Top answers

Biology
A Level

What is the electron transport chain and what is its function?

The electron transport chain is a series of four protein complexes, along with accessory electron carriers, embedded in the inner mitochondrial membrane of mitochondria. ...

JJ
Answered by Joshua J. Biology tutor
11003 Views

Describe the reactions that link glycolysis to the krebs cycle

Firstly, try to remember what the intermediate reaction was called (Link Reaction). Name this, as if the name was not stated in the first place in the question, the examiner is most likely looking for you...

SE
Answered by Seth E. Biology tutor
6726 Views

Describe three effects of smoking on the alveoli

Answers could include:Thinning of alveoli walls to reduce the size of the alveoli air sacsSacs lose their elasticity leading to a difficulty in expelling carbon dioxide and taking in oxygenDecrease in dif...

TB
Answered by Tash B. Biology tutor
3201 Views

Define the term 'water potential' and describe the difference between isotonic, hypotonic and hypertonic solutions. Suggest the different effects on cells placed in the different solutions.

Water potential basically means how likely it is for water molecules to diffuse out of or into a solution.Pure water (i.e. water with no solutes) has a water potential value of 0.As you add solutes (i.e. ...

ET
Answered by Elliot T. Biology tutor
48488 Views

Describe the role of a ribosome in the production of a polypeptide

mRNA from the nucleus binds to a ribosome which is either free in the cytoplasm or associated with the rough ER. The ribosome binds at the 5' end and scans to the start codon (AUG). The ribosome allows tR...

JM
Answered by Josh M. Biology tutor
9955 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:

© 2026 by IXL Learning