CHEMISTRY HIGH SCHOOL

Which part of the body contains enzymes that break down protein? A. Skin B. Brain C. Stomach D. Teeth

Answers

Answer 1
Answer:

Enzymes for the breakdown of protein are present in the stomach.

What are the enzymes involved in the digestion of proteins in our body?

Pepsin

  • In the presence of an acid, the stomach secretes pepsins, which are proteolytic enzymes.
  • About 10–15% of the digestion of proteins is done by the pepsins.

Trypsin

  • It is secreted in an inactive form, trypsinogen, by the pancreas.
  • Trypsinogen is then activated in the small intestine by the enzyme enterokinase and further helps in protein digestion.

Chymotrypsin and elastase

  • These are also secreted by the pancreas.
  • Chymotrypsin and elastase are activated by trypsin.
  • Responsible for initiating the hydrolysis of protein chains into peptides.

Carboxypeptidases

  • The enzymatic action of carboxypeptidases, which are also released by the pancreas, causes the subsequent breakdown of the peptides into smaller molecules and then to individual amino acids.

Learn more about protein digestion here:

brainly.com/question/15604041

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Answer 2
Answer:

The answer to your questions is C. Stomach

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What is the pressure in a gas container that is connected to an open-end u-tube manometer if the pressure of the atmosphere is 742 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

Answers

First, know that 8.60 cm = 86.0 mm, which is equivalent to an 86.0 torr pressure difference between the atmosphere and the container. 

In this situation the pressure in the container is less than the atmosphere.  

742 - 86 = 656 torr

Answer: 656 mmHg

Explanation:

Manometers are used to measure the pressure in a container by comparing it to normal atmospheric pressure.

First convert the atmospheric pressure to mmHg

1 torr = 1 mmHg

Therefore, the atmospheric pressure = 742 mmHg

Since the arm connected is higher than the level of the Mercury open to the atmosphere, then the gas pressure is lower than the atmospheric pressure.

Hence,

Pgas = Patm - change in height

Pgas = 742 mmHg - 8.6 cmHg

Balance the unit: 10 mm = 1 cm

Then,

Pgas = 742 mmHg - 86 mmHg

Pgas = 656 mmHg

The gas pressure in the container is 656 mmHg.

A certain substance melts at a temperature of . But if a sample of is prepared with of urea dissolved in it, the sample is found to have a melting point of instead. Calculate the molal freezing point depression constant of . Round your answer to significant digits.

Answers

Answer:

2.2 °C/m

Explanation:

It seems the question is incomplete. However, this problem has been found in a web search, with values as follow:

" A certain substance X melts at a temperature of -9.9 °C. But if a 350 g sample of X is prepared with 31.8 g of urea (CH₄N₂O) dissolved in it, the sample is found to have a melting point of -13.2°C instead. Calculate the molal freezing point depression constant of X. Round your answer to 2 significant digits. "

So we use the formula for freezing point depression:

  • ΔTf = Kf * m

In this case, ΔTf = 13.2 - 9.9 = 3.3°C

m is the molality (moles solute/kg solvent)

  • 350 g X ⇒ 350/1000 = 0.35 kg X
  • 31.8 g Urea ÷ 60 g/mol = 0.53 mol Urea

Molality = 0.53 / 0.35 = 1.51 m

So now we have all the required data to solve for Kf:

  • ΔTf = Kf * m
  • 3.3 °C = Kf * 1.51 m
  • Kf = 2.2 °C/m

As the number of effective collisions between reacting particles increases the rate of reaction

Answers

the rate of reaction increases 

Approximately how long has the Moon been geologically inactive?A. 1 billion years
B. 3 billion years
C. 4 billion years
D. 4.5 billion years

Answers

The moon had been geologically inactive for B. 3 billion years

A solution is considered neutral if its pH is _________ 7.a. equal to
b. less than
c. greater than

Answers

When the solution has a ph equal to 7

Answer:

a, equal to

Explanation:

Which of these following have a positive charges

Answers

Talking about ions, a cation has a positive charge. That means a positive charge is gained by an atom that gives out electrons. 
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