Skip to main content

Join your FREE online community of students & teachers

LC Biology
LC Biology

From looking at the past papers about 90% of the marks for Biology can be gained from knowledge of all the definitions and theory. Most questions are not direct definitions but theory questions like "describe the..." and "draw the...". Direct definitions are about 20% of the paper. As the paper is mostly theory based, calculations are quite rare unlike chemistry and physics.

For chemistry on the other hand the marks are more mixed up. I would say about 55 - 60% can be gained from definitions and theory while the rest come from calculations. The first few lab experiment and... (More)

Share Notes
LC Biology

DNA & RNA Summary

Heredity: Is the passing on of features from parents to offspring by means of genes.

Gene: Is a section of DNA that causes the production of a protein.

Gene expression: Is the way in which the genetic information in a gene is decoded in the cell and used to make protein.

Characteristics: Are traits or features that are inherited genetically.

Structure of DNA

DNA stands for deoxyribonucleic acid. DNA is a double stranded molecule made up of elongated chains of sub-units called nucleotides. DNA contains four chemicals called base pairs which are:

-Adenine (A)

-Thymine (T)

-Guanine (G)

-Cytosine (C)... (More)

Share Notes
LC Biology

Photosynethises Exam answers 2007 -2018

2007

STATE A PRECISE ROLE FOR :

CARBON DIOXIDE: In the dark stage CO2 is converted to glucose using ATP and NADPH

WATER: is split into H+ and OH-

ANSWER THE FOLLOWING QUESTIONS IN RELATIONS TO AN ACTIVITY YOU HAVE CARRIED OUT TO INVESTIGATE THE INFLUENCE OF LIGHT INTENSITY OR CO2 CONCENTRATION ON THE RATE OF PHOTOSYNTHESIS.

NAME THE PLANT YOU USED: Elodea

HOW DID YOU VARY LIGHT INTENSITY: using a lamp and by varying the distance of the lamp from the elodea.

STATE A FACTOR THAT YOU KEPT CONSTANT: Temperature

HOW DID YOU ENSURE THE FACTOR YOU MENTIONED... (More)

Share Notes
LC Biology

Enzymes - Sample answers 2007 - 2018

2007

WHAT IS MEANT BY IMMOBILISATION?

Means fixed in place. Immobilised enzymes are enzymes that are attached,or fixed to each other or to an inert material.

NAME A SUBSTANCE THAT IS USED TO IMMOBILISE ENZYMES?

Sodium Alginate

2 ADVANTAGES OF IMMOBILISING ENZYMES?

  • Can be reused. This is a huge advantage as the cost of replacing enzymes are very high.
  • The process of immobilising an enzyme increases its stability

ONE APPLICATION OF A NAMED IMMOBILISED ENZYME - REFER TO SUBSTRATE, PRODUCT & ENZYME.

Lactase is an immobilised enzyme in porous beads and used to convert lactose into sweeter tasting... (More)