BIO 117 FINAL (PRETEST 2)
A particular species of protist has obtained a chloroplast via secondary endosymbiosis. You
know this because the chloroplasts _____.
have three or four membranes
Why are protists considered paraphyletic?
They include some but not all descendants of their most recent common ancestor.
A person is looking at microorganisms in a sample of water. Which feature would identify a
microorganism as a protist instead of a prokaryote?
a nucleus
What material is NOT used by protists in hard outer coverings?
lignin
During gastrulation, ________.
three germ layers form
A mutation that inactivates a gene required for apoptosis in the digits of developing mice
would result in ____________.
a mouse that retains webbing between its digits
What happens during gastrulation?
Massive movements of cells make the primary body axes visible and organize the three
embryonic tissues
The vertebrate ectoderm is the origin of the ________.
nervous system
Ovoviviparous species are distinguished by what trait?
Offspring are nourished via the egg's yolk prior to live birth.
Put the following events of embryonic development in order:
Cell cleavage [a]
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