1.7.2 How enzymes work

Enzyme molecules have an ‘active site’ that is a specific shape for a given enzyme. It is here that reactant molecules are converted into products. The active site binds to and holds the reactant molecule in exactly the right position for the reaction to take place. Effectively it fits around the molecule rather like a glove fits around a hand. This very precise three-dimensional structure can only be achieved by enzymes being large complex molecules.

Because the enzyme fits the rea
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The relationship between the EC and the EU

The words ‘European Economic Community’ (EEC), ‘European Community’ (EC) and ‘European Union’ (EU) have already been used in this unit, and many texts and journal and newspaper articles use them interchangeably. It is important that you are clear on their relationship and what they mean. This unit will always refer to the current position as the EU, but what is the relationship between the EC, the EEC and the EU?

As mentioned earlier, the Maastricht Treaty (1992) established
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Historical Interactions between Science and Religion part one
Talk given by Prof. John Hedley Brooke as part of short course 4
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7.1 Introduction

Until now, we have discussed DNA primarily as a double helix, but in its natural state within the cell it is found packaged as a complex mixture with many different proteins and other components. You have already seen examples of proteins with specific roles to play, such as topoisomerases and the proteins with various DNA binding domains, but in this section we will turn our attention to the proteins that serve to pack and organise the DNA into what we call chromatin.

The packaging of
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2.1.1 Try some yourself

Activity 14

Measurement of a ceiling gives a length of 6.28 m and a width of 3.91 m.

  • (a) Make a rough estimate of the area of the ceiling (the length times the width).


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1.4 Broadly typical phases of PhD research

A modern PhD can be viewed as having three key phases (very roughly, but not strictly, corresponding to the three years of a full-time degree), each of which contributes a necessary element of mastery:

  1. Orientation – mastering the literature and formulating a research problem and plan.

  2. Intensive research – gathering the evidence to support the thesis, whether empirical or theoretical.

  3. Entering t
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2.2 Using A. tumefaciens to genetically modify plant cells

Genetic engineers have capitalised on the fact that part of the DNA from the Ti plasmid of A. tumefaciens is integrated into the plant genome during the infection process. Ti plasmids can be isolated and a foreign gene spliced in at an appropriate point, making it possible to transfer the novel gene into the plant.

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1.3.9 Summary

There is a lot of information available on maths and statistics via the internet. Try the activity below to start exploring what is available.

Activity 1

References

Colburn, T., Dumanoski, D. and Myers, J. P. (1996) Our Stolen Future, Little, Brown and Co.

Kishi, M., Hirschorn, N., Djajadisastra, M., Saterlee, L. N., Strowman, S. and Dilts, R. (1995) Relationship of pesticide spraying to signs and symptoms in Indonesian farmers, Scandinavian Journal of Work and Environmental Health, 21 (2), pp. 124– 33.

Wilson, E. O. (1992) The Diversity of Life, The Bellknap Press of the Harvard University Press, Cambridge, USA.


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Ancient Egypt IC132_001

*

The golden mask of the mummy of the Egyptian Pharaoh Tutankhamun, with a an ancient Egyptian temple complex in the background. Illustration by Ivan Lapper, 1990s.
© Historic England Archive


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APPLICATION OF FULL-SCALE MODELLING IN VIETNAM: AN OUTLINE FOR DISCUSSION
This paper discusses the possibility of applying full-scale modelling in Vietnam, a non-western so called developing country. It deals with two main questions: 1) Is the application of full-scale modelling to be restricted to the West only? 2) what are the possibilities, constraints and fields of application - with attention to the methodological validity and technical solution for full-scale modelling in Vietnam? It is argued that since full-scale modelling is based on people-environment intera
Author(s): Anh, Tran Hoai

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"Collateral Damage: Human Rights and U.S. Foreign Policy in the 21st Century"
power poster Lecture by Samantha Power, Anna Lindh Professor of Practice of Global Leadership and Public Policy, John F. Kennedy School of Government, Harvard University. Samantha Power's book, A Problem From Hell: America and the Age of Genocide, was awarded the 2003 Pulitzer Prize for general non-fiction. She was the founding executive director of th
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Japanese Culture Class #2 - Japanese Superstitions
In today’s culture class we learn about Japanese superstitions and related vocabulary. With yesterday being Friday the 13th, we know quite a few of you are feeling pretty superstitious. For that very reason, today we take a look at Japanese superstitions and see what spooks them. This lesson was so interesting and fun, we doubled [...]
Author(s): JapanesePod101.com

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1.1 The Sun at visible wavelengths

The Sun is seen as a blindingly bright, yellow object in the sky. The part of the Sun that you normally see is called the photosphere (meaning 'sphere of light'); this is best thought of as the 'surface' of the Sun, although it is very different from the surface of a planet such as Earth. Its diameter is about 1.4 million kilometres, making the Sun's volume roughly one million times that of the Earth. The photosphere is not solid. Rather, it is a thin layer of hot gaseous material, abo
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1.2 Developing countries

Question

Which countries in the world are classified as ‘developing countries’?

There are various definitions of ‘developing countries’, none entirely satisfactory. The WTO allows members to class
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7.3 Running the models forward

What happens when the models are run forward? It depends upon the models used and the scenarios they are asked to run. It seems almost certain, however, that there will be increases in the global mean surface temperature, to the order of +1.5 to +4.5 °C (– possibly more, according to some models and scenarios.

These changes are predicted to be associated with increases in sea level, changes to weather conditions (e.g. more regular and violent winter storms in the UK) and changes to t
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The Alphabet Song for Sign Language
This song teaches the ABCs for Sign Language. Through music you can learn how to sign. Each letter is shown next to a hand modeling how to sign it. It is very clear, slow-placed, and well presented. (02:29)
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1.4 Stellar masses and stellar evolution

Measured masses range from about 0.08M to about 50M, a large range, with the Sun again showing up as an average sort of star. At the upper end we have some true monsters, but even at the lower end we have bodies that are still far more massive than the planets.

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Singapore icon 'critical'
The 91-year-old man seen as the founder of modern day Singapore is critically ill in hospital. Paul Chapman reports. Subscribe: http://smarturl.it/reuterssubscribe More updates and breaking news: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial, national, and international news. For over 160 years, Reuters has maint
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Try some yourself

Activity 21

Without using your calculator solve the following calculations.

  • (a) 3 + 5 × 2 = ?

  • (b) 12 − 6 + 6 = ?

  • (c) 6 + (5 +
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