Describe the supporting evidence for the endosymbiotic theory
What will be an ideal response?
There are two lines of evidence that directly support the endosymbiotic theory. Firstly, the DNA in
both mitochondria and chloroplasts is arranged in a circular molecule, just as is observed in
prokaryotic genomes. Secondly, phagocytized cells and organelles have been directly observed
surviving inside the phagocytic cell. In addition to the direct evidence, the development of a symbiotic
relationship would have benefited both participants. Over time, it would make sense for some of the
DNA to be transferred to the host cell's genome so that is was under the control of the host cell. This
process would have led to the development of the chloroplasts and mitochondria present in cells today.
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What is common to all of the oxidation reactions in the Krebs cycle?
A. They all lead to the generation of NADH. B. They are all decarboxylation reactions. C. They are all characterized by a loss of electrons from an organic molecule coupled to the reduction of an electron acceptor. D. They all lead to substrate-level phosphorylation of ADP to generate ATP.
What is the difference between an estuary and a salt marsh?
a. Salt marshes are found far from the ocean, while estuaries border the ocean. b. Salt marshes are not affected by tides, while estuaries are. c. Salt marshes are dominated by grasses, while estuaries are defined by tidal influence. d. Salt marshes border the ocean, while estuaries exist in river environments. e. Salt marshes are affected by tides, while estuaries are not.
When geese or ducks are imprinted, this means that they ____
a. will return to the place they were born to breed and raise their own young b. have become habituated to harmless stimuli c. have been experimentally trained by operant conditioning d. learned the features of a suitable mate during a critical period e. have two nonfunctional copies of a particular gene
A human cell with a Barr body always comes from a female.
Answer the following statement true (T) or false (F)