Exam 12: Microbial Evolution and Systematics

The earliest RNA probably functioned in

Can gene frequencies change in the absence of selection? Why or why not?

What two gases were most abundant on early Earth?

A key concept in evolution is that all mutations are

The 16S rRNA sequence is an approximately 1,500 bp linear strand of single stranded RNA.

The atmosphere of primitive Earth is usually classified as an oxidizing atmosphere.

What was produced by photosynthesis before the cyanobacterial lineage developed on Earth?

The domains of life arose as barriers between gene exchange evolved between organisms.

One phenotypic trait used for species identification and description is the analysis of the types and proportions of the fatty acids present in the cytoplasmic and outer membranes.The methodology employed is often nicknamed FAME.

It is believed that phototrophy arose approximately 3.3 billion years ago in

Draw a rooted phylogenetic tree containing seven organisms labeled A to G.Label your tree with the following terms: branches,extant taxa,nodes,last common ancestor,and an outgroup.

The earliest nucleic acid was probably a simple DNA molecule.

The primary domains were founded based on comparative ribosomal RNA gene sequencing.

Systematic analysis now commonly includes ________ to identify,characterize,and determine relationships between new strains of bacterial species.

LUCA is

All unicellular organisms belong to the same domain of life.

In taxonomy,family is a more general term than order.

Multilocus sequence typing involves sequencing several different

Microorganisms were probably restricted to the oceans and subsurface environments until

Chemical reactions involving ________ have been proposed as energy-yielding reactions for primitive organisms.