Top answers

Can you name and describe the four levels of protein structure?

Primary structure - This is the sequence of the amino acids on the polypeptide chain. The amino acids are held together with covalent bonds. When mutations occur, they effect the primary structure of protein...
FL
Answered by Francine L. • Biology tutor
5325 Views

What is the difference between Mitosis and Meiosis?

Both meiosis and mitosis are types of nuclear division . The main difference between the two is the ​number ​of nuclear divisions that take place: Mitosis ​: involves one nuclear division which produces two ...
SB
Answered by Sarah B. • Biology tutor
6051 Views

What is the function of mitochondria?

Mitochondria are the 'powerhouses' of the eukaryotic cell. These organelles are the sites of cellular respiration, the metabolic process that generates energy from carbohydrates in the cell. The energy produ...
SB
Answered by Sarah B. • Biology tutor
7963 Views

Why can't you say "ayer he visto a Marcos"?

You can only use the perfect tense, "haber + perfect participle" when something is either very recent or is still ongoing. "Ayer", yesterday, is definitely not still going on, and it's no...
CS
Answered by Claire S. • Spanish tutor
3853 Views

How do I determine when to use the subjunctive?

When dealing with the subjunctive, there are two acronyms which, if committed to memory, will help you massively with learning in which situations the subjunctive needs to or needn't be used. When it is NOT ...
JH
Answered by Jakob H. • Spanish tutor
6606 Views