1.) You\'ve discovered a uni-cellular organism that you have determined is eithe
ID: 193110 • Letter: 1
Question
1.) You've discovered a uni-cellular organism that you have determined is either in the kingdom Eubacteria or Fungi. What piece of evidence would you look for to determine which of these two kingdoms it belongs to?
Select one:
a. presence or absence of cell walls.
b. if it is uni-cellular, it must be Eubacteria.
c. presence or absence of nucleus and organelles.
d. whether or not it extracts and uses energy from its environment.
2.) Imagine that you measure a population of animals that are on average shorter than the previous generation of animals. What might have caused this change in average height?
Select one:
a. Natural Selection: Perhaps only short individuals could access a food resource and so more short individuals survived and reproduced.
b. Mutation: Perhaps a novel mutation in the new generation caused one individual to be unusually short, and thus decreased the average height.
c. Genetic Drift: Perhaps this was just a random event and if you look at several generations you would find that, over the longer term, there would be no overall change in height.
d. All of the above.
3.) Nucleotides are molecules that:
Select one:
a. can pair with each other as part of a DNA double helix.
b. are composed only of a nitrogenous base.
c. are not a component of RNA.
d. are very sweet.
4.) Which of the following is not a characteristic of antigenic shift?
Select one:
a. The virus is transferred from an animal host.
b. There is a gradual change in the virus.
c. The RNA strands of multiple virus strains can be reassorted.
d. The subtype of the virus can change.
Explanation / Answer
Question 1:
Characteristics of Eubacteria:
Characteristics of Fungi:
ANSWER: c) presence or absence of nucleus and organelles.
Question 2:
Genetic drift:
genetic drift is the change in the frequency of an existing gene variant (allele) in a population due to random sampling of organisms.
It results in disappearance of particular genes as individuals die or do not reproduce.
Mutation:
Mutation is the process by which a nucleotide sequence of a organism is altered. Might result in the change in the phenotype of the gene
Natural selection:
Variations in genotype results in the organisms chance of survival to be increased.
ANSWER: d) All of the above
Question 3:
Nucleotides:
ANSWER: a) can pair with each other as part of the DNA double helix.
Question 4:
Antigenic shift:
Is the process by which 2 or more different viruses combine to form new subtype having mixture of the surface antigen of 2 or more original strains. Example: Influenza virus.
ANSWER: a) The virus is transferred from an animal host
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