The first O2 producing organisms were probably
a. cyanobacteria.
b. Archaea.
c. green algae.
d. red algae.
e. plants.
a
Biology & Microbiology
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Of the following cells, which are most sensitive to reduced O2 levels?
a. heart cells b. kidney cells c. liver cells d. brain cells e. pancreatic cells
Biology & Microbiology
Photosynthesis in the ocean takes place mostly in the mesopelagic zone
Indicate whether the statement is true or false
Biology & Microbiology
Cilia are:
A) the cytoplasmic extensions or false feet that some cell types use for locomotion. B) many short, hair-like cellular extensions that beat to produce movement. C) the circular chromosomes of bacteria. D) different kinds of cells, each designed to perform a different function.
Biology & Microbiology
Pollen grains contain:
A) sperm. B) eggs. C) spores. D) wings.
Biology & Microbiology