Why do some leaves change color (red, yellow, orange, etc.) in the fall?
A. When leaves die, the chlorophyll molecules are no longer visible.
B. Cold weather denatures the chlorophyll molecule, and it begins to reflect different colors.
C. The chlorophyll molecule breaks down and other pigments now become visible.
D. The chlorophyll molecule is modified to absorb different wavelengths of light.
Answer: C
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A polypeptide has 115 amino acid residues. Which two values show the lengths predicted if the polypeptide is an ? helix as compared to a continuous ? strand?
A. 621 Å, 403 Å B. 414 Å, 403 Å C. 173 Å, 403 Å D. 414 Å, 201 Å E. 173 Å, 210 Å
You discover a new life-form, and study it under an electron microscope. You find that its cells have no organelles, a peptidoglycan cell wall, and fatty acids in its plasma membrane. You conclude that the new life-form is in which domain?
A. Bacteria B. Archaea C. Eukarya D. Protista E. Animalia
Explain the difference between an angiosperm seed and a gymnosperm seed
What will be an ideal response?
During animal development, changes in cell position occur extensively during _____.
Fill in the blank(s) with the appropriate word(s).