Plasmodesmata are ____
a. used in energy transformations within the cell
b. typical of animal cells more than plant cells
c. arrays of adhesion proteins that join epithelial cells and collectively prevent fluids from leaking between them
d. open channels that extend across plant cell walls to connect the cytoplasm of adjacent cells
e. complex mixture of extracellular cell secretions
d
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How do epithelial cells obtain their nutrients? a. Direct blood supply from an artery
b. Nutrients are delivered by macrophages. c. Direct blood supply from a vein. d. Diffusion from adjacent cells. e. Osmosis of nutrients from underlying tissue.
Which is a byproduct of photosynthesis?
a. water b. light c. glucose d. oxygen e. carbon dioxide
Why do food chains rarely have more than three or four links?
What will be an ideal response?
An inorganic ion that binds to an enzyme to help it function is called a
a. vitamin. b. cofactor. c. coenzyme. d. facilitator.