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TLS Online TPP Program

#Question id: 7700

The legless condition that is observed in several groups of extant reptiles is the result of ________.

#Unit 9. Diversity of Life Forms
  1. their common ancestor having been legless
  2. a shared adaptation to an arboreal (living in trees) lifestyle
  3. several instances of the legless condition arising independently of each other
  4. individual lizards adapting to a fossorial (living in burrows) lifestyle during their lifetimes
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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: 5558

#Unit 5. Developmental Biology

Fertilization of an egg without activation is most like ________.
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 ________.
TLS Online TPP Program

#Question id: 5561

#Unit 5. Developmental Biology

In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are ________.
TLS Online TPP Program

#Question id: 5562

#Unit 5. Developmental Biology

In an egg cell treated with a chemical that binds calcium and magnesium ions, the ________.