Practise IB Biology HL B Form and Function through questions on biological structures, cells, transport, physiology and body systems, including the wider HL evidence set.
What feature of carbon makes it most suitable as a basis for life?
Its abundance in nature
Its bonding properties
Its reactivity to light
Its presence in the early atmosphere of the Earth
Some of the twenty amino acids that are linked together to make polypeptides in human cells are essential in the diet and others are not. Distinguish between essential and non-essential amino acids.
The molecules of all amino acids include an amine group, a carboxyl group and an R-group. Draw a diagram to show the structure of an amino acid molecule.
The R-groups of amino acids are very diverse chemically. Interaction between R-groups in different parts of a polypeptide helps to determine the tertiary structure of a protein. List two types of interaction between R-groups.
Outline how the amphipathic properties of phospholipids play a role in membrane structure.
State the role of cholesterol in animal cell membranes.
Testis cells are eukaryotic cells. Identify the structures seen under the electron microscope in testis cells that are not present in prokaryotic cells.