Classification
State the seven characteristics of living organisms
Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition
Name the test for protein and state the positive and negative results
Biuret test
positive: turn purple
negative: stay blue
Lacking of which micronutrient can lead to anemia
iron
What circulation does fish have
closed single circulation
during inhalation, what happens to the ventilation system
external intercostal muscle contract
internal intercostal muscle relax
rib cage go upwards and outwards
diaphragm contract
volume of thorax increases
pressure of thorax decreases
State the definition of "species"
In the binomial system, which word represent the organism's species
A group of organisms that can reproduce to produce fertile offsprings
The second word
Name three organelles in plant cells contain DNA
mitochondria
chloroplast
nucleus
What is the intermediate called during enzyme-catalysed reaction?
enzyme-substrate complex
What are the treatments for coronary heart disease
asprin
Angioplasty with stent
Coronary bypass surgery
(description would be fine)
Compare with the atmospheric air, air breathed out by a human contains
more co2 and water vapour
Which of the following is not an important reason for the binomial system of naming organisms?
A. Scientists need to be able to communicate clearly with each other about their work.
B. The common names of many species are outdated and should no longer be used.
C. Different countries may use the same common name for different species.
D. Woodlice are known by more than 50 different common names.
B
State the differences and similarities between osmosis and active transport
Osmosis:
water molecules
high wp to low wp
do not use energy/ATP
do not require carrier proteins
similarity: both require partially permeable membrane
To lower the risk of having coronary heart disease, what kind of diet should we take
low in saturated fat
Describe the structure of an vein and state the adaptation
Thin wall, large lumen, semilunar valve
no need to withstand strong pressure
less resistance to blood flow
prevent blood backflow
Goblet cells are found in the trachea. It is responsible for the secretion of mucus. The mucin in mucus is a glycoprotein.
Which organelle would be found in large number in a goblet cell?
1. lysosomes
2. mitochondria
3. Rough endoplasmic reticulum
4. Secretory vesicles
2 3 4
1. Bryophyta has no roots stem or leaf. Only have rhizoid simple leaves
2. Bryophyta has no vascular tissues
3. Bryophyta has no flowers
4. Bryophyta cannot produce seeds
5. Bryophyta has no fruits
Which of the following reactions release water
a) Nucleotide to DNA
b) Glucose to starch
c) Protein to amino acids
d) Triglyceride to fatty acids
a) and b)
Which system does lacteal belong to? 2 answers
Digestive system
Lymphatic system
See page 3
1.a
2.c
State the minimum number of cell membranes an oxygen molecule must go through from being breathed in until binding with hemoglobin.
3/5
see page 1
D
In an experiment the proteins in the cell surface membrane of a living cell were labelled with a fluorescent dye.
A small area of the membrane was observed using a microscope. A laser was then used to permanently destroy the fluorescence of the dye molecules in this field of view. The fluorescence in this field of view was later seen to return.
What does this experiment show?
A Proteins are found only on the outer surface of cell surface membranes.
B. Proteins in the outer layer of a bilayer do not penetrate into the inner layer.
C. Proteins move freely in the phospholipids of a bilayer.
D. The cell surface membrane of the cell is a bilayer.
fluid mosaic
When investigating the rate of reaction of the enzymme lipase on the hydrolysis of triglycerides, the pH must be maintained at an optimum to prevent the lipase denaturing. What is the reason for this? Why in this case the pH is especially hard to control?
The product of the reaction is fatty acid. The accumulation of fatty acids decreases the pH
See page 2
D
see page 4
to support the airway and prevent collapse