biological molecules Flashcards
Explain why water molecules can form hydrogen bonds with nitrate ions.
Water is polar
Nitrate ion is negative
Hydrogen bonds between H on water and O on nitrate
What is meant by the term conjugated protein?
Has a prosthetic group
Which is Fe
Attached by covalent bonds
Name the type of reaction for breaking a bond and what happens in the reaction
Hydrolysis
Breaking a bond with the addition of water
A student suggested they should repeat the experiment twice. How does this improve the investigation
Identifies anomalies
Calculate a mean
Improves reliability
How might the lipid content differ between food for microorganisms (mycoprotein) and food for humans
Less lipid content = healthier
More unsaturated fatty acids than saturated because its more safer for the heart
Why is the ability for water to act as a solvent important for the survival of organisms
Transport medium for substances
Reactions can take place in water
Organism can absorb water to take in minerals
Describe the structure of the collagen molecule
Covalent + H-bonds between adjacent polypeptide chains
Peptide bonds between amino acids
Spiral shape
Cross-linked
Fibrous
State 4 differences between hemoglobin and collagen structure
Globular
Prosthetic haem group
Alpha helix
4 polypeptide chains
outline a procedure the student should follow to detect the presence of an enzyme in a solution using the biuret test
- add a few drops of Biuret reagent and mix
- colour change from blue to purple
what does a pale-brown colour mean for the iodine test
little to no starch present
