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

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Photosynthesis in the ocean takes place mostly in the mesopelagic zone

Indicate whether the statement is true or false

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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.

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Pollen grains contain:

A) sperm. B) eggs. C) spores. D) wings.

Biology & Microbiology