For multicellularity to develop, there must be a mechanism of communication among cells in the multicellular organism. Which of the following structures present in the cell membrane receives signals from the environment?
A. plasmodesmata
B. receptors
C. gap junctions
D. cadherins
B
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Cholesterol is a structural component of cell membranes. Amount of cholesterol present can affect membrane stability and permeability. What is the role of cholesterol in a membrane? A. A membrane that needs to be more rigid and more permeable, would have high cholesterol ratios. B. A membrane that needs to be rigid, such as a protective barrier, would have low cholesterol ratios. C
Membranes with low amounts of cholesterol are very stable and have increased permeability. D. Membranes with high amounts of cholesterol are very stable and have decreased permeability.
Which of the following structures constitute the carpel of a flower? Select all correct choices
A. ovary B. anther C. style D. stigma E. stamen
A vein always carries:a
blood to the heart. b. blood from the heart. c. oxygen-rich blood. d. oxygen-poor blood. e. blood rich in carbon dioxide.
Which of these biomes has a plant composition that is most similar to the temperate coniferous forest?
A. alpine B. taiga C. deciduous forest D. rain forest E. chaparral