Question

.

Answer 1

You already recorded the pH?

Answer 2

Also, to help you with question 2, you need to add the descriptions of the egg white that you wrote in the Student Guide.

Answer 3

1.You need to record the pH for each test tube (for ansur 1)
2.Use your Student Guide or your Bio book for next question.

Answer 4

Well we cannot record the pH for you either...

What happens when you add pepsin to protein?

Answer 5

Use your pH paper :)

Answer 6

You said you dunno how to read your pH paper, have you read the instruction?
If you can read it, you'll find pH level.

Answer 7

the pH papers are in a box probably?? usually there's a color scale on the backside of the box. Try to match the color of the paper with one of the colors on the scale and read the associated pH.

Answer 8

I cannot see what the levels are... i need to compare the color with the scale...

Answer 9

Pepsin doesn't digest protein very good at high pH.
It needs an acidic environment, so when you add HCl, the pepsin will be activated and digest the protein

Answer 10

Is acidic environment low or high pH?

Answer 11

Do you know how acids and bases work?
\(\large pH = -log[H^+]\)
more acid = more \([H^+]\)

Answer 12

So using this formula, when the H+ concentration increases, the pH goes down

Answer 13

And that means acid = low pH

Answer 14

HCl = very acidic

Answer 15

when you add bicarbonate to water, the pH will go up. So the digestion is bad

Answer 16

1pH of water is 7 so the first one makes sense
2you only add pepsin to the cillinder, the pH should be somewhere around 7 so i guess 6 is all right
3 HCl is very acidic, the pH should be much lower than 6.5, you probably didn't read the pH paper very good.
4 Sodium bicarbonate + water = basic so 10.5 makes sense
5. pepsin + HCl will be acidic, so 7.5 isn't right

least digestion should be tube 4 because the higher the pH, the lower the digestion rate

Answer 17

yes

Answer 18

Yes that is correct

Answer 19

well i already explained that

Answer 20

low ph = activation of pepsin = good digestion
high ph = deactivation of pepsin = bad digestion

Answer 21

is there pepsin in tube 3?

Answer 22

and actually pepsin isn't activated. When pepsin is deactivated it's called pepsinogen. (it's the zymogen of pepsin) So when pH decreases, pepsinogen is activated and becomes pepsin

Answer 23

No, how can digestion occur in tube 3 when there's no pepsin in the tube???

Answer 24

It would be:
Greatest amount of digestion: tube 5
Next greatest amount of digestion: tube 2
Least amount of digestion: tube 4
No digestion: tube 1 and 3

Answer 25

@anthonystone why did you delete all your answers?