Fungal cell walls consist primarily of ____

a. cellulose
b. lignin
c. chitin


d. pectin
e. protein


ANSWER: c

Biology & Microbiology

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Radiolarians have frothy vacuoles and lipid droplets, which provide them with buoyancy in marine environments

Indicate whether the statement is true or false.

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A neuron sends information across a chemical synapse by

a. movement of sodium ions from the first cell through the membrane of the second. b. electrons from the first cell that induce permeability changes in the second. c. neurotransmitter molecules that penetrate into the second cell. d. fusion of the plasma membrane of the first cell with the membrane of the second. e. neurotransmitter molecules that bind to membrane receptors on the second cell.

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Facilitated diffusion requires a specific transporter for a specific molecule

a. true b. false

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Ecosystem diagrams help us visualize the flow of ___________.

A. matter and energy B. rivers and streams C. seasonal change D. happiness E. goods and services

Biology & Microbiology