Question 1

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Which atom has sp hybridization?

Options :

A : C1

B : C7

C : O1

D : O2

E : None of the above

Answer: A

Question 2

Organisms in which type of relationship both benefit from their association?

Options :

A : Mutualism

B :

Parasitism

C : Commensalism

D : Antagonism

E : None of the above

Answer: A

Question 3

In an aquatic environment, oxygen concentration depends on chemical and physical factors and is greatly

affected by many biological processes. These is much less dissolved oxygen (DO) in aquatic environments

than in dry air. In most aquatic environments, there are only 5 to 10 mL of dissolved oxygen in a liter of

water. Chemical and physical factors, such as salinity, pH, and especially temperature, can affect the DO

concentration and distribution. An experiment was done to study the effect of different salinity levels on DO

in water of varying temperatures. The results are below. Salinity is expressed in parts per thousand (ppt)

and is the content of dissolved salt in water.

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The results of the experiment suggest that at salinities of greater than 30 ppt, it is likely that

Options :

A : dissolved oxygen levels would increase

B : water temperature would increase

C :

aquatic organisms would begin to die

D : there would be no change in dissolved oxygen

E :

the amount of dissolved oxygen would decrease

Answer: A

Question 4

This reaction produces an acidic solution.

Options :

A : HI(aq) + NaOH(aq)

B : H2O(l) + HOCl(aq)

C : K(s) + H2O (aq)

D : Xe(g) + H2O(g)

E : Zn(s) + CuSO4(aq)

Answer: B

Question 5

A small number of rabbits were brought to a farm in Victoria Australia in 1859. The rabbit population quickly

exploded from a few to millions in a short period of time. In the 1950’s a virus carried by mosquitoes,

myxoma, was introduced.

This virus was initially lethal to 99.8% of the rabbit population exposed to it. Future outbreaks of the virus

have not been as successful in reducing the rabbit population.

Which of the following statements is NOT true about the virus?

Options :

A :

The virus coevolves with the rabbit population.

B :

The virus does not undergo any evolutionary pressure.

C : The virus evolves to become less virulent along with the rabbit population evolving to become more resistant.

D : Less virulent strains of the virus become more prevalent in the virus population.

E : The rabbit-myxoma system, without any outside pressures, will coevolve to reach a stable equilibrium.

Answer: B

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