Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?

A) formation of three embryonic cell layers
B) movement and alignment of many embryonic cells
C) the formation of a gastrula
D) the formation of specialized adult tissues


Answer: D

Biology & Microbiology

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Examine the following figure depicting homologous bones in mammalian forelimbs. Match each letter of the figure with the appropriate bone structure. Note that homologous bones are pictured in the same color.

Biology & Microbiology

Which of the following statements is false?

A. Oxygen debt is the difference between an animal's immediate need for oxygen at the start of activity versus energy supplied by anaerobic metabolism. B. Recovery metabolism involves increased heart rates and respiration rates. C. An animal's oxygen consumption remains elevated for a brief period after activity ends. D. Recovery metabolism allows a cell to replenish depleted ATP stores and metabolize lactic acid. E. None of these statements is false.

Biology & Microbiology

The facilitation model of succession involves strong competitive interactions among colonizing species

Indicate whether the statement is true or false

Biology & Microbiology

If the figure above is an accurate depiction of relatedness, then which of the following should be correct?

1. The entire tree is based on maximum parsimony. 2. If all species depicted here make up a taxon, this taxon is monophyletic. 3. The last common ancestor of species B and C occurred more recently than the last common ancestor of species D and E. 4. Species A is the direct ancestor of both species B and species C. 5. The species present at position 3 is ancestral to C, D, and E. A) 1 and 3 B) 3 and 4 C) 2, 3, and 4 D) 1, 2, and 3

Biology & Microbiology