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Biology Journal 10/1/2013. What kind of reaction is shown? Write out the reaction as words: Sucrose + _______ → ________ + _______ 3. When might this reaction be happing in your life?. →. +. +. H 2 O. Biology Journal 10/1/2013.

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biology journal 10 1 2013

Biology Journal 10/1/2013

What kind of reaction is shown?

Write out the reaction as words:

Sucrose + _______ → ________ + _______

3. When might this reaction be happing in your life?

+

+

H2O

biology journal 10 1 20131

Biology Journal 10/1/2013

What kind of reaction is shown? Decomposition through hydrolysis

Write out the reaction as words:

see below

3. When might this reaction be happing in your life? This happens whenever you eat sucrose (sugar)!

+

+

H2O

sucrose + water → fructose + glucose

We will now learn how the digestive system makes this happen!

slide3

What do the parts in the picture represent?

A =

B =

C =

D =

E =

Substrate

Enzyme

Active site

Enzyme-substrate complex

Products

What kind of reaction is happening in this picture?

Decomposition

slide7

Large food molecules need to be digested or catabolized (broken down by an enzyme –usually hydrolysis) before the nutrients can be absorbed.

  • Reactants are:
  • Big (too big to be absorbed into a cell)
  • Usually insoluble
  • Products are:
  • Small enough to be absorbed into a cell
  • Usually soluble
slide15

Biology Journal 10/2/2013

Complete the table!

slide17

Biology Journal 10/2/2013

What order are these organs encountered in the digestive tract (from mouth to anus)? Put them in the correct sequence.

Mouth

Large intestine

Small intestine

Colon

Stomach

Esophagus

Liver

Anus

Pancreas

slide18

Biology Journal 10/2/2013

What order are these organs encountered in the digestive tract (from mouth to anus)? Put them in the correct sequence.

Mouth

Esophagus

Stomach

Small intestine

Liver and Pancreas

Large intestine

Colon

Anus

slide19

Biology Journal 10/4/2013

Complete the table!

slide22

Biology Journal

What is activation energy? What do enzymes do to activation energy?

Activation energy is the energy input required to make a reaction happen.

Enzymes lower the activation energy of a reaction, thus it’s faster!

slide23

Stomach

  • Has a pH of 2 (because of HCl)
  • pH kills almost all bacteria, viruses and denatures proteins
  • Contains pepsin (a protease whose optimum pH is 2)
  • Stretch-receptors trigger release of enzymes
slide25

Small Intestine

  • Absorbs molecules through villi
  • Long! (around 7 meters (23 feet) long)
slide26

Small Intestine

  • Liver and Pancreas add enzymes to finish breaking down food
  • Bile ducts and pancreatic duct meet up and transfer bile and enzymes to duodenum
slide27

Small Intestine

  • Villi are finger-like projections that maximize surface area for absorption of molecules.
slide28

Villi are like a bath towel. The more surface area, the faster and more efficient the absorption.

slide29

Molecules are absorbed by villi, meaning the nutrients pass from the gut into the blood. These molecules are assimilatedby cells, meaning cells take the molecules and integrate them into themselves.

slide30

Large Intestine

  • Absorbs water from food (not nutrients)
  • Has large stores of bacteria
slide31

How does diarrhea help cure you from an illness?

  • During diarrhea, the small intestine stops absorbing water and instead attempts to purge all contents of digestive system.