Why do humans have difficulty breathing at high altitudes?
a oxygen makes up a lower percentage of air
b temperature is lower
c barometric pressure is higher
d partial pressure of 02 is lower
e air is dryer
Which of the following enzymes works best at a low pH
a amylase
b trypsin
c pepsin
d lipase
e nuclease
thankyou :)
2007-05-09 22:48:36 · 11 answers · asked by malibuisace 2 in Science & Mathematics ➔ Biology
d. Partial pressure is lower, so exchange at alveoli is compromised. This is why people at high altitudes have more red blood cells, to compensate for the lower exchange rate. O2 percentage in air does not vary with altitude, but the air, all of it, becomes thinner.
c. pepsinogen is released by the chief cells in the stomach. It is then activated by hydrochloric acid into pepsin enzyme at a pH of about 2.0
2007-05-09 23:45:23 · answer #1 · answered by Labsci 7 · 1⤊ 0⤋
enzymes are proteins that catalyze biochemical reactions. In these reactions,the compounds on which the enzyme acts are called substrates and the resulting compunds are called products. Both the temperature and pH can affect the rate of reaction catalyzed by an enzyme, means catalyse works best at neutral pH. If the solution is too acidic (low pH value) or too basic (high pH value) the catalase is inactive - no longer functions as an enzyme
2007-05-10 01:22:19 · answer #2 · answered by Anonymous · 0⤊ 1⤋
1.a 2.?
2016-04-01 04:56:25 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The answer to number 1 is (a). Breathlessness is one of the early stages of altitude sickness!
The answer to number 2 is (c). Pepsin is made in the Stomach where HCl creates very acidic conditions.
2007-05-13 06:21:10 · answer #4 · answered by Ian M 2 · 0⤊ 0⤋
1 d - the reason its not a is that the percentage of gasses stays the same, its just that there is less air the higher you go
2 c pepsin works in the stomach and thats how pepsi cola got its name. pepsi was marketed as a cure for upset tummys
2007-05-09 22:57:38 · answer #5 · answered by of_the_moon 3 · 1⤊ 2⤋
1 d
2 c
2007-05-10 00:08:43 · answer #6 · answered by Anonymous · 0⤊ 0⤋
a - true about O2 availability at hihg altitudes
c - works in stomach on proteins
2007-05-09 23:21:38 · answer #7 · answered by loza 2 · 0⤊ 0⤋
1,a 2, i think d
2007-05-10 18:57:29 · answer #8 · answered by Anonymous · 0⤊ 0⤋
d
c
2007-05-09 23:42:00 · answer #9 · answered by ~*tigger*~ ** 7 · 0⤊ 0⤋
a and c
2007-05-09 23:00:28 · answer #10 · answered by Anonymous · 0⤊ 0⤋