Exam Flashcards
Why cant we see structure of organelles with an optical light microscope
Low resolution
Wavelength of light is too long
The action of endopeptidases and exopeptidases can increase the rate of protein digestion.
Describe how.
Exopeptidases hydrolyse peptide bonds at the ends of a
polypeptide/protein AND endopeptidases hydrolyse internal peptide
bonds within a polypeptide/protein;
More ‘ends’ for exopeptidases to work on
What reducing sugar, or sugars, would you expect to be produced during chewing?
Give a reason for your answer
Maltose;
Salivary amylase breaks down starch
Describe the processes involved in the absorption of the products of starch digestion
Glucose moves in with sodium into epithelial cell
Via co transport protein
Sodium is actively transported out of the epithelial cells via Na+/K+ pump
Into the blood
Maintaining a low conc of Na+ in cells
Glucose moves into the blood
Via facilitated diffusion
Describe and explain one feature of the alveolar epithelium that makes the epithelium well
adapted as a surface for gas exchange. Do not refer to surface area or moisture in your
answer
Single layer of cells
Reduces diffusion distance/pathway
