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Biology Dictionary for GCSE Biology and A Level Biology

 

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

D

Diploid: A cell / organism which contains two sets of chromosomes. Shows as 2n, e.g. 2n = 46 in humans. Other species have different diploid numbers - watch the defining diploid video here.

 

Discontinuous variation: Variation which falls neatly into categories; one thing or the other, e.g. ABO blood groups. Tends to be controlled by single alleles, which are present or not.

Disease: Disfunction of the normal state of an organism, i.e. an irregularity from the normal structure / function of any part of an organism, as recognised by a characteristic set of signs and symptoms.

 

Dissociation: The splitting of one molecule into two or more molecules e.g. Oxyhameoglobin into oxygen and haemoglobin. Comes from ‘dis-association’ i.e coming apart.

 

DNA ligase: An enzyme which joins DNA strands, such as those cut by restriction enzymes

 

DNA polymerase: Enzyme which controls DNA replication by causing the addition of complementary bases on the exposed strands. 

 

Dominant: An allele which, if present, is shown in the phenotype

 

Down’s syndrome: A genetic condition cause by three chromosome 21s. It usually arises due to a fault in meiosis so that the eggs have both chromosome 21s instead of one.

As I write the biology dictionary and make the videos to help you learn the definitions by listening in addition to reading them, you'll get the added benefit of hearing and learning the correct pronunciation of biological terminology - but there's more! I'm also making some interactive revision flashcards too! So you can revisit the key words when revising and really embed those a level biology definitions in your head! - The flashcards will be like this (See image below and click to download).

A-Level Biology is a whole lot easier when you know the definitions of commonly used words. This biology dictionary is here to help you learn those A level biology definitions. Remember, a good command of biological terminology (at GCSE but especially at A level) can mean the difference between a poor grade and an excellent one! Since of course you get marks awarded for using the correct biological definitions in the right context when answering exam questions and writing up lab work, coursework and assignments.

The biology dictionary is mainly aimed at a level biology students since at a level, the amount of new technical language expect is quite a lot!

 

Make learning biology definitions a regular part of your studies and keep checking in as more keywords and gcse biology definitions and a level biology definitions are added.

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*Note this A-Level biology Dictionary / Glossary of key terms is not comprehensive and will be updated and added to regularly, so keep checking in and make learning and revising a level biology definitions a consistent part of your biology studies

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