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TLS Online TPP Program

#Question id: 5227

One of the characteristics of retrotransposons is that

#Unit 11. Evolution and Behavior

  1. they code for an enzyme that synthesizes DNA using an RNA template.

  2. they are found only in animal cells.

  3. they generally move by a cut-and-paste mechanism.

  4. they contribute a significant portion of the genetic variability seen within a population of gametes.

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TLS Online TPP Program

#Question id: 5553

#Unit 5. Developmental Biology

The notochord is a ___ structure in vertebrate embryos that lies under the ___, and is bordered by ___.
TLS Online TPP Program

#Question id: 5555

#Unit 5. Developmental Biology

The formation of the fertilization envelope requires an increase in the cytosolic concentration of ________.
TLS Online TPP Program

#Question id: 5556

#Unit 5. Developmental Biology

Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief ________.
TLS Online TPP Program

#Question id: 5557

#Unit 5. Developmental Biology

The plasma membrane of the sea urchin egg ________.
TLS Online TPP Program

#Question id: 5559

#Unit 5. Developmental Biology

During fertilization, the acrosomal contents ________.
TLS Online TPP Program

#Question id: 5560

#Unit 5. Developmental Biology

In a newly fertilized egg, the vitelline layer ________.