Mitochondria differ from chloroplasts in that mitochondria
A) convert light energy from the sun to chemical energy, whereas chloroplasts convert one form of chemical energy to another.
B) contain three different membrane-bound compartments, whereas chloroplasts contain two.
C) contain membrane folds called cristae, whereas chloroplasts contain disklike vesicles in stacks called grana.
D) are not found in plants, whereas chloroplasts are not found in animals.
Answer: C
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Volcanic activity on early Earth was responsible for the release of ____
a. gases for the early atmosphere b. oxygen for photosynthesis c. water vapor necessary to form the first oceans d. gases for the early atmosphere and oxygen for photosynthesis e. gases for the early atmosphere and water vapor necessary to form the first oceans
New polypeptide chains for proteins are assembled on
a. Golgi bodies. b. lysosomes. c. ribosomes. d. peroxisomes. e. centrosomes
The second law of thermodynamics is valid only in a closed system, such as a living organism
Indicate whether the statement is true or false
Why is insulin produced by genetically engineered E. coli cells superior to insulin obtained from
animal sources? a. Animal insulin has a shorter life span than insulin produced using recombinant DNA techniques. b. It contains human rather than animal sequences, reducing the chances of an allergic response. c. Animal insulin is more difficult to purify than is recombinantly produced insulin. d. Recombinantly produced insulin has a much higher activity level. e. Recombinantly produced insulin is easier to obtain than insulin from animals.