1.1 biological molecules

Question 1

what are covalent bonds

Answer 1

• atoms share a pair of electrons in their outer shells
• both outer shells are filled

Question 2

what are ionic bonds

Answer 2

• ions with opposite charges attract one another
• weaker than covalent bonds

Question 3

what are hydrogen bonding

Answer 3

• negative region and positive regions of polar molecule form weak electrostatic bonds

Question 4

what are polymers

Answer 4

• links of monomers
• formed by polymerisations
  polysaccharides, polypeptides and polynucleotides

Question 5

what are condensation reactions

Answer 5

• when a subunit is attached a molecule of water is formed
• amino acids, glucose

Question 6

what is hydrolysis

Answer 6

• addition of water used to split a molecule into constituent parts
• polypeptides into amino acids, starch into glucose

Question 7

what is metabolism

Answer 7

all the chemical process taking place in a living organism