The human parasite Mycoplasma genitalium, withone of the smallest genomes of any
ID: 49549 • Letter: T
Question
The human parasite Mycoplasma genitalium, withone of the smallest genomes of any organism that can be grown, as well as Chlamydia trachomatis, an obligate intracellular parasite, are examples of the types of organisms that functional genomics researchers have focused on. What is the main purpose of the study of such genomes?
Select one:
a. These and other obligate parasites or symbiontes are very easy to study.
b. They are very ancient prokaryotes with original small genomes.
c. By studying such genomes, researchers try to discover the basic and essential cellular functions of early life.
d. all of the above
How does comparative data on genes of extant species help us to make estimates of what happened before the phylogenetic event horizon?
Select one:
a. Common genes must have existed for a long time.
b. If the first life-forms consisted of RNA, then current RNA-coding genes must be the ancestral genes.
c. Common functional genes imply the minimal characteristics of early cells.
d. Because so many small genome bacteria are endosymbionts, the earliest cells must have been endosymbionts.
In early cell evolution, why would natural selection favor division into equal-sized daughter cells?
Select one:
a. Splitting into two equal parts is the most energetically efficient method.
b. Two daughter cells is the most efficient way to reproduce sexually.
c. Splitting into two daughter cells is more efficient for horizontal gene transfer.
d. Hypercycles can be maintained by splitting into two.
Explanation / Answer
Mycoplasma genitalium and Chlamydia trachomatis are the organism that are studied so as to discover the basic and essential cellular functions of early life. The Study of genome of Mycoplasma and its comparision with that of bacteria has helped in defining the evolution in these organisms. Having smallest genome, Mycoplasma have the genes which are essential for the living beings. Correct answer is C.
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