How is the Casparian strip of the endoderm protective?
What will be an ideal response?
Minerals dissolved in soil water enter a cell's cytoplasm only through transport proteins in its plasma membrane. Thus, transport proteins in the endodermis control the types and amounts of ions that move from soil water into the body of the plant. This mechanism protects the plant from some toxic substances that may be in soil water.
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Most simple invertebrates obtain their oxygen by diffusion directly from the surrounding
A. mud. B. air. C. water. D. blood.
The "Central Dogma" of molecular biology described by Watson and Crick describes
the passing of genetic information from DNA to RNA by translation. the passing of genetic information from RNA to protein by transcription. the inheritance of traits between generations. the production of energy in a cell. the directional flow of genetic information in cells.
How many species normally go extinct each year, as estimated by scientists?
A) 1 species per thousand per year B) 1 species per million per year C) 1 species per billion per year D) 1 species per year
What process occurs in cells that become more specialized in their function?
A) cleavage B) gastrulation C) differentiation D) fertilization