If a plant species exhibits maternal inheritance for leaf pigmentation, what is the phenotype of the parents of a variegated (green and white leaves) plant?
A. The maternal plant must be white and the paternal plant must be green.
B. The maternal plant must be green and the paternal plant must be white.
C. The maternal plant must be variegated and the paternal plant can be any color.
D. Both the maternal and paternal plant must be variegated.
E. The maternal plant must be variegated and the paternal plant must be white.
C. The maternal plant must be variegated and the paternal plant can be any color.
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Mitosis is involved in
a. asexual reproduction and growth. b. asexual reproduction and genetic diversity. c. sexual reproduction and growth. d. sexual reproduction and genetic diversity.
What step occurred first in the evolution of life?
a. formation of protein-RNA systems b. formation of lipid spheres c. formation of membrane-bound protocells d. formation of ATP e. spontaneous formation of lipids, proteins, carbohydrates, and nucleotides
What is the role of actin in eukaryotic cells?
A. It forms the centromere that holds sister chromatids together. B. It forms the spindle that pulls chromosomes apart. C. It is necessary for the DNA to replicate. D. It provides strength in stretching and compression of a cell. E. It forms the structures inside flagella that allow the bending motion for cell motion (swimming).
Sympathetic effects include
a. decreased heart rate. b. decreased salivation. c. narrowing of pupils. d. constriction of the airways. e. none of these