Top answers

Biology
A Level

What are the main differences between prokaryotic and eukaryotic cells?

I would say the main difference here is that eukaryotic cells (e.g. animal cells) have a nucleus and membrane-bound organelles, whereas prokaryotic cells (bacteria and archaea) have no nucleus and no memb...

SP
Answered by Sophie P. Biology tutor
15029 Views

Explain why the activity of amylase rapidly decreases above pH 7.

pH 7 is the optimum pH for amylase. This means it performs best and has maximum activity at this pH. Above pH 7, the activity of amylase rapidly decreases beacuse the concentration of H+ ions (or protons)...

ER
Answered by Emilia R. Biology tutor
54733 Views

What might happen to the rate of glucose production as the temperature of a solution of sucrose and (human) sucrase was raised from 33°C to 43°C and why?

Sucrase is an enzyme that breaks sucrose down to its constituent monosaccharides – glucose and fructose. At 33°C the enzyme will not be working at its’ optimum, as it has evolved to work most efficiently ...

MM
Answered by Miranda M. Biology tutor
7363 Views

How would you test for the presence of a non-reducing sugar?

We can check for the presence of non-reducing sugars the Benedick's Test. If a reducing sugar is present in a solution, adding Benedick's reagent and heating will form an insoluble red precipitate. Non-re...

JO
Answered by Jess O. Biology tutor
112894 Views

Could you explain the difference between passive diffusion and facilitated transport?

Passive diffusion occurs without any transmembrane proteins being involved, the molecules cross the lipid bilayer following a concentration gradient (from the highest concentration to the lowest). Small u...

EW
Answered by Eleonore W. Biology tutor
3088 Views

We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning