WGU D027 OA REMEDIATION
MICHELLE'S VERSION EXAM
QUESTIONS WITH CORRECT
ANSWERS 100%
Question : Which one of the following is a selective
advantage of simple multicellularity over single-celled organisms?
CORRECT ANSWER : Multicellularity helps organisms
avoid predation.
Question : Which one of the following organisms has
coenocytic organization?
CORRECT ANSWER: some green algae
Question : Why do mitochondria and chloroplasts have small
genome?
CORRECT ANSWER : They have small genomes because
over time, much of their nucleic acid has migrated to the host cell nucleus.
Question : Some slime molds make structures called
plasmodia which:
CORRECT ANSWER : contain many nuclei in one large
cell.
Question : Chloroplasts have outer and an inner membranes
that separate the stroma and thylakoids from the cytoplasm.What is believed to be the origin of the outer membrane of the chloroplast?
CORRECT ANSWER : It is the remnant of the ancient host
cell's plasma membrane following endocytosis of the cyanobacteria.
Question : The peppered moth provides a well-known
example of natural selection. The lightcolored form of the moth was predominant in England before the industrial revolution. In the mid-nineteenth century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene. By about 1900, approximately 90% of the moths around industrial areas were dark colored, whereas light- colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the soot-
darkened background in industrial areas and therefore were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and the dark-colored moths have been disappearing. Should the two forms of moths be considered separate species?
CORRECT ANSWER : No
Question : 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?
CORRECT ANSWER : a prezygotic isolating mechanism
Question : How are two different species most likely to
evolve from one ancestral species?
CORRECT ANSWER : allopatrically, after the ancestral
species has split into two populations
Question : polytomy is a graphical depiction of what type of
relationship between groups?
CORRECT ANSWER : The common ancestor node with no
resolution among descendant groups.
Question : One reason we see relatively little genetic variation
among human regional populations is that:
CORRECT ANSWER : humans migrated out of Africa so
recently that we haven't had enough time for regional variation to accumulate
Question : The term "n" refers to the size of a population, that
is, the number of individuals in that population. In general, in a sample of n individuals, the frequency of an allele is
CORRECT ANSWER: he number of occurrences of the
allele divided by twice the number of individuals in the sample (2n).
Question : If a population is not in Hardy-Weinberg
equilibrium, we can conclude that:
CORRECT ANSWER : evolution has occurred because one
of the assumptions of the Hardy-Weinberg equilibrium has been violated.