LECTURE 7

QUIZ CHAPTER 3 and 4

Fill in the Blank

Stabilizing selection favours _______________ phenotype and acts against both extreme phenotypes

Multiple Choice

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.

Open Ended

State ONE difference between stabilizing selection and directional selection

Fill in the Blank

Bottleneck effect occurs when a sudden decrease in the original population size due to natural ___________ or human action. The small surviving population will have a different allele frequency or gene pool from the original population.

Fill in the Blank

After few generations, both founder and bottleneck effect will lead to alleles may be over represented, under represented or __________. Both could lead to speciation.

Multiple Choice

When an apoenzyme associates with its coenzyme, what is the resulting active complex called?

• enzyme-substrate complex

• active site of enzyme

• holoenzyme

• cofactor

Fill in the Blank

Prosthetic groups can bind tightly and permanently to the active sites of the enzymes. Coenzymes and metal ions bind loosely and ___________ to the active site of the enzyme.

Multiple Choice

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

Open Ended

Give two differences between alanine and competitive inhibitors.