Which of the following are the water-conducting cells of xylem, have thick walls, and are dead at functional maturity?
a) clerenchyma cells
b) sieve-tube elements
c) collenchyma cells
d) tracheids and vessel elements
e) parenchyma cells
Ans: d) tracheids and vessel elements
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What is the role of monoamine oxidase and acetylcholinesterase in the nervous system?
a. To produce neurotransmitter molecules. b. To serve as receptors for neurotransmitter molecules. c. To breakdown neurotransmitter molecules.
In the process of nitrogen fixation, if you start with 5 molecules of N2, you will need _____ hydrogen atoms and _____ ATP molecules to make _____ molecules of ammonia.
A. 15; 16; 5 B. 15; 80; 10 C. 30; 80; 10 D. 30; 80; 5
The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the _______.
A. small intestine B. pancreas C. liver D. kidney E. large intestine
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What will be an ideal response?