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Flashcards in Nitrogen 1 Deck (18):
1

Which enzyme do nitrogen fixing bacteria use?

Nitrogenase - inhibited by oxygen

2

How is oxygen removed to form an anaerobic envrionemnt

Uncoupled mitochondria - burns off oxygen
Leghemoglobin in leguemes which binds to oxygen and reduces its concentration

3

What binds with ammonium to form glutamate?

Alpha ketogluturate

4

What are the four most abundant amino acids in the body?

Aspartate, alanine, glutamine, glutamate

5

What is the process of transferring different amino groups between different molecules?

Transamination

6

What does the amino acid react with during transamination?

A keto acid

7

What keto acid is used to make alanine from glutamate?

Pyruvate

Which is converted into alpha ketoglutarate (typically accepts amino groups)

8

What do all aminotransferases rely on?

Pyridoxal phosphate cofactor

9

What is the temporary storage of nitrogen?

L- glutamine

10

What is PLP made from?

Vitamin B6

11

Where do you find aminotransferases?

In the cell

12

What is the function of aspartate aminotransferase?

Catalyses the aspartate to oxaloacetate

13

What is the function of alanine aminotransferase

Catalyses alanine to pyruvate

14

When do amino acids undergo oxidative catabolism?

Leftover amino acids from normal protein turnover
Excess dietary amino acids
Proteins in the body which are broken down during starvation

15

Where do you find pepsin?

Stomach

16

What breaks down peptides into amino acids in the small intestine?

Peptides -> smaller peptides - Trypsin and chymotrypsin
Smaller peptides -> amino acids - aminopeptidase and carboxypeptidase

17

What enzymes are membrane bound?

Aminopeptidase

18

What is the proteosome used to degrade?

Foreign, unwanted and misfolded proteins