Listing all results (1884)

Induction of the Lac Operon in E.coli

Produced by Science & Plants for Schools (SAPS), this activity enables students to look at the induction of the lac operon in the bacterium Escherichia coli (E. coli).Lactose is found in milk but not in many other environments. The enzyme, beta-galactosidase breaks down lactose to glucose and galactose. E.coli...
Publication date:
2000 - 2009

1 file

0

0
Not yet rated

Calculating the Mitotic Index of a Growing Root Tip

Produced by Science & Plants for Schools (SAPS), this investigation enables students to investigate the process of mitosis in a growing root tip. The mitotic index is the fraction of cells in a microscope field which contain condensed chromosomes.In this activity students prepare and stain root tips. Garlic cloves...
Publication date:
2000 - 2009

1 file

1

0
Not yet rated

The Age of the Universe

This activity, from the Royal Observatory Greenwich, looks at Hubble’s law, whereby students use real data from the Sloan Digital Sky Survey to plot a graph from which they can obtain the Hubble constant. Students then look at the possible sources of error in their data and use this to calculate the uncertainty in...
Publication date:
2010 to date

3 files

0

0
Not yet rated

Unit P3: Equilibrium II: Acids and Bases

Equilibrium II: Acids and Bases was one of the physical chemistry units in the Independent Learning Project for Advanced Chemistry (ILPAC) scheme that was sponsored by the Inner London Education Authority and first published by John Murray in 1983. This was a study guide, not a textbook.In level one, this unit takes a...
Publication date:
1980 - 1989

1 file

2

5
Average: 5 (1 vote)

Gum Fun: Investigating Plant Gums

Plant gums are often used in the food industry as thickening and stabilising agents. Gums are water soluble polysaccharides, such as starch and cellulose. In this activity, students investigate what happens to the texture when different polysaccharides are mixed.When solutions of some polysaccharides are mixed, they...
Publication date:
2000 - 2009

1 file

0

0
Not yet rated

What Is Wood?

This student sheet invites students to consider lignification in detail. Students take thin sections from successive internodes of the shoot and calculate the lignification index of each section. These can then be compared with sections from other parts of the plants to consider where lignin is deposited in other...
Publication date:
2000 - 2009

1 file

0

0
Not yet rated

Investigating Vernalisation and Creating Genetic Crosses

Vernalisation offers an interesting example of the way that plants have evolved to exploit the predictability of seasonal change and, in this case, to ensure that flowering occurs at an appropriate time. It also gives an example of how environmental factors control and interact with different stages in the life cycle....
Publication date:
2000 - 2009

2 files

0

0
Not yet rated

Koch's Postulates

This protocol allows students to demonstrate and test Koch’s Postulates using apples infected with the fungus Penicillium expansum. The required experimental work extends over 3 to 4 weeks, but the essential steps can be demonstrated in a single practical session if students are provided with cultures and infected...
Publication date:
2000 - 2009

4 files

1

0
Not yet rated

Hydroponics

This practical activity outlines how to grow plants hydroponically in the classroom. It aims to give students an understanding of the basic growth needs of plants. It also shows how hydroponics can be utilised to provide food to humans as our population expands.This technique can be expanded in a number of ways, for...
Publication date:
2010 to date

2 files

0

0
Not yet rated

Staining a Root Tip and Calculating Its Mitotic Index

In this practical activity students stain root tips and examine them for signs of cells dividing by mitosis. Students can either compare two different sources of root tip or two different stains. The mitotic index is the fraction of cells in a microscope field which contain condensed chromosomes. This index can be...
Publication date:
2000 - 2009

2 files

0

0
Not yet rated

Pages