Which of the following provides support for the endosymbiotic theory?
A. Mitochondria and chloroplasts have only a single membrane surrounding them.
B. Mitochondria and chloroplasts contain genes that are vastly different compared to bacterial genes.
C. Mitochondria and chloroplasts have their own genomes.
D. Mitochondria and chloroplasts cannot synthesize proteins.
E. Mitochondria and chloroplasts contribute to similar metabolic processes in the eukaryotic cell.
Answer: C
You might also like to view...
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the results of the Luria Delbruck fluctuation experiment indicate?
A) All bacteria are naturally resistant to infection by phage. B) Some individuals in any bacterial population are resistant to infection by phage. C) Exposure to phage induces some bacteria to mutate and become resistant to phage. D) Resistance to phage in bacteria is caused by random spontaneous mutation. E) Some phage mutated to produce large plaques with sharp edges.
Respond to statements 117–121 in reference to the five items
listed below. a. antigens b. antibodies c. helper T cells d. cytotoxic T cells e. effector B cells E 117. These bind, as in a lock-and-key mechanism, to foreign proteins. D 118. These produce immunoglobulins in response to the reinvasion by a virus. D 119. These directly attack the foreign cells of an incompatible skin graft. M 120. An Rh+ molecule in the body of an Rh woman is an example of these. D 121. Proteins produced by these attack bacteria and viruses in the blood.
Which of the following best explains why machines can never be 100% efficient?
a. the tendency of energy not to spread out b. the tendency of energy to spread out c. the tendency of energy to be kept d. the tendency of energy to be lost
Which zone is inhabited by bottom-feeding catfish, crayfish, aquatic worms, clams, and bacteria?
A) Limnetic B) Benthic C) Pelagic D) Profundal E) Intertidal