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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
5557 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
4031 Views

When should I use the perfect and imperfect tenses when talking about past actions?

For this question we will use the verb manger (to eat) as an example. The perfect tense is used to describe an action which took place once in the past. You can think of it as a single, completed action . EX...
LG
Answered by Laura G. • French tutor
4311 Views

What does a velocity-time graph represent?

The first step in answering any question is to figure out what the question really means! Velocity is a term physicists use to describe not just speed, but speed in a particular direction. When we talk about...
IS
Answered by Iman S. • Physics tutor
22007 Views

X=4a+3b, If a is a two digit cube number and b is a two digit square number then what is the lowest possible value for X?

In order to find the lowest value for X we first need to find the lowest possible value for a and b. Let us start off with a: If a is the lowest possible cube number we can start by checking the first couple...
SI
Answered by Silje I. • Maths tutor
4987 Views