WorksheetsChapter 3 and 4
Total questions: 9
Worksheet time: 6mins
Stabilizing selection favours (a) phenotype and acts against both extreme phenotypes
Which ONE is the example for directional selection?
Birth weight of human babies
Number of dark-colored moths during the industrial revolution increases
Small beak size and large beak size finches in the Galápagos Islands increase in number.
Faster racehorses are bred for better performance.
State ONE difference between stabilizing selection and directional selection
Bottleneck effect occurs when a sudden decrease in the original population size due to natural (a) or human action. The small surviving population will have a different allele frequency or gene pool from the original population.
After few generations, both founder and bottleneck effect will lead to alleles may be over represented, under represented or (a) . Both could lead to speciation.
When an apoenzyme associates with its coenzyme, what is the resulting active complex called?
enzyme-substrate complex
active site of enzyme
holoenzyme
cofactor
Prosthetic groups can bind tightly and permanently to the active sites of the enzymes. Coenzymes and metal ions bind loosely and (a) to the active site of the enzyme.
Alanine inhibits pyruvate kinase in glycolysis by changing the conformation of the active site of enzyme. Which type of inhibitor is alanine?
competitive inhibitor
metal ion
non-competitive inhibitor
coenzyme
Give two differences between alanine and competitive inhibitors.
