Plants maintain higher levels of phytochrome at their growing tips where phytochrome plays important roles in growth responses to light. Phytochrome levels are also high in areas of the plant that are "greening". What does this suggest about the role of phytochrome in these "greening" zones?
A. Phytochrome is facilitating the transcription and translation of photosynthesis related proteins.
B. In these areas, phytochrome is the first step in the electron transport chain of photosynthesis.
C. Phytochrome is absorbing green wavelengths of light.
D. Phytochrome is facilitating the migration of chlorophyll pigments from other areas of the plant.
Answer: A
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Select all that apply. 1. The presence of two or more alleles fro a particular trait in the gene pool 2. The alleles at a particular position on homologous chromosomes of an individual with two true-breeding parent for different alleles 3. the alleles at a particular position on homologous chromosomes of an individual who expresses a recessive trait 4. two of the same alleles are found in a particular position on homologous chromosomes 5. two alleles that are positioned on the same chromosome
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During which phase of meiosis does the nuclear envelope break down?
a. prophase I and II b. metaphase I and II c. anaphase I and II d. telophase I and II
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