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Bio Exam 3 Review - Classification of Life
Terms in this set (22)
What cell lacks a nucleus?
A single-celled organism isolated from a deep-sea, hot thermal vent was found to have a cell wall but lacked a nucleus. This organism is a member of the ____________________ domain.
A distinguishing characteristics of fungi...
obtaining nutrients by absorbing them from the environment.
Structures as different as human arms, bat wings, and dolphin fins contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?
-by identifying the bones as being homologous structures
-by proposing that humans, bats, and dolphins share a common ancestor
What evidence most strongly supports the common origin of all life on earth?
all organisms use essentially the same genetic code
Members of two different species possess similar-looking structures that they use in a similar fashion to perform the same function. What describes these structures originating from convergent evolution?
these structures share function but do not share a common ancestry
Dear King Philip Come Over For Good Soup
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
The various taxonomic levels (genera, classes, etc) of the hierarchical classification system differ from each other on the basis of...
Animals that possess homologous structures probably ________________________
evolved from the same ancestor
Best example of a homologous structure _____________
bones in the bat wings and bones in the human forelimb
Some molecular data place the giant panda in the bear family. Consequently, the morphological similarities of these two species are probably due to...
possession of analogous structures
The common ancestors of birds and mammals were very early (stem) reptiles, which almost certainly possessed three-chambered (two atria, one ventricle). Bird and mammals, however, are alike in having four-chambered hearts (two atria, two ventricles). The four chambered hearts of birds and mammals are best described as...
In a comparison of birds in mammals, the condition of having four limbs is...
a shared ancestral charater
Bacteria that live around deep-sea, hot water vents obtain energy by oxidizing inorganic hydrogen sulfide belched out by the vents. They use this energy to build organic molecules from carbon obtained from the carbon dioxide in seawater. These bacteria are ________________.
What is an accurate characteristic of bacterial cell wall?
they prevent cells from bursting in hypotonic conditions
How are archaea most similar to bacteria?
the shape of their chromosomes and plasmids
Scientists have identified two major branches of prokaryotic evolution. What was the basis for dividing prokaryotes into two domains?
genetic characteristics such as ribosomal RNA sequences
What statement about the domain archaea is true?
genetic prospecting has recently revealed the existence of many previously unknown archaean species
What traits of archaeans and bacteria share?
presence of plasma membrane and lack of a nuclear envelope
Why can eukaryotes be considered "combination" organisms?
some of their genes and cellular characteristics were derived from archaea and others from bacteria
Why has the Kingdom Protista been abandoned?
-the kingdom Protista is polyphyletic
-some protists are more closely related to plants, animals, or fungi than they are to other protists
Of the four supergroups of eukaryotes, which one contains red alegae, green, and all land plants
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