Formed by cholesterol
Several major oxysterols arise
as intermediates in the
cholesterol to bile acids or
CH25H, cholesterol 25hydroxylase
Control of cholesterol
synthesis and uptake
BIOL 3202 Nutritional Biochemistry
Rm 5S/15, Kadoorie Building
Email: [email protected]
energy, protein and fatty acid & tutortials
Chi Bun Chan
lipoproteins, cholesterol and bi
1) The majority of code in the VirtualBox Open Source Edition (OSE) is
copyrighted by Oracle Corporation. This code is combined with third-party code
that was originally released under licenses which the Free Software Foundation
INTRODUCTION OF HORMONAL SYSTEMS AND
Professor BKC CHOW (6 lectures)
Office: Rm4N12 KBSB
Email: [email protected]
use antibodies to stain protein
where receptors of
29.1 ORIGIN OF LIFE
Oparin: hypothesis -> inorganic substances (methane, ammonia, hydrogen, water vapour) combined
to form organic molecules
Stanley Miller: gas mixture, subjected to heat + electric sparks -> found organic molecules (eg.
Nucleus: Present Absent
Number of chromosomes: More than one One-but not true chromosome: Plasmids
Cell Type: Usually multicellular Usually unicellular (some cyanobacteria may be
True Membrane bound Nucleus:
16.3 CENTRAL NERVOUS SYSTEM
BRAIN is enclosed by CRANIUM.
CNS (brain + spinal cord) is covered by 3 membranes.
- Left & right cerebral hemispheres
- Highly folded surface -> hold more neurones in a limited space -> efficient communication
6.1 PROCESSES OF NUTRITION
Ingestion: food is taken into alimentary canal
Digestion: food is broken down into soluble & simple molecules
Absorption: digested food molecules enter circulatory system
Assimilation: absorbed food molecules are taken up by c
22.1 WHAT IS RESPIRATION?
Respiration = the process by which organisms release energy from food through the controlled
oxidative breakdown of food.
-> releases chemical energy slowly and gradually
(45% in energy carrier ATP, 55% lost as heat for mainta
19.1 DIVERSITY OF LIFE FORMS
Biodiversity = variety of life forms
- study a large number of organisms systematically
- identify an organism more easily by matching it with characteristics of a group
- understand the evoluti
Levels of organization
Species -> Population -> Community -> Ecosystem -> Biome -> Biosphere
Ecosystems in HK
Freshwater stream, mangrove, rocky shore (hard shell, attach to rocks), woodland, grassland
20.1 ECOSYSTEM: ABIOTIC FACTORS
Biology is the study of organisms.
Branches: molecular biology / cytology / anatomy / taxonomy / ecology
Characteristics of organisms
1. Nutrition: obtain food for energy & to maintain life
2. Respiration: break down food to get energy for body
DISADVANTAGES/External environment issues
Finance from personal accounts of business owner
e.g. Sole Traders and Partnerships
Finance from family r
CHAPTER 2 (CELLS AND MOLECULES OF LIFE)
1. Distinguish sER and rER
Surrounded by a double membrane
Manufactures hormones and enzymes
Most abundant at sites of active transport
Abundant in cells secreting lipids
Chapter 2 Question Bank
The cell as the basic unit of life
The diagram below shows some cells from a plant epidermis.
Which of the following statements of X is/are correct?
(1) It c
Nutrition in humans
The diagram below shows the set-up of three test tubes.
The pH of the contents of each test tube was recorded at the beginning and again
How did the pH
Chapter 5 Question Bank
Food and humans
Directions: The following two questions refer to the diagram below, which
sample of orange juice. In the food test, solution X
changed to colourless.
New Senior Secondary Mastering Biology
Which of the following are studied in biology?
(1) the structure of cells
(2) the interrelationships
HKDSE BIOLOGYConcepts and Applications
Chapter 4 Movement of substances across the cell membrane
Combined Science: Chapter 4 Movement of substances across the cell membrane