Which of the following are not present in plant cells?
a. endoplasmic reticulum
b. Golgi complex
c. lysosomes
d. mitochondria
C
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How does phosphorus enter the biological portion of the cycle?
a. Land plants take up dissolved phosphate from the soil water. b. Bacteria fix phosphate from the atmosphere. c. Consumers eat phosphate containing soil. d. Bacteria fix phosphate from water. e. Erosion of rocks moves phosphate into water, which consumers drink.
Abscission of fruits and leaves is controlled by
a. abscisic acid. b. ethylene. c. gibberellin. d. auxin. e. cytokinin
Red algae can survive in deeper water because
of
a. phycobilins. b. holdfasts. c. chlorophyll a. d. a stonelike cell wall. e. their preference for freshwater habitat.
Mature bone cells in lacunae that no longer divide. Maintain bone matrix and act as stress or strain sensors. Respond to mechanical stimuli such as increased force on bone or weightlessness. Communicate information to osteoblasts and osteoclasts (cells that destroy bone) so bone remodeling can occur.
What will be an ideal response?