GRE Subject Test: Biology : Identifying Animals
年代tudy concepts, example questions & explanations for GRE Subject Test: Biology
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Example Questions
Example Question #1 :年代peciation And Phylogenetics
Which of the following is not necessary for designation as a chordate?
I. A notochord
II. Vertebrae
III. A post-anal tail
IV. Gill arches
V. A dorsal, tubular nervous system
III
II
V
IV
I
II
Chordates must have, at some point in their embryogenesis, all features except vertebrae. Although the vast majority of chordates are vertebrates,Amphioxushas only a notochord. This primitive organism never develops vertebrae. Man has gill arches, and remnants of these are seen in certain congenital malformations. The notochordal remnants can give rise to the tumor known as a chordoma. The brain has ventricles (it is tubular) and it is certainly dorsal. Finally, human tail persists in about one per million live births.
Example Question #1 :年代peciation And Phylogenetics
Which of the following statements about chordates is true?
All chordates are vertebrates
Their anus forms from the blastopore
They are protostomes
They lack a coelom
Their anus forms from the blastopore
The phylum chordata has a few key characteristics. They are deuterostomes, meaning that the anus arises from the blastopore. They have a coelom that arises from the mesoderm during development, and at some point they have a tail, pharyngeal slits, and a notochord.
Vertebrata is a subphylum of chordata, so not all chordates are vertebrates (though all vertebrates are chordates).
Example Question #1 :Identifying Animals
Which of the following organelles is/are mainly present in animal cells?
I. Peroxisome
II. Centrioles
III. Flagella
III only
I only
II only
I and III
II and III
II only
Centrioles are generally only found in animal cells, but have been found in a variety of eukaryotes. There are a small subset of plants that do contain centrioles. Some plant cells have flagella and peroxisomes.
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