IB Biology – Cells Pre-Qualifying Test 2023.

IB Biology – Cells Pre-Qualifying Test 2023.Cell Theory - ANSWER Idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells Unicellular organism - ANSWER Organism that consists of one cell that carries all functions of life Metabolism - ANSWER Chemical reactions inside a cell, such as cell respiration Homeostasis - ANSWER The ability to keep conditions inside the organism within tolerable limits Plasma membrane - ANSWER Found in all type of cells, it acts as support, protection and controls the movement of materials in/out of the cell Scale bar - ANSWER measure the size of the scale bar and divide by the magnification Multicellular organisms - ANSWER Organisms that consist of multiple cells that each have specific functions Cell differentiation - ANSWER Development of cells in different ways to perform different functions Stem cells - ANSWER Cells which have the capacity to self-renew through cell division and differentiation Emergent properties - ANSWER Properties that arise from the interaction of component parts. "The whole is greater than the sum of its parts." Eukaryotic cell - ANSWER Cells for a eukaryotic organism that have complicated, internal structures that are enclosed within membranes Prokaryotic cell - ANSWER Cells that do not have nucleus or any membrane-bound organelles Cell wall - ANSWER Found in plants, fungi and bacteria, they have an outer layer, are rigid and strong and made of cellulose. They are there for support, protection and allow chemicals to diffuse in and out of the cell Cytoplasm - ANSWER Material that contains enzymes that catalyse the chemical reactions of metabolism, it supports and protects cell organelles