of A4 summaries for each one of these topics to help
you with your revision.

Deciding exactly what level to learn these topics in is pretty tricky.
Looking at past paper questions will help.

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You won't be asked for the
same level of recall that you needed for each module, but you will be
expected to know all the main principles involved in each topic.

The questions you will get on synoptic knowledge are in module 5 and
section A of module 8

2. Data and Investigations

Data Handling

You have to be able to:

· Use mathematical skills in a range of concepts

· Analyse unfamiliar data

· Use general biological 'nous' to suggest explanations, biological
advantages etc


Mathematical skills that they can ask you to use in questions:

· Use an appropriate number of significant figures;

· Find arithmetic means

· Construct and interpret frequency tables and diagrams, bar charts
and histograms

· Have sufficient understanding of probability to understand how
genetic ratios arise

· Use ratios, fractions and percentages

· Understand the principles of sampling as applied to biological data

· Understand the importance of chance when interpreting data

· Understand the terms mean, median and mode

· Use a scatter diagram to identify a correlation between two
variables

· Use a simple statistical test (you will only get examination
questions on the P2 test)

NB You should be familiar with the use of the Chi-squared test,
understand when it might be validly applied and be able to interpret
results obtained. You will not be expected to recall the formula in
written papers.

Synoptic skills and understanding relating to practical work

Practical work has the following key areas:

o Overview

o Defining the question

o Planning

o Implementation

o Data analysis

You can be asked questions which test your understanding of these
areas. The back of this booklet contains example past paper questions

Overview

One of the aims of the specification is that you should develop an
understanding of scientific method. You should know the following:

Ø Hypothesis - a suggested explanation of an observation that can be
tested by experiment

Ø Theory - a well established hypothesis that is supported by a
substantial body of evidence.

Ø 'Proof' and experiment can either support or disprove a hypothesis,
but it cannot prove that it is certainly true

Ø Variable are things which can be changed e.g. light intensity, pH,
etc


The independent variable is the thing that you change in experiments
(it always goes on the x axis on graphs). In an experiment you change
one independent variable and keep all the others constant. The effect
is shown on the dependant variable e.g. exercise intensity can be an
independent variable heart rate would be a dependent variable. In this
practical external temperature would be one of the other independent
variables you would keep constant. The dependent variable is always
plotted on the y axis on graphs

You should be able to:

· Formulate a hypothesis/suggested explanation

· Examine data/results/observations, then suggest one plausible
biological hypothesis consistent with the information given.

· Analyse whether a suggested explanation is consistent with the data.

Planning Investigations

You should be able to:

· Describe how one independent variable would be varied

· Describe experimental controls- keeping all conditions constant
except independent variable

· describe how dependant variable would be measured

· Explain how reliable data could be obtained/dealing with variability
in living organisms.

Implementation

You should be familiar with the following methods of measurement:


v Methods of measurement

v Biochemical tests

v Chromatography and Rf

v Isotonic solutions

v Indicators

v Controlling temperature

v Colorimetry

v Dilutions

v Safety measures

v Replication

v Centrifugation



Data Analysis

Chi-squared is the only statistical test you need to know so it will
probably be examined in module 5.

This is a very typical chi squared type exam question

Table 1. Data from a survey

Management Scheme

Population of meadow brown butterflies

P2

1976

1983

Area X: Grazed by sheep in summer

435

415

0.47

Area Y: Grazed by sheep in winter

522

595

4.77

Area Z: Not grazed by sheep

287

239

4.38

Table 2 shows part of chi-squared table

Degrees of freedom

Probability

0.50

0.25

0.10

0.05

0.02

0.01

1

0.45

1.32

2.71

3.84

5.41

6.64

2

1.39

2.77

4.61

5.99

7.82

9.21

Question

Are there any significant differences between the population sizes in
areas X,Y and Z between 1976 and 1983? Explain your answer.

Large numbers of student asked this did not understand degrees of
freedom. Because there were three areas X,Y and Z, they opted for
(3-1)=2. The trouble is the table shows 3 individual chi squared tests
each with 1 degree of freedom. So the correct answer was one.

Many student gained one mark for 'There are significant differences in
areas Y and Z,' but did not explain why, nor note that there is a
significant increase in Y and a significant decrease in Z.

General Points

You need to understand the concept of null hypothesis and understand X2
value in relation to table values at probability of 0.05


Standard Deviation

This is another reasonably advanced mathematical concept - it is the
average distance individual results are from the mean. So spread out
data have a high standard deviation and closely grouped data have a
small standard deviation.

The table below shows the typical type of question you could get

Distance from pollution source /km

Zinc concentration /mg dm-3

( mean & standard deviation)

3

[IMAGE]

4

[IMAGE]

10

[IMAGE]

13

[IMAGE]

22

[IMAGE]

Question

What is the range of the concentration of zinc

1 within 1 standard deviation at 4km

2 within 2 standard deviations at 22 km

Answers

1 at 4km; 0.7-2.5 mg dm-3

2 at 22 km; 0.032-0.48 mg dm-3

3. Essay

The Essay

The essay question will be part of the module 8 exam. You will have to
choose one of two titles. It is vital to choose the one, which is
easier to answer bringing in information from lots of the course

Important points about writing the essay:

§ In the answer to this question you should bring together relevant
principles and concepts for as many different areas of biology as
possible.

§ Your essay will be marked not only for its scientific accuracy, but
also for the selection of relevant material.

§ The essay should be written in continuous prose not bullet points.

§ Unless diagrams are clearly annotated they are a waste of time.


Essays the titles from summer 2002

§ The different ways in which organisms use ATP

§ How the structure of cells is related to their function

The ways in which organisms use ATP

the role of ATP could have been described in:

s Muscle contraction

s Active transport

s Maintaining resting potential

s Re-synthesis of acetylcholine and rhodopsin

s Glycolysis of respiration

s Light independent reactions of photosynthesis

s Synthesis (anabolism)

s Kidney function

s Translocation

s Nitrogen fixation

At least 50% of candidates went into great detail about ATP production
and consequently lost 1 relevance mark.

Some candidates stated that what they were about to write was not a
use, but continued nevertheless.

The bombproof approach to writing your essay is to write 8 paragraphs,
each on a relevant scientific concept. If you wrote 4 paragraphs per
page your essay would be approximately two sides long. This is a good
length. Aim to stay under three sides if you go any longer you could
be wasting time that you should be spending on the other exam
questions

How the structure of cells is related to their function

Many candidates were not clear what a cell is, confusing cells with:

ç Organelles such as mitochondria and chloroplasts

ç Tissues

ç Organs

ç Villi

Some students did not relate structure to function eg 'red blood cells
carry oxygen'


Common mistakes included the following

ç Nerve cells - but did not relate length to function

ç Blood cells - did not relate shape to function also must say red
blood cells if you mean that

ç Sperm - has a tail so it can swim is far too simplistic

ç Ova - but no structural detail (should have said large reserve of
nutrients for developing embryo)

ç Epithelial cells -' have villi to increase the surface area for
digestion' - it should have been microvilli

ç 'Leaf cells' - have a large SA for light absorption - should be
palisade mesophyll cells shape for light absorption.

ç Xylem - confusion between tissue and cell

ç Phloem - same structure as xylem'

ç Stomata - confused with guard cells

Students should have known 2 cells well from AS:

Intestinal epithelial

· Microvilli - increase S?A and uptake of products of digestion

· Site of enzymic breakdown of disaccharides

· Many mitochondria to release energy for active transport in the form
of ATP

· Large extensive golgi bodies for mucus/enzyme secretion

Palisade mesophyll

· Cell wall - support/resistance to turgor

· Shape - uptake of light, CO2

· Chloroplasts - arrangement of grana

· Vacuole - turgor, economical deployment of cytoplasm

Marking Essays

Essays are marked on the following sections:

Ø Scientific Content /16

Ø Breadth /3

Ø Relevance /3

Ø QWC /3

Which makes the total marks available 25.

Based on the cells essay for 3 breadth marks candidates should refer
to at least 6 different cell types including at least one plant

Tips for scoring breadth mark:

v Aim to use information from at least 2-3 different modules.

v Make sure you include plant information if appropriate.

Students who write a paragraph about an irrelevant topic (such as
detailed biochemistry of respiration for the ATP question) will lose
one relevance mark.

QWC

The essay should be structured in a reasonable logical way appropriate
and relevant to the title. Ideas and concepts should be explained
sufficiently clearly to be readily understood. Continuous prose should
be used and sentences should generally be complete and constructed
grammatically. However, minor errors of punctuation or style should
not get penalized.

Appropriate A level terminology should be used. You should not use
such phrases as 'fighting disease' 'messages passing along nerves'
enzymes being killed etc but a single lapse would not necessarily
disqualify.


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