IGCSE Biology keywords

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93 Cards. Created by jeanne ().
Keywords and definitions for IGCSE Biology
 
Term  
Definition

Abdomen

The lower regions of the body. In humans it contains the digestive system, kidneys etc.

Accurate

A measurement is considered to be accurate if it is judged to be close to the true value

Acid rain

Rain that is acidic due to dissolved gases such as sulphur dioxide, produced by the burning of fossil fuels.

Active site

The site on an enzyme where the reactants bind

Active transport

The movement of substances against a concentration gradient and/or across a cell membrane, using energy.

Adaptation

Special feature that makes an organism particularly well-suited to the environment where it lives.

ADH

Anti-diuretic hormone secreted by the pituitary gland in the brain that affects the amount of water lost through the kidneys in urine

adult cell cloning

Process in which the nucleus of an adult cell of one animal is fused with an empty egg from another animal. The embryo which results i spaced inside the uterus of a third animal to develop.

Adult stem cells

Stem cells (cell with the potential to differentiate and form a variety of other cell types) that are found in small quantities in adult tissues.

Aerobic respiration

Breaking down food using oxygen to release energy for the cells

Agar

The nutrient jelly on which many microorganisms are cultured

Agglutinate

Stick together

Agriculture

Growing plants or other organisms on farms to supply human needs e.g. for food, clothing etc.

Algae

Single-celled or simple multicellular organisms that can photosynthesise but are not plants.

Algal cells

The cells of algae, single-celled or simple multicellular organisms, which can photosynthesise but are not plants.

Allele

A version of a particular gene

Alveoli

The tiny air sacs in the lungs which increase the surface area for gaseous exchange.

Amino acids

The building blocks of protein

Amylase

The enzyme made in the salivary glands and the pancreas which speeds up the breakdown of starch into simple sugars.

Anaerobic respiration

Breaking down food without oxygen to release energy for the cells.