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level: Level 1 - Definitions

Questions and Answers List

level questions: Level 1 - Definitions

Question	Answer
A group of tissues that work together to carry out a particular function, such as the stomach or the heart.	Organ
A group of organs that work together to carry out a particular function.	Organ System
The partially permeable structure surrounding cell which controls what enters and leaves the cell.	Cell Membrane
The non-living layer outside the cell membrane of certain types of cell, giving support and shape.	Cell Wall
The cell wall in plants is made of this.	Cellulose
Organelles found only in plant (and some protoctists) cells, where photosynthesis takes place in the cell.	Chloroplasts
This organelle contains chlorophyll, making the cell look green.	Chloroplast
The jelly-like fluid inside the cell which contains the organelles and is where many chemical reactions take place.	Cytoplasm
Long DNA molecules, which become visible during cell division, found in the nucleus of the cell.	Chromosomes
The organelle in plant and animal cells which contains the genetic material (DNA).	Nucleus
Organelles that carry out aerobic respiration, releasing energy in the form of ATP for the cell.	Mitochondrion (one), Mitochondria (plural)
Organelle where protein synthesis occurs.	Ribosomes
Organelle found in the middle of many plant cells and contains cell sap.	Vacuole
A cell that can divide over and over and remains undifferentiated (unspecialised). Present in the early embryo and in some adult tissues such as bone marrow.	Stem Cell
The process whereby an unspecialised stem cell becomes a specialised cell which carry out particular functions.	Differentation
Cells which have membrane-bound organelles e.g. Nucleus	Eukaryotic Cell
Cells which are very small and do not have membrane-bound organelles e.g. Nucleus	Prokaryotic Cell
Organism type when it is made up of only one cell	Unicellular
Organism type when it is made of many cells	Multicellular
Name the organelle that contains DNA	Nucleus
A proposal intended to explain certain facts or observations. It must be testable.	Hypothesis
A statement suggesting what will happen in the future, based on observation, experience or hypothesis.	Prediction
The variable that you change or select.	Independent Variable
The one that changes and you measure.	Dependent Variable
These are kept the same so that the experiment is fair and valid.	Control Variable
This is improved by repeating the experiment and calculating the mean.	Reliability
Where the original experimenter repeats the investigation using the same method and equipment and gets the same results.	Repeatability
Where the investigation is repeated by another person, or by using a different method or equipment and similar results are obtained.	Reproducability
The closeness of the experimental value being close to the true value.	Accuracy
Measurements which have very little spread about the mean value and is helped by using equipment with greater resolution.	Precise
The smallest change in the quantity being measured (input) of a measuring instrument that gives perceptible change in the reading. Eg using mm rather than cm.	Resolution
The suitability of the investigative procedure to answer the question being asked.	Validity
Part of an experiment which is set up to show that other variables are not having an affect on the outcome of an experiment.	Control Group
A structure within a cell that carries out a particular function. eg. nucleus	Organelle
A group of similar cells that work together. Eg. muscle	Tissue