Practice Questions

TLS Online TPP Program

#Question id: 9265

To apply parsimony to constructing a phylogenetic tree,

#9. Diversity of Life Forms

choose the tree that assumes all evolutionary changes are equally probable.
choose the tree in which the branch points are based on as many shared derived characters as possible.
choose the tree that represents the fewest evolutionary changes, in either DNA sequences or morphology.
choose the tree with the fewest branch points.

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TLS Online TPP Program

#Question id: 5556

#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

#5. Developmental Biology

The plasma membrane of the sea urchin egg ________.

TLS Online TPP Program

#Question id: 5558

#5. Developmental Biology

Fertilization of an egg without activation is most like ________.

TLS Online TPP Program

#Question id: 5559

#5. Developmental Biology

During fertilization, the acrosomal contents ________.

TLS Online TPP Program

#Question id: 5560

#5. Developmental Biology

In a newly fertilized egg, the vitelline layer ________.

TLS Online TPP Program

#Question id: 5561

#5. Developmental Biology

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