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21. The difference between autotroph and heterotroph is that
a. heterotrophs must get energy from sources other than the sun
b. heterotrophs can use chemical or light energy sources
c. heterotrophs do not obtain energy from autotrophs
d. all of the above

25. Which of the following is NOT true for the cellular respiration process?
a. The total amount of ATP that a cell gains for each glucose molecule that enters glycolysis depends on the presence of carbon dioxide
b. Pyruvate produced during glycolysis enters a mitochondrian during the second stage of cellular respiration
c. The final electron acceptor in aerobic respiration is oxygen
d. Acetyl-CoA combines with a four-carbon molecule

28. The structure of chromosomes is best explained as DNA
a. broken apart into separate genes
b. extended to form very long, thin molecules
c. wrapped tightly around associated proteins
d. coiled up into a ball
I'm stuck between C and D

29. A normal, healthy human offspring develops when
a. an X chromosome is donated by each parent
b. a change in the chromosome number occurs
c. the structure of a chromosome is changed by mutation
d. none of the above


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