Essential Biology 6.1: Digestion / Due Date: /
Student Name: / Candidate Number: 002171-xxx

Blog resource:

Cite all sources using the CSE method (or ISO 690 Numerical in Word). The first example has been done for you. Highlight objective 1 command terms in yellow and complete these before class. Highlight objective 2 and 3 command terms in green. These will be discussed in class.

Complete the self-assessment rubric before submitting to Moodle. Avoid printing this if possible.

  1. Define the following terms, giving an example of each.

Macromolecule / “large molecules made up of smaller organic molecules. There are four classes of macromolecules: carbohydrates, lipids, proteins and nucleic acids” (1)
Ingestion
Digestion
Absorption
Assimilation
Excretion
Egestion
Enzyme
Substrate
Optimum pH
Lipase
Protease
Amylase
  1. Explain the need for digestion of large food molecules. (3 marks)
  1. State the name of the type of reaction which uses water to break down a macromolecule.
  2. Explain the need for enzymes in digestion of large food molecules. (5marks)
  1. Review: Explain three factors that affect the rate of enzyme activity. (8 marks)
  1. State the source, substrate, products, and optimum pH for the following types of enzymes:

Carbohydrase (amylase) / Lipase / Protease
Substrate / Carbohydrates / Lipids/ fats / Proteins
Example of enzyme / trypsin
Product(s)
Source of enzyme / pancreas
Optimum pH
  1. Labeland state the function of the structures of the digestive system below:

Name / Function /
a.
Salivary glands / Secrete saliva, includes amylase to being digestion of starch.
b.
c.
d.
e.
f.
g. / Small intestine (duodenum)
h.
i.
j.
k.
  1. Outline the functions of the stomach and small intestine.

Stomach
Acid
Mechanical Digestion
Enzyme
Small intestine
Neutralisation of chyme
Enzymes
Duodenum
Ileum
Peristalsis
  1. The small intestine is made up of many finger-like projections called villi.
  1. Distinguish between absorption and assimilation.
  1. Label the structures of the villus below.
  2. Explain how the structure of the villus is related to its role in absorption and transport of the products of digestion.

Visible structures / Function/ effect
Villi / Increase surface area for absorption
a.
b.
Not visible(epithelial cells) / Function/ effect
Epithelium is one cell thick / Short diffusion path of molecules from lumen into blood
c.
d.
Protein channels in microvilli / Channels for:
Pumps for:
  1. Undigested food molecules are passed to the large intestine.
  1. Outline the functions of the large intestine.

Large intestine
Folds and Villi
Egestion
  1. Distinguish between egestion and excretion.
  1. List four materials that are egested in feces.
  1. Discuss the benefits of a high-fibre diet.

Works Cited

1. Council-Garcia, Cara Lea. Biological Macromolecules. Univesiy of New Mexico Biology. [Online] [Cited: October 31, 2010.]

2. Allott, Andrew.IB Study Guide: Biology for the IB Diploma. s.l.: Oxford University Press, 2007. 978-0-19-915143-1.

3. Taylor, Stephen. Digestion Core. Science Video Resources. [Online] October 31, 2010.

Self Assessment:

Essential Biology / Assessment
Criterion / Complete (2) / Partially complete (1) / Self / MrT
Presentation & Organisation / NA / Complete and neat. All command terms highlighted, tables and diagrams well presented.
Academic Honesty / NA / Sources cited using the CSE (ISO 690 numerical) method, with Works Cited section complete and correct.
Objective 1 understanding / All answers for the following command terms correct: / Most answers for the following command terms correct:
Define Draw Label List Measure State
Objective 2 understanding / All answers for the following command terms correct: / Most answers for the following command terms correct:
Annotate Apply Calculate Describe Distinguish Estimate Identify Outline
Objective3
understanding / All answers for the following command terms correct: / Most answers for the following command terms correct:
Analyse Comment Compare Construct Deduce Derive Design Determine Discuss
Evaluate Explain Predict Show Solve Sketch Suggest
Logic, notation, mathematical working / NA / Answers are presented in a logical and concise manner. SI units used most times, with correct unit symbols and definitions of terms. All mathematical working shown.
Further research / NA / Evidence is apparent of research and reading beyond the textbook and presentations to find correct answers to challenging questions. If any questions are unanswered, this criterion scores zero.
Total (max 10):

Stephen Taylor Bandung International School