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TLS Online TPP Program

#Question id: 5645

A reproductive difference between sea urchins and humans is ________.

#Unit 5. Developmental Biology

  1. the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization

  2. sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm

  3. sea urchins, but not humans, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs

  4. sea urchin zygotes get their mitochondria from the sperm, but human zygotes get their mitochondria from the egg

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TLS Online TPP Program

#Question id: 8895

#Unit 9. Diversity of Life Forms

What is one characteristic that separates chordates from all other animals?
TLS Online TPP Program

#Question id: 8896

#Unit 9. Diversity of Life Forms

Chordate pharyngeal slits appear to have functioned first as
TLS Online TPP Program

#Question id: 8897

#Unit 9. Diversity of Life Forms

Which of the following statements would be least acceptable to most zoologists?
TLS Online TPP Program

#Question id: 8898

#Unit 9. Diversity of Life Forms

Which extant chordates are postulated to be most like the earliest chordates in appearance?
TLS Online TPP Program

#Question id: 8899

#Unit 9. Diversity of Life Forms

A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
TLS Online TPP Program

#Question id: 8900

#Unit 9. Diversity of Life Forms

Which of the following statements about craniates is (are) correct?
1. Craniates are more highly cephalized than are non-craniates.
2. Craniatesʹ genomic evolution includes duplication of clusters of genes that code for transcription factors.
3. The craniate clade is synonymous with the vertebrate clade.
4. Pharyngeal slits that can assist in gas exchange originated in craniates,
5. The two-chambered heart originated with the early craniates.