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WorksheetsEcology, Selection & Speciation and Biocatalysis SB025
Total questions: 25
Worksheet time: 24mins
Suppose that the number of bird species is determined mainly by the number of vertical strata found in the environment. If so, in which of the following biomes would you find the greatest number of bird species?
Savanna
Temperate broadleaf forest
Temperate grassland
Tropical rain forest
The lake zone that receives the highest amount of light is.......
Littoral Zone
Photic Zone
Aphotic Zone
Limnetic Zone
A fish species known for its success in the aphotic zone may have which of the following characteristics?
I) symbioses with photosynthetic organisms
II) highly developed chemoreception
III) adaptations for burrowing
IV) adaptations for sit-and-wait predation
I and III
II, III, and IV
I, II, and IV
I, II, and III
The occurrence of large beaks and small beaks in the absence of medium-sized beaks in finches is an example of
directional selection
disruptive selection
the founder effect
adaptive radiation
During exponential growth, a population always _____.
Quickly reaches its carrying capacity
Grows at its maximum per capita rate
Cycles through time
Loses some individuals to emigration
In the figure above, which of the arrows represents the carrying capacity?
A
B
C
None
Three populations of crickets look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?
A temporal reproductive isolating mechanism
A postzygotic isolating mechanism
A gametic reproductive isolating mechanism
A behavioral reproductive isolating mechanism
The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia. Both male and female hybrids exist, but when they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
Prezygotic isolation exists between the two frog species.
These two species are likely in the process of fusing back into one species.
Postzygotic isolation exists between the two frog species.
The hybrids form a separate species under the biological species concept.
Most causes of speciation are relatively slow, in that they may take many generations to see changes, with the exception of _____.
Natural selection
Colonization
Founder effect
Polyploidy
According to the biological species concept, for speciation to occur, _____.
The number of chromosomes in the gene pool must change
Changes to centromere location or chromosome size must occur within the gene pool
Large numbers of genes that affect numerous phenotypic traits must change
At least one gene, affecting at least one phenotypic trait, must change
Prezygotic isolating mechanism include
I Temporal isolation
II Ecological isolation
III Mechanical isolation
IV Hybrid sterility isolation
I and II
I, II and III
I, III and IV
II, III, and IV
A virus killed most of the seals in the North Sea (e.g., dropped the population from 8000 to 800). In an effort to help preserve the species, scientists caught 20 seals and used them to start a new population in the northwest Pacific Ocean. Which of the following factors would most likely have the least impact in this new population?
Genetic drift
Random mating
Founder effect
Bottleneck effect
Allopatric speciation occurs when...
One population of the same species is separated geographically and can no longer interbreed.
Two populations of the same species within the same geographic area share a gene pool
One population of different species are separated geographically and can no longer interbreed
Two populations of different species within the same geographic area share a gene pool
Which of the following statements best describes an allosteric binding site?
It is a binding site that can accept a wide variety of differently shaped molecules.
It is a binding site, which is separate from the active site, and affects the activity of an enzyme when it is occupied by a molecule or ion
It is a description of an active site which has undergone an induced fit.
It is a description of an active site which has undergone denaturation.
What term is used for a non-protein organic molecule that is required by some enzymes in order to catalyse a reaction on a substrate?
Prosthetic group
Cofactor
Coenzyme
ATP
Which of the following statements is NOT an effect of enzymes on biochemical reactions?
I. It lowers the activation energy of reaction.
II. It reduces the rate of reaction.
III. It increases the rate of reaction.
IV. It breaks the chemical bonds of substrate.
I and IV
II and IV
II and III
III and IV
How does an enzyme increase the rate of reaction?
By shifting the equilibrium point of reaction
By supplying the energy required to start the reaction
By increasing the rate of random collision of molecules
By bringing the reactant molecules to the correct orientation
What is the function of malonate in a reaction involving succinate dehydrogenease enzyme?
Substrate
Product
Competitive inhibitor
Non competitive inhibitor
Which of the following is a coenzyme?
Zinc
Haem
FAD
Vitamin B6
Enzymes are composed of which of the following monomers?
Amino acid
Nucleic acid
Monosaccharides and amino acid
Fatty acid
According to the induced fit hypothesis of enzyme catalysis, _____.
The binding of the substrate 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
The active site creates a microenvironment ideal for the reaction
Increasing the substrate concentration in an enzymatic reaction could overcome which of the following?
The need for a coenzyme
Allosteric inhibition
Insufficient cofactors
Competitive inhibition
You collect data on the effect of pH on the function of the enzyme catalase in human cells. Which of the following graphs would you expect?
A
B
C
D
