What fraction of the nucleotides in a double-stranded DNA molecule are cytosine and thymine (% C and % T added together)?
A) 25 %
B) 50 %
C) 75 %
D) 100%
E) It depends on the DNA sequence
B
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Cellulose is ____
a. the most complex of the organic compounds b. a polymer of glucose and fructose c. a polymer of glucose and galactose d. a component of plasma membranes e. a material found in plant cell walls
The current mass extinction is said to be 100 to 1000 times above the background extinction rate
What does this mean? What will be an ideal response?
Match the numbered terms to the descriptions that follow. For each item, choose all appropriate terms, but only appropriate terms.
1. autotroph 2. heterotroph 3. phototroph 4. chemotroph an organism that obtains its energy from chemicals a) 3 only b) 1 and 4 c) 1 only d) 4 only e) 2 only
Most of the lymph fluid is returned to the bloodstream through the thoracic duct to the
A. left atrium of the heart. B. right atrium of the heart. C. right ventricle of the heart. D. left subclavian vein. E. right subclavian vein.