The organisms most similar to mitochondria are
a. progenotes.
b. -proteobacteria.
c. cyanobacteria.
d. purple sulfur bacteria.
Ans: b. -proteobacteria.
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Which of the following characteristics indicates that Tiktaalik was an intermediate form between fish and amphibian?
a. The fossil reveals the presence of true lungs, with no gills present. b. Evidence suggests that the eyes were forward facing, similar to a terrestrial predator. c. The attachment of the fin bones to the shoulder suggest that they might be weight bearing. d. The DNA evidence shows that Tiktaalikâs enzymes were adapted for terrestrial habitats.
Each day, a bean plant holds its leaves horizontally during the day but folds them close to its stem at night. This is an example of:
a. photoperiodism b. vernalization c. circadian rhythm d. phytochromatic pattern e. systemic acquired rhythm
Refer to the accompanying figure. What structure is designated by label B?
a. activation gate b. inactivation gate c. modulatory sensor d. transport pump e. transport sensor
A large organic molecule that contains repeating subunits is called a _____.
A) monomer B) polymer C) steroid D) simple sugar