Theory

CH17 - SELECTION AND EVOLUTION

(a) Explain how changes in the nucleotide sequence of DNA may affect the amino acid sequence in a protein.[7](b) Explain how natural selection may bri...

2009 Summer

Theory

CH17 - SELECTION AND EVOLUTION

(a) *Asellus aquaticus* is a small freshwater crustacean. 200 *A. aquaticus* were released into a pond where there had previously been none. The pond...

2009 Winter

Theory

CH17 - SELECTION AND EVOLUTION

(a) Complete Fig. 4.1 by writing letters to represent the sets of chromosomes in bread wheat.(b) Explain why hybridisation between emmer wheat and goa...

2009 Winter

Theory

CH17 - SELECTION AND EVOLUTION

(a) A recent study of the house mouse, Mus musculus, on the island of Madeira resulted in the following observations. • There are six distinct popul...

2009 Winter

Theory

CH17 - SELECTION AND EVOLUTION

(a) Explain how two parents, both of whom produce normal amounts of AG, can produce a child with Pompe disease...........................................

2009 Winter

Theory

CH17 - SELECTION AND EVOLUTION

Anole lizards are found throughout the Caribbean and the surrounding mainland. There are many species. Each species is found only on one island or a s...

2010 Summer

Theory

CH17 - SELECTION AND EVOLUTION

The American crocodile, Crocodylus acutus, was classified as an endangered species by the USA in 1975. It is found in estuarine regions of southern Fl...

2010 Summer

Theory

CH17 - SELECTION AND EVOLUTION

The fruitfly, _Drosophila_, has many different species. Three of these species, _Drosophila pseudoobscura_, _D. persimilis_ and _D. miranda_, are thou...

2010 Summer

Theory

CH17 - SELECTION AND EVOLUTION

The American crocodile, Crocodylus acutus, was classified as an endangered species by the USA in 1975. It is found in estuarine regions of southern Fl...

2010 Summer

Theory

CH17 - SELECTION AND EVOLUTION

The fruitfly, \textit{Drosophila}, has many different species. Three of these species, \textit{Drosophila pseudoobscura}, \textit{D. persimilis} and \...

2010 Summer

MCQ

CH1 - CELL STRUCTURE

Which statements about resolution and magnification are correct?[Table_1]

2018 Summer

MCQ

CH1 - CELL STRUCTURE

An eyepiece graticule has a scale with 100 divisions. A stage micrometer has a scale with 50 divisions, each of which is 0.040 mm apart. Using a ×40 ...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

A prokaryotic cell which is 1 µm in diameter, is magnified 50000 times in an electron micrograph. What is the diameter of the cell in the electron m...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

A scientist carried out an experiment to separate cell structures in animal cells. The cells were broken open to release the cell structures. This ext...

2018 Summer

MCQ

CH1 - CELL STRUCTURE

Radioactively-labelled nucleotides are introduced into a cell.In which cell structures will the radioactivity first become concentrated?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

What is the general formula for amylose?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagram shows relationships between some important molecules and bonds. What is represented by circles numbered 1, 2 and 3?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

In unsaturated lipid molecules, where are double bonds located?

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

Phospholipids and triglycerides are important biological molecules.Which properties are correct for these molecules?[Table_1]

2018 Summer

MCQ

CH2 - BIOLOGICAL MOLECULES

The diagrams show two arrangements of amino acids in a protein. Which row correctly names the bonds at S or T?

2018 Summer