The endosymbiotic theory suggests that chloroplasts evolved from cyanobacteria. What features of cyanobacteria support this premise?
What will be an ideal response?
There are many similarities between cyanobacteria and eukaryotic chloroplasts. Cyanobacteria are photosynthetic. Chloroplasts are the membrane-bound organelles in some eukaryotes where photosynthesis takes place. Chloroplasts have an outer and an inner membrane. The inner membrane, or thylakoid membrane, forms stacks of thylakoid discs called grana, where part of eukaryotic photosynthesis takes place. Cyanobacteria also have a system of inner membranes called thylakoids where photosynthesis takes place. Chloroplasts contain a single, circular piece of DNA in the stroma, and the genome of a cyanobacterium is a single, circular chromosome. These and other characteristics support the endosymbiotic theory.
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The bond in table salt (NaCl) is
a. polar. b. ionic. c. covalent. d. double. e. nonpolar
Glial cells support and nourish neurons
____________________ Indicate whether the statement is true or false.
DNA is a double helix, with a structure much like a twisted ladder. What forms the "rungs" of the ladder?
What will be an ideal response?
The electron transport chain provides the energy for
A) oxidative phosphorylation. B) substrate-level phosphorylation. C) beta-oxidation. D) photophosphorylation. E) anabolic reactions.