The division of a bacterial cell occurs as the
A. actin and microtubules constrict the cytoplasm.
B. chromosomes are pulled toward the ends of the cell.
C. cell wall develops cracks around the equator of the cell.
D. new membrane and cell wall materials begin to grow and form a septum.
Answer: D
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Which statement about secondary growth in plants is not correct?
A. Secondary growth in plants is a result of lateral meristems. Trees and shrubs have active lateral meristems. B. Secondary growth in plants increases the girth (diameter) of woody plants. C. Secondary growth in woody plants results from two cylinders of actively dividing cells, the cork cambium and vascular cambium. D. The cork cambium produces secondary phloem while the vascular cambium produces secondary xylem. E. Only some plants have secondary growth.
Mangrove plants live in areas regularly flooded with salt water. Which of these is not a possible mechanism for controlling their salt balance?
A. The roots block salt uptake. B. The succulent leaves contain large quantities of water that dilute salt that is absorbed. C. Absorbed salt is secreted from special salt glands. D. Modified roots emerge above the water level and help oxygen diffuse into the roots. E. Excess salt is stored in special tissues.
Where is the apical foramen of the developing tooth?
A. At the root of the tooth; The blood vessels and nerves enter the pulp here. B. Between adjacent developing teeth; The apical foramen is the gap between adjacent teeth. C. Between the developing tooth and the oral cavity: The apical foramen is the hole through which the tooth will emerge. D. Between the growing mass of dentin and odontoblasts; Dentin is secreted into this foramen by odontoblasts. E. Surrounding it; The apical foramen is the cavity in which the tooth develops.
Discuss the advantages of a closed circulatory system, compared to an open circulatory system
What will be an ideal response?