Theory

CH12 - ENERGY AND RESPIRATION

(a) Table 4.1 shows a sequence of 12 nucleotides in the template strand of a short length of a DNA molecule, the corresponding primary transcript and ...

2024 Spring

3

Theory

CH12 - ENERGY AND RESPIRATION

(a) Aerobic respiration occurs in four successive stages: glycolysis (G), link reaction (LR), Krebs cycle (KC) and oxidative phosphorylation (OP).Comp...

2024 Winter

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Fig. 6.1 is a diagram of part of a mitochondrion.On Fig. 6.1, use arrows to show the route taken by oxygen from the cytoplasm into the mitochondri...

2024 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

A respirometer is a piece of apparatus that can be used to measure the rate of respiration of living tissue such as germinating peas.A simple respirom...

2024 Spring

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Aerobic respiration occurs in four successive stages: glycolysis (G), link reaction (LR), Krebs cycle (KC) and oxidative phosphorylation (OP).Comp...

2024 Winter

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) Some organisms carry out respiration in anaerobic conditions when oxygen is not available or when there is a low concentration of oxygen. In yeast...

2023 Winter

3

Theory

CH12 - ENERGY AND RESPIRATION

(a) The respiratory quotient (RQ) values for different respiratory substrates can be calculated.Table 5.1 shows:• the formulae of four respiratory s...

2023 Winter

4

Theory

CH12 - ENERGY AND RESPIRATION

Many factors affect the rate of cellular respiration.(a) Pyruvate carboxylase (PC) deficiency is a rare disease. The rate of respiration in the cells ...

2023 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) In plants such as rice, Oryza sativa, rubisco has a low rate of activity, which in turn affects the rate of photosynthesis. The cereal crop sorghu...

2023 Summer

2

Theory

CH12 - ENERGY AND RESPIRATION

(a) The Krebs cycle was named after the biochemist Sir Hans Krebs, who worked out the sequence in 1937.Fig. 1.1 is an outline of the Krebs cycle.Ident...

2023 Summer

2

MCQ

CH1 - CELL STRUCTURE

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

2018 Summer

3

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

3

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

3

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

2

MCQ

CH1 - CELL STRUCTURE

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

2018 Summer

2

MCQ

CH2 - BIOLOGICAL MOLECULES

What is the general formula for amylose?

2018 Summer

3

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

2

MCQ

CH2 - BIOLOGICAL MOLECULES

In unsaturated lipid molecules, where are double bonds located?

2018 Summer

3

MCQ

CH2 - BIOLOGICAL MOLECULES

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

2018 Summer

3

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

3