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What are the four levels of protein structure? Please name and describe each level.

Primary - where amino acids are in the correct order in the polypeptide chain. Secondary - where small structures within the chain begin to form (including alpha helices and beta pleated sheets). Tertiary - ...
LY
Answered by Leah Y. • Biology tutor
7909 Views

When to use ser and when to use estar?

Ser and etsar are both ways of saying 'to be', but are used in different situations. There is an easy way to remember when to use which verb: SER - DOCTOR Descriptions Occupations Characteristics Time/date O...
EE
Answered by Eloise E. • Spanish tutor
4094 Views

How is breathing rate regulated by the body to meet the increasing demands of exercise?

The command word is ‘how’ and so the question is asking by what means the body meets the increasing demands of exercise.As we all know, breathing rate increases when the body exercises, and so your answer sh...
JH
17323 Views

How do you form a negative sentence in the present tense?

The negative, meaning 'not', is made up of the two words ne and pas which go either side of the verb in the present tense. For example: 'Je ne vois pas le chien' - 'I don't see the dog'. The ne becomes n' ​ ...
SL
Answered by Sara L. • French tutor
4058 Views

How do I form the perfect tense in German?

The perfect tense refers to an action that happened in the past. Eg) I played football. She drank water. We went shopping. In german it is formed using an auxilary verb (haben or sein) and the past participl...
HC
Answered by Hannah C. • German tutor
5522 Views