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Medicine Term One > Nitrogen > Flashcards

Flashcards in Nitrogen Deck (89)
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1

How do nitrogen fixing bacteria live

anerobically

2

what inactivates nitrogen fixing bacteria

oxygen

3

what do root nodules on legumes contain

Rhizobium bacteria

4

example of nitrogen fixing bacteria

cyanobacteria

5

Why are leguminous plants important for nitrogenous activity

legheamoglobin combines to oxygen making conditions aerobic therefore nitrogenase can work

6

Nitrogen fixing requires

nitrogenase enzyme and a lot of ATP

7

cyanobacteria forms what to prevent oxygen entry

heterocysts

8

example of symbiotic relationship

Leguminous plants and nitrogenase

9

what usable form of nitrogen is taken up by plants

Nitrate

10

Flow of N from NH4+ to other biomolecules occurs through

glutamate

11

Glutamate formed by

ketoglutarate and ammonia

12

what 4 amino acids are held in much higher concentrations

Alanine, glutamine, glutamate and aspartate

13

organisms can fix N2 therefore conserve nitrogen by

Transaminations

14

Whats is transamination

transfer of amino groups between different molecules

15

Taking an amino acid of creates a

ketoacid

16

In transamination one of the two substrates always has to be

glutamate

17

the synthesis and degradation of amnio acids is

reversible

18

what typically accepts amino groups

α-ketoglutarate

19

The enzyme catalysing transamination is

aminotransferases

20

aminotransferases depends on cofactor

pyridoxal phosphate

21

what acts as temporary storage for nitrogen

L glutamine

22

pyridoxal phosphate derive from

vitamin b6

23

If aminotransferase present in plasma indicates

cell damage i.e. liver disease

24

structure of amino acid

NH3 group attached to a carbon which is attached to a COOH

25

structure of a ketoacid

a C double bond O attached to the COOH group

26

amino acid biosynthesis

addition of amino groups to the carbon skeletons of a-keto acids

27

example of a ketoacid

pyruvate

28

Amino acids undergo oxidative catabolism under three circumstances

Left over proteins, degraded
Dietary proteins exceed protein synthesis
Starvation, proteins broken down

29

Whats happens to dietary proteins

enzymatically hydrolysed

30

What enzymes breaks down proteins in the stomach

pepsin

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