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WorksheetsBIOSCORE DB024 : T3 Variation & T4 Biocatalysis
Total questions: 20
Worksheet time: 20mins
Which of the following is polygenic characteristic?
ABO blood group
Ability to taste phenylthiocarbide
Skin colour
Colour blindness
The diagram above shows a type of selection process. The arrow show the direction of natural selection. What type of selection is shown by the diagram above?
Stabilising selection
Artificial selection
Disruptive selection
Directional selection
Which of the following factors causes variation?
I. Random assortment of homologous chromosome during metaphase of mitosis
II. Fusion of gametes of different species to produce viable offspring
III. Crossing over between chromatids of homologous chromosome during meiosis
IV. Presence of dominant and recessive alleles
III ONLY
III and IV
II,III and IV
I,II,III and IV
The diagram above shows a type of selection process. The arrows show the direction of natural selection. Which of the folowing examples can be explained by using the diagram above?
Increased survival rate for newly born human babies with average weight
Increase in antibiotic resistance among pathogenic bacteria
Increased population of average height trees in the forest compared to short and tall trees
Variation caused by environmental factors is less important for evolution compared to variation caused by genetic factors because?
it only affects phenotype of an organism
its effect is temporary
its effect can be suppressed by genetic factor
its effect only occurs in few organisms
Which of the following is caused by artificial selection?
An increase in the population of melanic peppered moth around industrial areas
An increase in the resistance of aphids to insecticide
An increase in the milk production in cows
An increase in the resistance of pathogenic bacteria to antibiotic
The best definition of species involves
interbreeeding capability
morphological similarities
habitat similarities
physiological similarities
Speciation that is caused by breeding occuring at different times of the day is called
(a)
The frequency of the melanic form of peppered moth, Biston betularia found in industrialised areas of Britain is increased compared to the pale form of peppered moth. This is the result of
Adaptive radiation
Artificial selection
Speciation
Natural selection
Which of the following statements best describes what will most likely occur to the moth populations in the image above?
The light moths will be captured by predators more easily than the dark moths, and the population of dark moths will rise.
The light moths will be captured by predators more easily than the dark moths, and the population of light moths will rise.
The dark moths will be captured by predators more easily than the light moths, and the dark moths will probably go extinct.
The light moths will change their wing color to match that of the dark moths.
Which of the following statements best describes what will most likely occur to the moth populations in the image above?
The light moths will be captured by predators more easily than the dark moths, and the population of dark moths will rise.
The light moths will be captured by predators more easily than the dark moths, and the population of light moths will rise.
The dark moths will be captured by predators more easily than the light moths, and the dark moths will probably go extinct.
The light moths will change their wing color to match that of the dark moths.
Watch the animation and identify the hypothesis involved
Lock and Key hypothesis
Induced Fit hypothesis
Enzyme-Substrate hypothesis
Only a small amount of enzyme is needed for a large amount of substrate because _______
Enzymes do not change at the end of a reaction and as such can be reused
A small amount of enzyme can provide enough energy to continue the reaction
More enzymes are formed while reaction takes place
Enzymes act till completion of a reaction or not at all
The protein part of an enzyme that binds to prosthetic group to form a functional enzyme is called
holoenzyme
apoenzyme
coenzyme
conjugated protein
According to the induced fit hypothesis of enzyme catalysis, which of the following is CORRECT?
The binding of the substrate slightly changes the shape of the enzyme’s active site
The binding of the substrate depends on the shape of the active site
Some enzymes change their structure when activators bind to the enzyme
A competitive inhibitor can outcompete the substrate for the active site
Parts of the enzyme molecule that interact with a substrate are called:
cofactors
active sites
induced-fit models
reaction sites
How does enzyme lower the activation energy?
Bring substrate closer to each other
Increase the kinetic energy of substrate
Weakening the bonds inside the substrate
Bring substrate together into correct orientation
Give one similarities between competitive inhibitor and non-competitive inhibitor action
Both caused enzyme's conformation changed
The maximum rate of reaction is not reached
Reaction become slower
Rate of reaction can be increased by increasing the substrate concentration
Based on the graph shown above
i. Enzymes are denatured
ii. Enzyme's active site are fully occupied with substrate
iii. Active site of enzyme is no longer complementary with substrate
iv. The rate of reaction increases with increasing substrate concentration
i and ii
i and iii
ii and iii
ii and iv
The rate of reaction of thrombokinase in prothrombin decrease as the concentration of Ca2+ reduced. Which of the following is the role of Ca2+ ?
Competitive inhibitor
Cofactors
Coenzyme
Prosthetic group
