Biology Key Word Definitions (M)

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What is malnourished?
The condition when the body does not get a balanced diet.
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What is mass?
The quantity of matter in an object; a measure of the difficulty of changing the motion of an object (in kilograms, kg).
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What is mean?
The arithmetical average of a series of numbers.
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What is median?
The middle value in a list of data.
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What is meiosis?
The two stage process of cell division which reduces the chromosome number of the daughter cells. It is involved in making the gametes for sexual reproduction.
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What is the menstrual cycle?
The reproductive cycle in women controlled by hormones.
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What is mesophyll tissue?
The tissue in a green plant where photosynthesis takes place.
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What is metabolic rate?
The rate at which the reactions of your body take place, particularly cellular respiration.
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What is methane?
A hydrocarbon gas with the chemical formula CH_4. It makes up the main flammable component of biogas.
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What is a microorganism?
Bacteria, viruses and other organisms that can only be seen using a microscope.
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What is mineral ion?
Chemical needed in small amounts as part of a balanced diet to keep the body healthy.
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What is mitochondria?
The site of aerobic cellular respiration in a cell.
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What is mitosis?
Asexual cell division where two identical cells are formed.
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What is mode?
The number which occurs most often in a set of data.
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What is a motor neuron?
A neutron that carries impulses from the central nervous system (CNS) to the effector organs.
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What is MRSA?
Methicillin-resistant Staphylococcus aureus. An antibiotic-resistant bacterium.
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What is a multicellular organism?
An organism which is made of many different cells which work together. Some of the cells are specialised for different functions in the organism.
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What is muscle tissue?
The tissue which makes up the muscles. It can contract and relax.
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What is a mutation?
A change in the genetic material of an organism.
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What is mycoprotein?
A food based on the fungus Fusarium that grows and reproduces rapidly. It means 'protein from fungus'.
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Card 2


What is mass?


The quantity of matter in an object; a measure of the difficulty of changing the motion of an object (in kilograms, kg).

Card 3


What is mean?


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Card 4


What is median?


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Card 5


What is meiosis?


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